ext/hyperframes
2
0
Fork 0
mirror of https://github.com/heygen-com/hyperframes.git synced 2026-09-01 19:42:03 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
main
hyperframes/docs/catalog/components/camera-shake.mdx
T
Miguel ÁngelandMiguel Angel Simon Sierra 1ae2067b8d feat(catalog): put the variables panel back, on payloads (#3199) 
* feat(catalog): put the variables panel back, on payloads

The panel drove its preview by loading an .html from docs/public, a type the
host does not publish, so it showed an empty frame in production and was
parked when the catalog was re-landed.

It now mounts the same JSON payload the plain player uses and re-mounts it as
values change, injecting them as window.__hfVariables into the composition head
before any of its scripts run, which is where the runtime reads overrides from.
Doing it in the markup rather than after load is what stops the composition
initialising with the wrong values first.

172 items with variables get the panel back; the playhead carries across a
change so a tweak mid-shot does not jump back to frame zero.

* fix(docs): drop the unused url form and the needless escapes

* fix(docs): the panel cannot reference a binding beside the export

* feat(catalog): make importing an SVG the obvious move

A reader arrives at this control with a shape, not with path data, and the
panel asked for the coordinates first. Import is now the primary action in a
drop target you can see is a drop target, and the raw path sits behind a
disclosure for anyone who wants it.

* feat(cli): let a fruitless catalog search report the gap

An agent that searches by meaning and finds nothing worth installing knows
something we do not: the name of a move the catalog is missing. There was no
way to tell us, so that knowledge was lost at the end of every run.

hyperframes feedback --search-miss "<query>" --wanted "<the move>" records it.
It carries no rating, so it never lands in the rating metric, and it is a
separate deliberate command rather than something catalog --query does on its
own: plain search still sends nothing, which is what the CLI promises.

--rating stops being required at the arg level, since a miss has no rating to
give. The check moved into the run body, where an absent one is now handled
rather than crashing on undefined.

* feat(cli): carry tuned variable values into the install snippet

Someone who tunes a block on its catalog page had no way to keep those values:
the install command was the same one everybody gets, and the tuning stayed on
the page.

hyperframes add <item> --vars '<json>' now prints a mount element carrying
data-variable-values, so the values land where the block is used.

They ride on the host rather than being written into the installed file. That
keeps the composition on disk byte-identical to the registry's, so a later
reinstall can still tell an edit from an update, and it lets two mounts of the
same block carry different values.

* fix(catalog): serve the item's own directory so runtime paths resolve

Some compositions assemble their asset URLs at run time —
"compositions/components/" + texture + ".png" for the texture masks, a font the
compiler pulled into _remote_media — and no scan of the markup can see a string
that does not exist until a script concatenates it. Those items either rendered
black or were dropped to a video that had never been uploaded.

Each item that needs it now has its prepared directory published, and its
payload carries a <base> pointing at it, so any relative path the composition
invents resolves. caption-texture renders its masks again, and
variable-font-flex has a preview at all for the first time: its MP4 and poster
are both 403.

Both layouts are published, because which one a composition asks for differs
per item, and a directory only earns that if it is under 2 MB. The 12 MB
texture sheet keeps the recorded video it already had.

* fix(catalog): let the variables panel actually drive the composition

Every control on the panel was inert. The values reached the composition and
nothing repainted, because the payload had already been compiled: compiling
inlines a mounted component and resolves its variables into the markup and CSS,
so by the time a reader turns a knob there is nothing left to change.

An item that declares variables now ships uncompiled, keeping the mount the
runtime loads at run time, which is the only state where data-variable-values
still means anything. The component travels inline as a data URI rather than a
sibling file, because .html is the one type the docs host will not publish. The
demo's own pinned values come off, so the reader's choices reach the mount
instead of losing to the values the demo picked to show itself off.

Measured on the rendered frame rather than the DOM: green rgb(98,207,144),
blue rgb(6,6,199), violet rgb(177,147,230), and back to green.

docs/public/catalog drops from 48 MB to 35 MB along the way, since an
uncompiled payload carries far less than an inlined one.

* feat(catalog): keep variable changes in the url

A reader who tuned a piece lost it on reload, and had nothing to send anyone.
The values now live in the query string, scoped by composition id so two links
never read each other,and only the ones that differ from the defaults are
written, so changing one knob gives a short URL rather than every variable
spelled out.

replaceState rather than pushState: dragging a slider should not leave a trail
of history entries. An unreadable value is ignored rather than thrown, so a
truncated or hand-edited link opens the piece at its defaults.

* fix(catalog): only rewrite the url when a value actually changed

* refactor(catalog): memoise the declared defaults on their content

* feat(catalog): offer an install command carrying the tuned values

The Install block is generated before anyone touches a knob, so it can only
ever print the plain command. Someone who spent a minute tuning a piece copied
it and got the defaults back.

The panel now carries its own command in the Snippet tab, with --vars holding
exactly the values that differ. An untouched piece still offers the same short
command, so nothing gets noisier for the common case.

* fix(catalog): a piece with nothing to render is a skip, not a failure

caption-blend-difference is a stylesheet and a paragraph of prose — a class you
add to your own captions, with no standalone scene to show. The generator
treated that as a build failure, so every run ended by reporting something
broken when nothing was.

It now reports the shape it is and keeps its recorded video, which is the only
honest preview such an item has. A genuine render failure still throws.

* fix(catalog): restore variables from the url on a cold load

A shared link opened at the defaults. The first render happens on the server,
where there is no window to read the query string from, and React then hydrates
against that markup and never revisits it — so the values only appeared once you
touched a control.

The URL is read again after mount, which is the first moment it exists. The
value is also escaped once now rather than twice: URLSearchParams already
decodes on the way out, and decoding a second time turned an SVG path full of
percent-escapes into something that no longer parsed, besides doubling the
length of every link.

* fix(catalog): mount the preview with the values a link carried

The frame was built from the declared defaults and the shared values were
posted to it afterwards, which is too late for anything the composition reads
once at init: a path arrived after the mark had already been drawn from the
default one, so a link looked right in the panel and wrong on screen.

* feat(catalog): the install command follows the values you tuned

Copying the Install line gave the plain command back, because that block is
generated before anyone touches a knob and had no way to know what changed. The
tuned command only existed in the panel Snippet tab, which is not where anyone
looks for it.

The line now reads the same query string the panel writes, so the two agree
without either component knowing the other exists, and a shared link carries the
right command too. replaceState fires no event, so the panel announces its own
writes.

* fix(catalog): send a text variable to the preview once it is finished

Every other control in the explorer reports a whole value on every event: a
slider at any position is a position, a swatch is a colour. A text field is
not. Typing v3 into a badge posted v first, so the preview remounted and
rendered a composition built from half a word.

The post now waits while a text field has focus and goes out when the edit is
committed, with Enter or by clicking away. The field itself is unchanged and
still tracks every keystroke.

