You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
264 lines
9.7 KiB
264 lines
9.7 KiB
<!DOCTYPE html>
|
|
<html lang="en">
|
|
<head>
|
|
<meta charset="utf-8" />
|
|
<base href="../../../" />
|
|
<script src="page.js"></script>
|
|
<link type="text/css" rel="stylesheet" href="page.css" />
|
|
</head>
|
|
<body>
|
|
|
|
<h1>[name]</h1>
|
|
|
|
<p class="desc">
|
|
A KeyframeTrack is a timed sequence of [link:https://en.wikipedia.org/wiki/Key_frame keyframes],
|
|
which are composed of lists of times and related values, and which are used to animate a
|
|
specific property of an object.
|
|
</p>
|
|
|
|
<p>
|
|
For an overview of the different elements of the three.js animation system see the
|
|
"Animation System" article in the "Next Steps" section of the manual.
|
|
</p>
|
|
|
|
<p>
|
|
In contrast to the animation hierarchy of the
|
|
[link:https://github.com/mrdoob/three.js/wiki/JSON-Model-format-3 JSON model format] a
|
|
`KeyframeTrack` doesn't store its single keyframes as objects in a "keys" array (holding the
|
|
times and the values for each frame together in one place).
|
|
</p>
|
|
|
|
<p>
|
|
Instead of this there are always two arrays in a `KeyframeTrack`: the [page:.times times] array
|
|
stores the time values for all keyframes of this track in sequential order, and the
|
|
[page:.values values] array contains the corresponding changing values of the animated property.
|
|
</p>
|
|
|
|
<p>
|
|
A single value, belonging to a certain point of time, can not only be a simple number, but (for
|
|
example) a vector (if a position is animated) or a quaternion (if a rotation is animated). For
|
|
this reason the values array (which is a flat array, too) might be three or four times as long as the
|
|
times array.
|
|
</p>
|
|
|
|
<p>
|
|
Corresponding to the different possible types of animated values there are several subclasses of
|
|
`KeyframeTrack`, inheriting the most properties and methods:
|
|
</p>
|
|
|
|
<ul>
|
|
<li>[page:BooleanKeyframeTrack]</li>
|
|
<li>[page:ColorKeyframeTrack]</li>
|
|
<li>[page:NumberKeyframeTrack]</li>
|
|
<li>[page:QuaternionKeyframeTrack]</li>
|
|
<li>[page:StringKeyframeTrack]</li>
|
|
<li>[page:VectorKeyframeTrack]</li>
|
|
</ul>
|
|
|
|
<p>
|
|
Some examples of how to manually create [page:AnimationClip AnimationClips] with different sorts
|
|
of KeyframeTracks can be found in the [link:https://threejs.org/examples/jsm/animation/AnimationClipCreator.js AnimationClipCreator]
|
|
file.
|
|
</p>
|
|
|
|
<p>
|
|
Since explicit values are only specified for the discrete points of time stored in the times array,
|
|
all values in between have to be interpolated.
|
|
</p>
|
|
|
|
<p>
|
|
The track's name is important for the connection of this track with a specific property of the
|
|
animated node (done by [page:PropertyBinding]).
|
|
</p>
|
|
|
|
|
|
<h2>Constructor</h2>
|
|
|
|
|
|
<h3>[name]( [param:String name], [