---------

Co-authored-by: Miguel Angel Simon Sierra <miguelangelsi07@gmail.com>
2026-08-10 22:40:01 -04:00

1693 lines
62 KiB
Plaintext
Raw Permalink Blame History

---
title: "Camera Shake"
description: "Procedural handheld, telephoto and rig camera shake for any wrapper: nine measured profiles with per-lens projection, closed-form and seek-safe"
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
<VariablesExplorer
previewSrc="/public/catalog/components/camera-shake.json"
compositionId="camera-shake"
compositionSrc="compositions/components/camera-shake.html"
variables={[{"id":"shakeProfile","type":"enum","label":"Shake profile","default":"handheld-normal-mild","options":[{"value":"handheld-normal-mild","label":"Handheld - normal lens, mild"},{"value":"handheld-normal-strong","label":"Handheld - normal lens, strong"},{"value":"handheld-normal-extreme","label":"Handheld - normal lens, extreme"},{"value":"handheld-wideangle-mild","label":"Handheld - wide angle, mild"},{"value":"handheld-wideangle-strong","label":"Handheld - wide angle, strong"},{"value":"handheld-tele-mild","label":"Handheld - telephoto, mild"},{"value":"handheld-tele-strong","label":"Handheld - telephoto, strong"},{"value":"rig-6d-shake","label":"Rig - 6D shake (engine buzz)"},{"value":"rig-6d-wobble","label":"Rig - 6D wobble"}]},{"id":"shakeIntensity","type":"number","label":"Intensity multiplier","default":1,"min":0,"max":3,"step":0.05},{"id":"shakeFrequency","type":"number","label":"Frequency multiplier","default":1,"min":0.1,"max":4,"step":0.05},{"id":"shakeRotation","type":"boolean","label":"Include rotation (roll + tilt/pan)","default":true}]}
>
```html camera-shake.html
<!doctype html>
<html
lang="en"
data-composition-variables='[
{
"id": "shakeProfile",
"type": "enum",
"label": "Shake profile",
"default": "handheld-normal-mild",
"options": [
{ "value": "handheld-normal-mild", "label": "Handheld - normal lens, mild" },
{ "value": "handheld-normal-strong", "label": "Handheld - normal lens, strong" },
{ "value": "handheld-normal-extreme", "label": "Handheld - normal lens, extreme" },
{ "value": "handheld-wideangle-mild", "label": "Handheld - wide angle, mild" },
{ "value": "handheld-wideangle-strong", "label": "Handheld - wide angle, strong" },
{ "value": "handheld-tele-mild", "label": "Handheld - telephoto, mild" },
{ "value": "handheld-tele-strong", "label": "Handheld - telephoto, strong" },
{ "value": "rig-6d-shake", "label": "Rig - 6D shake (engine buzz)" },
{ "value": "rig-6d-wobble", "label": "Rig - 6D wobble" }
]
},
{
"id": "shakeIntensity",
"type": "number",
"label": "Intensity multiplier",
"default": 1,
"min": 0,
"max": 3,
"step": 0.05
},
{
"id": "shakeFrequency",
"type": "number",
"label": "Frequency multiplier",
"default": 1,
"min": 0.1,
"max": 4,
"step": 0.05
},
{
"id": "shakeRotation",
"type": "boolean",
"label": "Include rotation (roll + tilt/pan)",
"default": true
}
]'
>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Camera Shake</title>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<style>
*,
*::before,
*::after {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
width: 1920px;
height: 1080px;
overflow: hidden;
background: transparent;
}
/* ---- camera-shake ----------------------------------------------------
Procedural handheld / Steadicam / rig shake for ANY wrapper. Two
elements: an overflow-hidden FRAME that carries the lens perspective,
and a RIG inside it that gets the shake transform. Whatever you put
in the rig becomes "the shot".
<div class="camera-shake-frame">
<div class="camera-shake-rig"> ...your content... </div>
</div>
cameraShake(tl, "#my-rig", { profile: "handheld-tele-mild", duration: 8 });
Layers inside the rig may carry data-cs-z="-800" to sit at a depth;
cameraShake() scales them to compensate so they parallax under the
camera instead of sliding as a flat card.
------------------------------------------------------------------- */
.camera-shake-frame {
position: absolute;
inset: 0;
overflow: hidden;
/* perspective is written by cameraShake() from the profile's lens */
}
.camera-shake-rig {
position: absolute;
inset: 0;
transform-style: preserve-3d;
will-change: transform;
}
.camera-shake-rig > * {
transform-style: preserve-3d;
}
/* ---- self-preview stand-in "world" (not part of the snippet) ------- */
.cs-layer {
position: absolute;
inset: 0;
}
.cs-sky {
background: linear-gradient(#070b18 0%, #16264a 52%, #4a6ea8 78%, #b9852f 100%);
}
.cs-skyline {
position: absolute;
left: 0;
right: 0;
bottom: 46%;
height: 220px;
background: repeating-linear-gradient(
90deg,
#0d1428 0 70px,
transparent 70px 96px,
#101a33 96px 140px,
transparent 140px 178px
);
opacity: 0.85;
}
.cs-tower {
position: absolute;
bottom: 44%;
width: 190px;
background: linear-gradient(#1d2b4d, #0a1024);
border-top: 6px solid #2f4a80;
}
.cs-tower::after {
content: "";
position: absolute;
inset: 18px 14px;
background:
repeating-linear-gradient(0deg, #ffd48a33 0 10px, transparent 10px 34px),
repeating-linear-gradient(90deg, #ffd48a2b 0 12px, transparent 12px 40px);
}
.cs-t1 {
left: 300px;
height: 430px;
}
.cs-t2 {
left: 820px;
width: 260px;
height: 640px;
}
.cs-t3 {
left: 1340px;
height: 380px;
}
/* Flat ground plane. A rotateX'd floor would poke through the title
plane under preserve-3d, so depth here comes from translateZ only. */
.cs-floor {
position: absolute;
left: 0;
right: 0;
top: 56%;
bottom: 0;
background:
repeating-linear-gradient(90deg, #4d6ea03d 0 3px, transparent 3px 150px),
repeating-linear-gradient(0deg, #4d6ea03d 0 3px, transparent 3px 70px),
linear-gradient(#0a1224, #04070f);
}
.cs-title {
position: absolute;
left: 0;
right: 0;
top: 300px;
text-align: center;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-weight: 800;
font-size: 148px;
line-height: 1.1;
letter-spacing: -0.03em;
color: #ffffff;
text-shadow: 0 12px 44px rgba(0, 0, 0, 0.75);
}
.cs-title span {
display: block;
}
.cs-post {
position: absolute;
left: 120px;
bottom: 0;
width: 46px;
height: 620px;
background: linear-gradient(#25324f, #060a14);
border-radius: 6px;
}
.cs-post-b {
left: auto;
right: 150px;
height: 720px;
}
/* ---- static frame guide: proves the WORLD moves, not the frame ----- */
#cs-guide {
position: absolute;
inset: 0;
pointer-events: none;
}
/* Thirds as four thin bars, not one full-frame gradient layer: a
full-inset element over the title reads as an occluder to the
layout checker even when its paint is mostly transparent. */
#cs-guide .cs-line {
position: absolute;
background: rgba(255, 255, 255, 0.25);
}
#cs-guide .cs-v1 {
left: 639px;
top: 0;
width: 3px;
height: 1080px;
}
#cs-guide .cs-v2 {
left: 1279px;
top: 0;
width: 3px;
height: 1080px;
}
#cs-guide .cs-h1 {
left: 0;
top: 359px;
width: 1920px;
height: 3px;
}
#cs-guide .cs-h2 {
left: 0;
top: 719px;
width: 1920px;
height: 3px;
}
#cs-guide .cs-reticle {
position: absolute;
left: 910px;
top: 490px;
width: 100px;
height: 100px;
border: 3px solid #ff4d3d;
border-radius: 50%;
}
#cs-guide .cs-reticle::after {
content: "";
position: absolute;
left: 47px;
top: -40px;
width: 3px;
height: 180px;
background: #ff4d3d;
}
#cs-guide .cs-tick {
position: absolute;
width: 70px;
height: 70px;
border: 4px solid #ffffffbb;
}
#cs-guide .cs-tl {
left: 70px;
top: 70px;
border-right: 0;
border-bottom: 0;
}
#cs-guide .cs-tr {
right: 70px;
top: 70px;
border-left: 0;
border-bottom: 0;
}
#cs-guide .cs-bl {
left: 70px;
bottom: 70px;
border-right: 0;
border-top: 0;
}
#cs-guide .cs-br {
right: 70px;
bottom: 70px;
border-left: 0;
border-top: 0;
}
#cs-readout {
position: absolute;
left: 70px;
bottom: 170px;
font-family: Menlo, Consolas, monospace;
font-size: 30px;
letter-spacing: 0.02em;
color: #ffffffe6;
text-shadow: 0 2px 10px rgba(0, 0, 0, 0.9);
}
</style>
</head>
<body>
<!--
WIRING (what you copy into a host composition):
1. the .camera-shake-frame / .camera-shake-rig CSS above
2. the cameraShake() helper in the script below (profile table included)
3. wrap the thing you want shot:
<div class="camera-shake-frame">
<div class="camera-shake-rig" id="shot"> <video .../> </div>
</div>
4. drive it from your paused timeline:
cameraShake(tl, "#shot", { profile: "handheld-wideangle-strong", duration: 8 });
Everything with a `cs-` class below is the self-preview world, not the snippet.
-->
<div
id="cs-root"
data-composition-id="camera-shake"
data-start="0"
data-duration="6"
data-fps="30"
data-width="1920"
data-height="1080"
style="position: relative; width: 1920px; height: 1080px; background: #05070f"
>
<div
class="camera-shake-frame clip"
id="cs-frame"
data-start="0"
data-duration="6"
data-track-index="0"
>
<!-- The rig is deliberately larger than the frame (overscan) and
deliberately leaves it under shake: that IS the effect, so every
moving layer is marked as intentional overflow. -->
<div class="camera-shake-rig" id="cs-rig" data-layout-allow-overflow>
<div class="cs-layer cs-sky" data-cs-z="-900" data-layout-allow-overflow></div>
<div class="cs-layer cs-farlayer" data-cs-z="-520" data-layout-allow-overflow>
<div class="cs-skyline" data-layout-allow-overflow></div>
</div>
<div class="cs-layer cs-midlayer" data-cs-z="-240" data-layout-allow-overflow>
<div class="cs-tower cs-t1" data-layout-allow-overflow></div>
<div class="cs-tower cs-t2" data-layout-allow-overflow></div>
<div class="cs-tower cs-t3" data-layout-allow-overflow></div>
</div>
<div class="cs-layer cs-floorlayer" data-cs-z="-90" data-layout-allow-overflow>
<div class="cs-floor" data-layout-allow-overflow></div>
</div>
<div class="cs-layer cs-titlelayer" data-cs-z="0" data-layout-allow-overflow>
<div class="cs-title">
<span>CAMERA</span>
<span>SHAKE</span>
</div>
</div>
<div class="cs-layer cs-nearlayer" data-cs-z="110" data-layout-allow-overflow>
<div class="cs-post" data-layout-allow-overflow></div>
<div class="cs-post cs-post-b" data-layout-allow-overflow></div>
</div>
</div>
</div>
<div id="cs-guide" class="clip" data-start="0" data-duration="6" data-track-index="1">
<div class="cs-line cs-v1"></div>
<div class="cs-line cs-v2"></div>
<div class="cs-line cs-h1"></div>
<div class="cs-line cs-h2"></div>
<div class="cs-tick cs-tl"></div>
<div class="cs-tick cs-tr"></div>
<div class="cs-tick cs-bl"></div>
<div class="cs-tick cs-br"></div>
<div class="cs-reticle"></div>
<div id="cs-readout">profile</div>
</div>
</div>
<script>
/* =====================================================================
camera-shake - procedural handheld / Steadicam / rig camera shake.
PROVENANCE + LICENCE. The nine profiles below are measured PARAMETER
VALUES (amplitudes in degrees, frequencies in Hz, three octaves per
axis) read off Unity Cinemachine's shipped noise presets. Cinemachine
is under the Unity Companion License, which is NOT permissive: no
Unity file is vendored, copied or imported here, and none of the code
below derives from Unity source. What is reused is the numeric data -
facts about how much a camera moves - plus a three-line sampler shape
that is standard mathematics (sum of octaves of noise / cosine). The
noise function, the screen-space projection, the lens model, the
overscan solver and the seek-safe driver are all original.
DETERMINISM. Every value is a closed-form function of `t`:
channel(t) = (valueNoise(freq*t + offset) - 0.5) * amplitude
channel(t) = cos((freq*t + offset) * 2PI) * amplitude * 0.5
No accumulator, no dt, no clock, no unseeded random. Seeking straight
to frame N produces exactly the same state as stepping to frame N.
The per-frame work is driven from a PROPERTY SETTER on a tweened
driver object - NOT from tl.eventCallback("onUpdate"), which GSAP
suppresses on seek() and which would freeze the shake on frame 0.
===================================================================== */
(function () {
window.__timelines = window.__timelines || {};
var RAD = Math.PI / 180;
/* ---- the nine profiles ------------------------------------------
rot[octave] = [ [ampXdeg, freqHz], [ampY, freq], [ampZ, freq] ]
null = the preset has no channel on that axis for that octave.
`lens` selects the focal length used for the screen projection.
The optical truth in this table: wide-angle carries 12 deg on X
where telephoto carries 4 deg, because a long lens magnifies
angular jitter - amplitude scales inversely with focal length.
Keep the 3x ratio; it is the whole reason there are lens variants.
------------------------------------------------------------------ */
var CS_PROFILES = {
"handheld-normal-mild": {
lens: "normal",
rot: [
[[7, 0.15], [5, 0.1], null],
[[4, 0.8], [2, 0.75], null],
[[1, 1.2], [0.8, 1.5], null],
],
},
"handheld-normal-strong": {
lens: "normal",
rot: [
[[10, 0.4], [10, 0.06], null],
[[5, 1.44], [3, 0.73], null],
[[3, 2.49], [1, 2.0], null],
],
},
"handheld-normal-extreme": {
lens: "normal",
rot: [
[[15, 0.2], [7, 0.25], null],
[[5, 0.9], [3, 1.0], null],
[[2, 2.0], null, null],
],
},
"handheld-wideangle-mild": {
lens: "wide",
rot: [
[[12, 0.15], [5, 0.1], null],
[[5, 0.6], [4, 0.45], null],
[[1, 1.5], [1, 1.2], null],
],
},
"handheld-wideangle-strong": {
lens: "wide",
rot: [
[[17.46, 0.5], [5, 0.25], null],
[
[12.47, 0.94],
[4, 0.5],
[1, 0.4],
],
[[4, 1.2], [2, 1.3], null],
],
},
"handheld-tele-mild": {
lens: "tele",
rot: [
[[4, 0.2], [2, 0.15], null],
[[2, 0.4], [2, 0.5], null],
[[1, 0.7], [1, 0.6], null],
],
},
"handheld-tele-strong": {
lens: "tele",
rot: [
[
[6.19, 0.39],
[4, 0.15],
[1, 0.1],
],
[[1.84, 1.75], [0.5, 0.9], null],
[[2.3, 2.0], [0.5, 1.4], null],
],
},
/* 6D Shake also carries POSITION channels (Unity world units, not
degrees). Every position channel is a "constant" (cosine) channel
except octave-2 Y, which is noise - that asymmetry is in the
measured data and is kept. */
"rig-6d-shake": {
lens: "normal",
rot: [
[
[0.09, 5.83],
[0.059, 1.8],
[0.017, 2.38],
],
[
[0.14, 9.17],
[0.041, 11.35],
[0.009, 10.52],
],
[
[0.15, 57.17],
[0.048, 54.17],
[0.016, 63.76],
],
],
pos: [
[
[0.011, 3.2, 1],
[0.059, 1.9, 1],
[0.021, 3.33, 1],
],
[
[0.009, 7.7, 1],
[0.04, 9.1, 0],
[0.009, 9.22, 1],
],
[
[0.002, 51.51, 1],
[0.05, 55.54, 1],
[0.017, 58.55, 1],
],
],
},
"rig-6d-wobble": {
lens: "normal",
rot: [
[
[0.987, 5.2],
[1.34, 5.39],
[2, 2.23],
],
[
[0.73, 9.17],
[0.86, 11.35],
[0.51, 8.31],
],
[
[0.78, 13.52],
[0.55, 27.66],
[0.28, 18.91],
],
],
},
};
/* Lens -> pinhole projection distance, in pixels.
Two constraints, and they have to be satisfied together:
1) SCALE. These amplitudes were authored against a camera with a
60 degree VERTICAL field of view, so the "normal" lens must
reproduce that framing or every profile comes out roughly twice
as violent as intended: D_normal = (H/2) / tan(30deg).
2) RATIO. 28 / 50 / 85mm are the standard wide / normal / tele
primes; D scales with focal length, so wide:tele is 1:3.04 -
the exact reciprocal of the 12deg:4deg amplitude ratio in the
profile table. That reciprocal is why all seven handheld presets
land within ~15% of the same on-screen displacement while still
looking like completely different lenses. */
var CS_LENS_MM = { wide: 28, normal: 50, tele: 85 };
var CS_REF_VFOV_DEG = 60;
/* Unity position channels are world units with no pixel equivalent.
240 px/unit is AUTHORED (it puts 6D Shake's buzz at a few pixels,
which is what an engine-vibration preset should look like). It is
the one number here that is not measured. */
var CS_UNIT_PX = 240;
/* Tilting the content plate is a stand-in for rotating the camera, and
it degenerates. The plate is a finite rectangle sitting AT the
projection distance, so tipping it drives its far corner backwards
by (half-diagonal * sin tilt); once that approaches D the corner
crosses the eye plane, the projection blows up, and NO amount of
overscan covers the frame - increasing the scale only pushes the
corner further behind the eye. It bites first on wide lenses, where
D is small and the plate is optically enormous.
So the tilt ceiling is derived, not picked: allow the corner to sink
at most a quarter of the way to the eye. 28mm gets ~6.8 deg, 50mm
~12.3 deg, 85mm ~21.2 deg - wide lenses keystone least, which is
also what they look like. The FRAMING swing, which is what the
measured degrees actually encode, is never clamped: the shot still
moves by the full authored amount and only the world's keystone
stops growing. */
var CS_TILT_DEPTH_BUDGET = 0.25;
/* ---- deterministic 1-D value noise (original implementation) ------
Integer hash -> [0,1), smootherstep interpolation between lattice
points. Pure function of (x, seed): no state, no Math.random. */
function csHash(i, seed) {
var h = Math.imul(i | 0, 374761393) + Math.imul(seed | 0, 668265263);
h = (h ^ (h >>> 13)) >>> 0;
h = Math.imul(h, 1274126177) >>> 0;
return ((h ^ (h >>> 16)) >>> 0) / 4294967296;
}
function csNoise(x, seed) {
var i = Math.floor(x);
var f = x - i;
var u = f * f * f * (f * (f * 6 - 15) + 10);
return csHash(i, seed) * (1 - u) + csHash(i + 1, seed) * u;
}
/* One channel of one octave. `constant` picks the cosine form.
Each channel gets its own seed AND its own time offset: sharing
offsets correlates the axes and the shake collapses into a diagonal
line, which is the classic tell of fake handheld. */
function csChannel(amp, freq, t, seed, constant) {
var u = freq * t + seed * 7.13;
if (constant) return Math.cos(u * 2 * Math.PI) * amp * 0.5;
return (csNoise(u, seed) - 0.5) * amp;
}
function csSample(profile, t, intensity, freqScale) {
var rot = [0, 0, 0];
var pos = [0, 0, 0];
var o, a, ch;
for (o = 0; o < profile.rot.length; o++) {
for (a = 0; a < 3; a++) {
ch = profile.rot[o][a];
if (!ch) continue;
rot[a] += csChannel(ch[0] * intensity, ch[1] * freqScale, t, o * 3 + a, 0);
}
}
if (profile.pos) {
for (o = 0; o < profile.pos.length; o++) {
for (a = 0; a < 3; a++) {
ch = profile.pos[o][a];
if (!ch) continue;
pos[a] += csChannel(ch[0] * intensity, ch[1] * freqScale, t, 32 + o * 3 + a, ch[2]);
}
}
}
return { pitch: rot[0], yaw: rot[1], roll: rot[2], px: pos[0], py: pos[1], pz: pos[2] };
}
/* ---- the public helper ------------------------------------------
cameraShake(tl, target, opts)
profile one of the nine ids
intensity amplitude multiplier (default 1)
frequency frequency multiplier (default 1)
rotation false = translation only (gimbal-stabilised look)
duration seconds of shake (default 6)
at timeline position (default 0)
fps sampling rate for the overscan solve (default 30)
overscan force a scale instead of solving for one
Returns { distance, overscan, peakX, peakY, peakRoll }.
------------------------------------------------------------------ */
window.cameraShake = function (tl, target, opts) {
opts = opts || {};
var el = typeof target === "string" ? document.querySelector(target) : target;
if (!el) return null;
var profile = CS_PROFILES[opts.profile] || CS_PROFILES["handheld-normal-mild"];
var intensity = opts.intensity === undefined ? 1 : Number(opts.intensity);
var freqScale = opts.frequency === undefined ? 1 : Number(opts.frequency);
var withRotation = opts.rotation !== false;
var dur = opts.duration === undefined ? 6 : Number(opts.duration);
var at = opts.at === undefined ? 0 : Number(opts.at);
var fps = opts.fps === undefined ? 30 : Number(opts.fps);
var box = el.getBoundingClientRect();
var W = box.width || el.offsetWidth || 1920;
var H = box.height || el.offsetHeight || 1080;
var D = (H / 2 / Math.tan((CS_REF_VFOV_DEG / 2) * RAD)) * (CS_LENS_MM[profile.lens] / 50);
// The frame (overflow-hidden parent) carries the lens perspective so
// that depth layers inside the rig parallax instead of sliding flat.
var frame = el.parentElement;
if (frame) frame.style.perspective = D + "px";
// Depth layers: compensate scale so a layer at z still fills frame.
var layers = el.querySelectorAll("[data-cs-z]");
for (var i = 0; i < layers.length; i++) {
var z = Number(layers[i].getAttribute("data-cs-z")) || 0;
layers[i].style.transform = "translateZ(" + z + "px) scale(" + (D - z) / D + ")";
}
var maxTiltDeg =
Math.asin(Math.min(0.9, (CS_TILT_DEPTH_BUDGET * D) / Math.sqrt((W * W + H * H) / 4))) /
RAD;
function clampTilt(deg) {
return Math.max(-maxTiltDeg, Math.min(maxTiltDeg, deg));
}
function state(t) {
var s = csSample(profile, t, intensity, freqScale);
// Pinhole projection: a camera rotation of theta about its nodal
// point shifts the projected image by D*tan(theta). That shift and
// the plate rotation together ARE the rotation-about-the-nodal-
// point decomposition - it is not double counting.
var x = -D * Math.tan(s.yaw * RAD) + s.px * CS_UNIT_PX;
var y = D * Math.tan(s.pitch * RAD) + s.py * CS_UNIT_PX;
return {
x: x,
y: y,
roll: withRotation ? clampTilt(s.roll) : 0,
pitch: withRotation ? clampTilt(s.pitch) : 0,
yaw: withRotation ? clampTilt(s.yaw) : 0,
dolly: 1 + (s.pz * CS_UNIT_PX) / D,
};
}
// Overscan. The shake is a closed form, so the scale that keeps the
// plate covering the frame is computed per frame and the worst kept.
// Per frame, not worst-of-each-axis: peak pitch and peak yaw do not
// land on the same frame, and combining their maxima would zoom in
// for a frame that never exists. Three terms:
// translation - the plate must reach 2*|offset| further
// roll - a rolled W x H rect covers W x H at
// (W cos r + H sin r) / W (and the H twin)
// keystone - under perspective the edge that tips AWAY shrinks
// toward the projection centre. The lever arm is NOT
// the plate half-size: CSS projects about the FRAME's
// perspective-origin, so a plate that is translated
// AND tipped swings its far corner about a point
// |offset| further out. Using (H/2 + |y|) instead of
// H/2 is what makes this hold on the wide-angle
// profiles; the earlier H/2 form tore a corner off
// the frame at 28mm. Verified by DOM hit-test probe
// across all nine profiles at intensity 1, 2 and 3.
var maxX = 0,
maxY = 0,
maxRoll = 0,
overscan = 1;
for (var f = 0; f <= Math.ceil(dur * fps); f++) {
var st = state(f / fps);
maxX = Math.max(maxX, Math.abs(st.x));
maxY = Math.max(maxY, Math.abs(st.y));
maxRoll = Math.max(maxRoll, Math.abs(st.roll));
var rr = Math.abs(st.roll) * RAD;
var need =
(Math.max(
(W * Math.cos(rr) + H * Math.sin(rr)) / W,
(H * Math.cos(rr) + W * Math.sin(rr)) / H,
) *
Math.max(1 + (2 * Math.abs(st.x)) / W, 1 + (2 * Math.abs(st.y)) / H) *
(1 +
((H / 2 + Math.abs(st.y)) / D) * Math.sin(Math.abs(st.pitch) * RAD) +
((W / 2 + Math.abs(st.x)) / D) * Math.sin(Math.abs(st.yaw) * RAD))) /
Math.max(0.5, st.dolly);
overscan = Math.max(overscan, need);
}
overscan = opts.overscan === undefined ? overscan * 1.02 : Number(opts.overscan);
function apply(t) {
var s = state(t);
gsap.set(el, {
x: s.x,
y: s.y,
rotation: s.roll,
rotationX: s.pitch,
rotationY: -s.yaw,
scale: overscan * s.dolly,
});
}
// Seek-safe driver: GSAP writes `t` on every render, including
// seek(), so the setter runs on every frame. An onUpdate callback
// would NOT - GSAP suppresses events on seek and the shake would
// freeze on frame 0.
var driver = {};
var value = 0;
Object.defineProperty(driver, "t", {
get: function () {
return value;
},
set: function (next) {
value = next;
apply(next);
},
});
apply(0);
tl.to(driver, { t: dur, duration: dur, ease: "none" }, at);
return {
distance: D,
overscan: overscan,
peakX: maxX,
peakY: maxY,
peakRoll: maxRoll,
};
};
/* ---- self-preview (not part of the snippet) ----------------------- */
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var PROFILE = vars.shakeProfile || "handheld-normal-mild";
var INTENSITY = vars.shakeIntensity === undefined ? 1 : Number(vars.shakeIntensity);
var FREQUENCY = vars.shakeFrequency === undefined ? 1 : Number(vars.shakeFrequency);
var ROTATION = !(vars.shakeRotation === false || vars.shakeRotation === "false");
var tl = gsap.timeline({ paused: true });
var info = window.cameraShake(tl, "#cs-rig", {
profile: PROFILE,
intensity: INTENSITY,
frequency: FREQUENCY,
rotation: ROTATION,
duration: 6,
fps: 30,
});
var readout = document.getElementById("cs-readout");
if (readout && info) {
readout.textContent =
PROFILE +
" | " +
CS_LENS_MM[(CS_PROFILES[PROFILE] || CS_PROFILES["handheld-normal-mild"]).lens] +
"mm | x" +
INTENSITY +
" amp x" +
FREQUENCY +
" freq | rot " +
(ROTATION ? "on" : "off") +
" | overscan " +
info.overscan.toFixed(3);
}
window.__timelines["camera-shake"] = tl;
})();
</script>
</body>
</html>
```
</VariablesExplorer>
## Install
<InstallCommand command="npx hyperframes add camera-shake" item="camera-shake" />
That writes one file: `compositions/components/camera-shake.html`.
## Paste it into your composition
Open `compositions/components/camera-shake.html` and copy what is inside into your own composition.
A component has no size or duration of its own. It takes both from the composition
you paste it into.
## Variables
Every one of these has a default, so the piece works untouched. Set the ones you
want to change on the element:
| Variable | Default | Accepts | What it does |
| --- | --- | --- | --- |
| `shakeProfile` | `handheld-normal-mild` | `handheld-normal-mild`, `handheld-normal-strong`, `handheld-normal-extreme`, `handheld-wideangle-mild`, `handheld-wideangle-strong`, `handheld-tele-mild`, `handheld-tele-strong`, `rig-6d-shake`, `rig-6d-wobble` | |
| `shakeIntensity` | `1` | 0 to 3, step 0.05 | |
| `shakeFrequency` | `1` | 0.1 to 4, step 0.05 | |
| `shakeRotation` | `true` | boolean | |
Set them with `data-variable-values` on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:
```html wrap
<div
data-composition-id="camera-shake"
data-composition-src="compositions/components/camera-shake.html"
data-variable-values='{"shakeProfile":"handheld-normal-mild","shakeIntensity":1,"shakeFrequency":1,"shakeRotation":true}'
></div>
```
## Source
<Accordion title={`camera-shake.html`}>
```html
<!doctype html>
<html
lang="en"
data-composition-variables='[
{
"id": "shakeProfile",
"type": "enum",
"label": "Shake profile",
"default": "handheld-normal-mild",
"options": [
{ "value": "handheld-normal-mild", "label": "Handheld - normal lens, mild" },
{ "value": "handheld-normal-strong", "label": "Handheld - normal lens, strong" },
{ "value": "handheld-normal-extreme", "label": "Handheld - normal lens, extreme" },
{ "value": "handheld-wideangle-mild", "label": "Handheld - wide angle, mild" },
{ "value": "handheld-wideangle-strong", "label": "Handheld - wide angle, strong" },
{ "value": "handheld-tele-mild", "label": "Handheld - telephoto, mild" },
{ "value": "handheld-tele-strong", "label": "Handheld - telephoto, strong" },
{ "value": "rig-6d-shake", "label": "Rig - 6D shake (engine buzz)" },
{ "value": "rig-6d-wobble", "label": "Rig - 6D wobble" }
]
},
{
"id": "shakeIntensity",
"type": "number",
"label": "Intensity multiplier",
"default": 1,
"min": 0,
"max": 3,
"step": 0.05
},
{
"id": "shakeFrequency",
"type": "number",
"label": "Frequency multiplier",
"default": 1,
"min": 0.1,
"max": 4,
"step": 0.05
},
{
"id": "shakeRotation",
"type": "boolean",
"label": "Include rotation (roll + tilt/pan)",
"default": true
}
]'
>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Camera Shake</title>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<style>
*,
*::before,
*::after {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
width: 1920px;
height: 1080px;
overflow: hidden;
background: transparent;
}
/* ---- camera-shake ----------------------------------------------------
Procedural handheld / Steadicam / rig shake for ANY wrapper. Two
elements: an overflow-hidden FRAME that carries the lens perspective,
and a RIG inside it that gets the shake transform. Whatever you put
in the rig becomes "the shot".
<div class="camera-shake-frame">
<div class="camera-shake-rig"> ...your content... </div>
</div>
cameraShake(tl, "#my-rig", { profile: "handheld-tele-mild", duration: 8 });
Layers inside the rig may carry data-cs-z="-800" to sit at a depth;
cameraShake() scales them to compensate so they parallax under the
camera instead of sliding as a flat card.
------------------------------------------------------------------- */
.camera-shake-frame {
position: absolute;
inset: 0;
overflow: hidden;
/* perspective is written by cameraShake() from the profile's lens */
}
.camera-shake-rig {
position: absolute;
inset: 0;
transform-style: preserve-3d;
will-change: transform;
}
.camera-shake-rig > * {
transform-style: preserve-3d;
}
/* ---- self-preview stand-in "world" (not part of the snippet) ------- */
.cs-layer {
position: absolute;
inset: 0;
}
.cs-sky {
background: linear-gradient(#070b18 0%, #16264a 52%, #4a6ea8 78%, #b9852f 100%);
}
.cs-skyline {
position: absolute;
left: 0;
right: 0;
bottom: 46%;
height: 220px;
background: repeating-linear-gradient(
90deg,
#0d1428 0 70px,
transparent 70px 96px,
#101a33 96px 140px,
transparent 140px 178px
);
opacity: 0.85;
}
.cs-tower {
position: absolute;
bottom: 44%;
width: 190px;
background: linear-gradient(#1d2b4d, #0a1024);
border-top: 6px solid #2f4a80;
}
.cs-tower::after {
content: "";
position: absolute;
inset: 18px 14px;
background:
repeating-linear-gradient(0deg, #ffd48a33 0 10px, transparent 10px 34px),
repeating-linear-gradient(90deg, #ffd48a2b 0 12px, transparent 12px 40px);
}
.cs-t1 {
left: 300px;
height: 430px;
}
.cs-t2 {
left: 820px;
width: 260px;
height: 640px;
}
.cs-t3 {
left: 1340px;
height: 380px;
}
/* Flat ground plane. A rotateX'd floor would poke through the title
plane under preserve-3d, so depth here comes from translateZ only. */
.cs-floor {
position: absolute;
left: 0;
right: 0;
top: 56%;
bottom: 0;
background:
repeating-linear-gradient(90deg, #4d6ea03d 0 3px, transparent 3px 150px),
repeating-linear-gradient(0deg, #4d6ea03d 0 3px, transparent 3px 70px),
linear-gradient(#0a1224, #04070f);
}
.cs-title {
position: absolute;
left: 0;
right: 0;
top: 300px;
text-align: center;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-weight: 800;
font-size: 148px;
line-height: 1.1;
letter-spacing: -0.03em;
color: #ffffff;
text-shadow: 0 12px 44px rgba(0, 0, 0, 0.75);
}
.cs-title span {
display: block;
}
.cs-post {
position: absolute;
left: 120px;
bottom: 0;
width: 46px;
height: 620px;
background: linear-gradient(#25324f, #060a14);
border-radius: 6px;
}
.cs-post-b {
left: auto;
right: 150px;
height: 720px;
}
/* ---- static frame guide: proves the WORLD moves, not the frame ----- */
#cs-guide {
position: absolute;
inset: 0;
pointer-events: none;
}
/* Thirds as four thin bars, not one full-frame gradient layer: a
full-inset element over the title reads as an occluder to the
layout checker even when its paint is mostly transparent. */
#cs-guide .cs-line {
position: absolute;
background: rgba(255, 255, 255, 0.25);
}
#cs-guide .cs-v1 {
left: 639px;
top: 0;
width: 3px;
height: 1080px;
}
#cs-guide .cs-v2 {
left: 1279px;
top: 0;
width: 3px;
height: 1080px;
}
#cs-guide .cs-h1 {
left: 0;
top: 359px;
width: 1920px;
height: 3px;
}
#cs-guide .cs-h2 {
left: 0;
top: 719px;
width: 1920px;
height: 3px;
}
#cs-guide .cs-reticle {
position: absolute;
left: 910px;
top: 490px;
width: 100px;
height: 100px;
border: 3px solid #ff4d3d;
border-radius: 50%;
}
#cs-guide .cs-reticle::after {
content: "";
position: absolute;
left: 47px;
top: -40px;
width: 3px;
height: 180px;
background: #ff4d3d;
}
#cs-guide .cs-tick {
position: absolute;
width: 70px;
height: 70px;
border: 4px solid #ffffffbb;
}
#cs-guide .cs-tl {
left: 70px;
top: 70px;
border-right: 0;
border-bottom: 0;
}
#cs-guide .cs-tr {
right: 70px;
top: 70px;
border-left: 0;
border-bottom: 0;
}
#cs-guide .cs-bl {
left: 70px;
bottom: 70px;
border-right: 0;
border-top: 0;
}
#cs-guide .cs-br {
right: 70px;
bottom: 70px;
border-left: 0;
border-top: 0;
}
#cs-readout {
position: absolute;
left: 70px;
bottom: 170px;
font-family: Menlo, Consolas, monospace;
font-size: 30px;
letter-spacing: 0.02em;
color: #ffffffe6;
text-shadow: 0 2px 10px rgba(0, 0, 0, 0.9);
}
</style>
</head>
<body>
<!--
WIRING (what you copy into a host composition):
1. the .camera-shake-frame / .camera-shake-rig CSS above
2. the cameraShake() helper in the script below (profile table included)
3. wrap the thing you want shot:
<div class="camera-shake-frame">
<div class="camera-shake-rig" id="shot"> <video .../> </div>
</div>
4. drive it from your paused timeline:
cameraShake(tl, "#shot", { profile: "handheld-wideangle-strong", duration: 8 });
Everything with a `cs-` class below is the self-preview world, not the snippet.
-->
<div
id="cs-root"
data-composition-id="camera-shake"
data-start="0"
data-duration="6"
data-fps="30"
data-width="1920"
data-height="1080"
style="position: relative; width: 1920px; height: 1080px; background: #05070f"
>
<div
class="camera-shake-frame clip"
id="cs-frame"
data-start="0"
data-duration="6"
data-track-index="0"
>
<!-- The rig is deliberately larger than the frame (overscan) and
deliberately leaves it under shake: that IS the effect, so every
moving layer is marked as intentional overflow. -->
<div class="camera-shake-rig" id="cs-rig" data-layout-allow-overflow>
<div class="cs-layer cs-sky" data-cs-z="-900" data-layout-allow-overflow></div>
<div class="cs-layer cs-farlayer" data-cs-z="-520" data-layout-allow-overflow>
<div class="cs-skyline" data-layout-allow-overflow></div>
</div>
<div class="cs-layer cs-midlayer" data-cs-z="-240" data-layout-allow-overflow>
<div class="cs-tower cs-t1" data-layout-allow-overflow></div>
<div class="cs-tower cs-t2" data-layout-allow-overflow></div>
<div class="cs-tower cs-t3" data-layout-allow-overflow></div>
</div>
<div class="cs-layer cs-floorlayer" data-cs-z="-90" data-layout-allow-overflow>
<div class="cs-floor" data-layout-allow-overflow></div>
</div>
<div class="cs-layer cs-titlelayer" data-cs-z="0" data-layout-allow-overflow>
<div class="cs-title">
<span>CAMERA</span>
<span>SHAKE</span>
</div>
</div>
<div class="cs-layer cs-nearlayer" data-cs-z="110" data-layout-allow-overflow>
<div class="cs-post" data-layout-allow-overflow></div>
<div class="cs-post cs-post-b" data-layout-allow-overflow></div>
</div>
</div>
</div>
<div id="cs-guide" class="clip" data-start="0" data-duration="6" data-track-index="1">
<div class="cs-line cs-v1"></div>
<div class="cs-line cs-v2"></div>
<div class="cs-line cs-h1"></div>
<div class="cs-line cs-h2"></div>
<div class="cs-tick cs-tl"></div>
<div class="cs-tick cs-tr"></div>
<div class="cs-tick cs-bl"></div>
<div class="cs-tick cs-br"></div>
<div class="cs-reticle"></div>
<div id="cs-readout">profile</div>
</div>
</div>
<script>
/* =====================================================================
camera-shake - procedural handheld / Steadicam / rig camera shake.
PROVENANCE + LICENCE. The nine profiles below are measured PARAMETER
VALUES (amplitudes in degrees, frequencies in Hz, three octaves per
axis) read off Unity Cinemachine's shipped noise presets. Cinemachine
is under the Unity Companion License, which is NOT permissive: no
Unity file is vendored, copied or imported here, and none of the code
below derives from Unity source. What is reused is the numeric data -
facts about how much a camera moves - plus a three-line sampler shape
that is standard mathematics (sum of octaves of noise / cosine). The
noise function, the screen-space projection, the lens model, the
overscan solver and the seek-safe driver are all original.
DETERMINISM. Every value is a closed-form function of `t`:
channel(t) = (valueNoise(freq*t + offset) - 0.5) * amplitude
channel(t) = cos((freq*t + offset) * 2PI) * amplitude * 0.5
No accumulator, no dt, no clock, no unseeded random. Seeking straight
to frame N produces exactly the same state as stepping to frame N.
The per-frame work is driven from a PROPERTY SETTER on a tweened
driver object - NOT from tl.eventCallback("onUpdate"), which GSAP
suppresses on seek() and which would freeze the shake on frame 0.
===================================================================== */
(function () {
window.__timelines = window.__timelines || {};
var RAD = Math.PI / 180;
/* ---- the nine profiles ------------------------------------------
rot[octave] = [ [ampXdeg, freqHz], [ampY, freq], [ampZ, freq] ]
null = the preset has no channel on that axis for that octave.
`lens` selects the focal length used for the screen projection.
The optical truth in this table: wide-angle carries 12 deg on X
where telephoto carries 4 deg, because a long lens magnifies
angular jitter - amplitude scales inversely with focal length.
Keep the 3x ratio; it is the whole reason there are lens variants.
------------------------------------------------------------------ */
var CS_PROFILES = {
"handheld-normal-mild": {
lens: "normal",
rot: [
[[7, 0.15], [5, 0.1], null],
[[4, 0.8], [2, 0.75], null],
[[1, 1.2], [0.8, 1.5], null],
],
},
"handheld-normal-strong": {
lens: "normal",
rot: [
[[10, 0.4], [10, 0.06], null],
[[5, 1.44], [3, 0.73], null],
[[3, 2.49], [1, 2.0], null],
],
},
"handheld-normal-extreme": {
lens: "normal",
rot: [
[[15, 0.2], [7, 0.25], null],
[[5, 0.9], [3, 1.0], null],
[[2, 2.0], null, null],
],
},
"handheld-wideangle-mild": {
lens: "wide",
rot: [
[[12, 0.15], [5, 0.1], null],
[[5, 0.6], [4, 0.45], null],
[[1, 1.5], [1, 1.2], null],
],
},
"handheld-wideangle-strong": {
lens: "wide",
rot: [
[[17.46, 0.5], [5, 0.25], null],
[
[12.47, 0.94],
[4, 0.5],
[1, 0.4],
],
[[4, 1.2], [2, 1.3], null],
],
},
"handheld-tele-mild": {
lens: "tele",
rot: [
[[4, 0.2], [2, 0.15], null],
[[2, 0.4], [2, 0.5], null],
[[1, 0.7], [1, 0.6], null],
],
},
"handheld-tele-strong": {
lens: "tele",
rot: [
[
[6.19, 0.39],
[4, 0.15],
[1, 0.1],
],
[[1.84, 1.75], [0.5, 0.9], null],
[[2.3, 2.0], [0.5, 1.4], null],
],
},
/* 6D Shake also carries POSITION channels (Unity world units, not
degrees). Every position channel is a "constant" (cosine) channel
except octave-2 Y, which is noise - that asymmetry is in the
measured data and is kept. */
"rig-6d-shake": {
lens: "normal",
rot: [
[
[0.09, 5.83],
[0.059, 1.8],
[0.017, 2.38],
],
[
[0.14, 9.17],
[0.041, 11.35],
[0.009, 10.52],
],
[
[0.15, 57.17],
[0.048, 54.17],
[0.016, 63.76],
],
],
pos: [
[
[0.011, 3.2, 1],
[0.059, 1.9, 1],
[0.021, 3.33, 1],
],
[
[0.009, 7.7, 1],
[0.04, 9.1, 0],
[0.009, 9.22, 1],
],
[
[0.002, 51.51, 1],
[0.05, 55.54, 1],
[0.017, 58.55, 1],
],
],
},
"rig-6d-wobble": {
lens: "normal",
rot: [
[
[0.987, 5.2],
[1.34, 5.39],
[2, 2.23],
],
[
[0.73, 9.17],
[0.86, 11.35],
[0.51, 8.31],
],
[
[0.78, 13.52],
[0.55, 27.66],
[0.28, 18.91],
],
],
},
};
/* Lens -> pinhole projection distance, in pixels.
Two constraints, and they have to be satisfied together:
1) SCALE. These amplitudes were authored against a camera with a
60 degree VERTICAL field of view, so the "normal" lens must
reproduce that framing or every profile comes out roughly twice
as violent as intended: D_normal = (H/2) / tan(30deg).
2) RATIO. 28 / 50 / 85mm are the standard wide / normal / tele
primes; D scales with focal length, so wide:tele is 1:3.04 -
the exact reciprocal of the 12deg:4deg amplitude ratio in the
profile table. That reciprocal is why all seven handheld presets
land within ~15% of the same on-screen displacement while still
looking like completely different lenses. */
var CS_LENS_MM = { wide: 28, normal: 50, tele: 85 };
var CS_REF_VFOV_DEG = 60;
/* Unity position channels are world units with no pixel equivalent.
240 px/unit is AUTHORED (it puts 6D Shake's buzz at a few pixels,
which is what an engine-vibration preset should look like). It is
the one number here that is not measured. */
var CS_UNIT_PX = 240;
/* Tilting the content plate is a stand-in for rotating the camera, and
it degenerates. The plate is a finite rectangle sitting AT the
projection distance, so tipping it drives its far corner backwards
by (half-diagonal * sin tilt); once that approaches D the corner
crosses the eye plane, the projection blows up, and NO amount of
overscan covers the frame - increasing the scale only pushes the
corner further behind the eye. It bites first on wide lenses, where
D is small and the plate is optically enormous.
So the tilt ceiling is derived, not picked: allow the corner to sink
at most a quarter of the way to the eye. 28mm gets ~6.8 deg, 50mm
~12.3 deg, 85mm ~21.2 deg - wide lenses keystone least, which is
also what they look like. The FRAMING swing, which is what the
measured degrees actually encode, is never clamped: the shot still
moves by the full authored amount and only the world's keystone
stops growing. */
var CS_TILT_DEPTH_BUDGET = 0.25;
/* ---- deterministic 1-D value noise (original implementation) ------
Integer hash -> [0,1), smootherstep interpolation between lattice
points. Pure function of (x, seed): no state, no Math.random. */
function csHash(i, seed) {
var h = Math.imul(i | 0, 374761393) + Math.imul(seed | 0, 668265263);
h = (h ^ (h >>> 13)) >>> 0;
h = Math.imul(h, 1274126177) >>> 0;
return ((h ^ (h >>> 16)) >>> 0) / 4294967296;
}
function csNoise(x, seed) {
var i = Math.floor(x);
var f = x - i;
var u = f * f * f * (f * (f * 6 - 15) + 10);
return csHash(i, seed) * (1 - u) + csHash(i + 1, seed) * u;
}
/* One channel of one octave. `constant` picks the cosine form.
Each channel gets its own seed AND its own time offset: sharing
offsets correlates the axes and the shake collapses into a diagonal
line, which is the classic tell of fake handheld. */
function csChannel(amp, freq, t, seed, constant) {
var u = freq * t + seed * 7.13;
if (constant) return Math.cos(u * 2 * Math.PI) * amp * 0.5;
return (csNoise(u, seed) - 0.5) * amp;
}
function csSample(profile, t, intensity, freqScale) {
var rot = [0, 0, 0];
var pos = [0, 0, 0];
var o, a, ch;
for (o = 0; o < profile.rot.length; o++) {
for (a = 0; a < 3; a++) {
ch = profile.rot[o][a];
if (!ch) continue;
rot[a] += csChannel(ch[0] * intensity, ch[1] * freqScale, t, o * 3 + a, 0);
}
}
if (profile.pos) {
for (o = 0; o < profile.pos.length; o++) {
for (a = 0; a < 3; a++) {
ch = profile.pos[o][a];
if (!ch) continue;
pos[a] += csChannel(ch[0] * intensity, ch[1] * freqScale, t, 32 + o * 3 + a, ch[2]);
}
}
}
return { pitch: rot[0], yaw: rot[1], roll: rot[2], px: pos[0], py: pos[1], pz: pos[2] };
}
/* ---- the public helper ------------------------------------------
cameraShake(tl, target, opts)
profile one of the nine ids
intensity amplitude multiplier (default 1)
frequency frequency multiplier (default 1)
rotation false = translation only (gimbal-stabilised look)
duration seconds of shake (default 6)
at timeline position (default 0)
fps sampling rate for the overscan solve (default 30)
overscan force a scale instead of solving for one
Returns { distance, overscan, peakX, peakY, peakRoll }.
------------------------------------------------------------------ */
window.cameraShake = function (tl, target, opts) {
opts = opts || {};
var el = typeof target === "string" ? document.querySelector(target) : target;
if (!el) return null;
var profile = CS_PROFILES[opts.profile] || CS_PROFILES["handheld-normal-mild"];
var intensity = opts.intensity === undefined ? 1 : Number(opts.intensity);
var freqScale = opts.frequency === undefined ? 1 : Number(opts.frequency);
var withRotation = opts.rotation !== false;
var dur = opts.duration === undefined ? 6 : Number(opts.duration);
var at = opts.at === undefined ? 0 : Number(opts.at);
var fps = opts.fps === undefined ? 30 : Number(opts.fps);
var box = el.getBoundingClientRect();
var W = box.width || el.offsetWidth || 1920;
var H = box.height || el.offsetHeight || 1080;
var D = (H / 2 / Math.tan((CS_REF_VFOV_DEG / 2) * RAD)) * (CS_LENS_MM[profile.lens] / 50);
// The frame (overflow-hidden parent) carries the lens perspective so
// that depth layers inside the rig parallax instead of sliding flat.
var frame = el.parentElement;
if (frame) frame.style.perspective = D + "px";
// Depth layers: compensate scale so a layer at z still fills frame.
var layers = el.querySelectorAll("[data-cs-z]");
for (var i = 0; i < layers.length; i++) {
var z = Number(layers[i].getAttribute("data-cs-z")) || 0;
layers[i].style.transform = "translateZ(" + z + "px) scale(" + (D - z) / D + ")";
}
var maxTiltDeg =
Math.asin(Math.min(0.9, (CS_TILT_DEPTH_BUDGET * D) / Math.sqrt((W * W + H * H) / 4))) /
RAD;
function clampTilt(deg) {
return Math.max(-maxTiltDeg, Math.min(maxTiltDeg, deg));
}
function state(t) {
var s = csSample(profile, t, intensity, freqScale);
// Pinhole projection: a camera rotation of theta about its nodal
// point shifts the projected image by D*tan(theta). That shift and
// the plate rotation together ARE the rotation-about-the-nodal-
// point decomposition - it is not double counting.
var x = -D * Math.tan(s.yaw * RAD) + s.px * CS_UNIT_PX;
var y = D * Math.tan(s.pitch * RAD) + s.py * CS_UNIT_PX;
return {
x: x,
y: y,
roll: withRotation ? clampTilt(s.roll) : 0,
pitch: withRotation ? clampTilt(s.pitch) : 0,
yaw: withRotation ? clampTilt(s.yaw) : 0,
dolly: 1 + (s.pz * CS_UNIT_PX) / D,
};
}
// Overscan. The shake is a closed form, so the scale that keeps the
// plate covering the frame is computed per frame and the worst kept.
// Per frame, not worst-of-each-axis: peak pitch and peak yaw do not
// land on the same frame, and combining their maxima would zoom in
// for a frame that never exists. Three terms:
// translation - the plate must reach 2*|offset| further
// roll - a rolled W x H rect covers W x H at
// (W cos r + H sin r) / W (and the H twin)
// keystone - under perspective the edge that tips AWAY shrinks
// toward the projection centre. The lever arm is NOT
// the plate half-size: CSS projects about the FRAME's
// perspective-origin, so a plate that is translated
// AND tipped swings its far corner about a point
// |offset| further out. Using (H/2 + |y|) instead of
// H/2 is what makes this hold on the wide-angle
// profiles; the earlier H/2 form tore a corner off
// the frame at 28mm. Verified by DOM hit-test probe
// across all nine profiles at intensity 1, 2 and 3.
var maxX = 0,
maxY = 0,
maxRoll = 0,
overscan = 1;
for (var f = 0; f <= Math.ceil(dur * fps); f++) {
var st = state(f / fps);
maxX = Math.max(maxX, Math.abs(st.x));
maxY = Math.max(maxY, Math.abs(st.y));
maxRoll = Math.max(maxRoll, Math.abs(st.roll));
var rr = Math.abs(st.roll) * RAD;
var need =
(Math.max(
(W * Math.cos(rr) + H * Math.sin(rr)) / W,
(H * Math.cos(rr) + W * Math.sin(rr)) / H,
) *
Math.max(1 + (2 * Math.abs(st.x)) / W, 1 + (2 * Math.abs(st.y)) / H) *
(1 +
((H / 2 + Math.abs(st.y)) / D) * Math.sin(Math.abs(st.pitch) * RAD) +
((W / 2 + Math.abs(st.x)) / D) * Math.sin(Math.abs(st.yaw) * RAD))) /
Math.max(0.5, st.dolly);
overscan = Math.max(overscan, need);
}
overscan = opts.overscan === undefined ? overscan * 1.02 : Number(opts.overscan);
function apply(t) {
var s = state(t);
gsap.set(el, {
x: s.x,
y: s.y,
rotation: s.roll,
rotationX: s.pitch,
rotationY: -s.yaw,
scale: overscan * s.dolly,
});
}
// Seek-safe driver: GSAP writes `t` on every render, including
// seek(), so the setter runs on every frame. An onUpdate callback
// would NOT - GSAP suppresses events on seek and the shake would
// freeze on frame 0.
var driver = {};
var value = 0;
Object.defineProperty(driver, "t", {
get: function () {
return value;
},
set: function (next) {
value = next;
apply(next);
},
});
apply(0);
tl.to(driver, { t: dur, duration: dur, ease: "none" }, at);
return {
distance: D,
overscan: overscan,
peakX: maxX,
peakY: maxY,
peakRoll: maxRoll,
};
};
/* ---- self-preview (not part of the snippet) ----------------------- */
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var PROFILE = vars.shakeProfile || "handheld-normal-mild";
var INTENSITY = vars.shakeIntensity === undefined ? 1 : Number(vars.shakeIntensity);
var FREQUENCY = vars.shakeFrequency === undefined ? 1 : Number(vars.shakeFrequency);
var ROTATION = !(vars.shakeRotation === false || vars.shakeRotation === "false");
var tl = gsap.timeline({ paused: true });
var info = window.cameraShake(tl, "#cs-rig", {
profile: PROFILE,
intensity: INTENSITY,
frequency: FREQUENCY,
rotation: ROTATION,
duration: 6,
fps: 30,
});
var readout = document.getElementById("cs-readout");
if (readout && info) {
readout.textContent =
PROFILE +
" | " +
CS_LENS_MM[(CS_PROFILES[PROFILE] || CS_PROFILES["handheld-normal-mild"]).lens] +
"mm | x" +
INTENSITY +
" amp x" +
FREQUENCY +
" freq | rot " +
(ROTATION ? "on" : "off") +
" | overscan " +
info.overscan.toFixed(3);
}
window.__timelines["camera-shake"] = tl;
})();
</script>
</body>
</html>
```
</Accordion>
{/* hf:generated-footer */}
Tagged `camera` `shake` `handheld` `effect` `cinematic`.
## Related topics
- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)
Reference in New Issue View Git Blame Copy Permalink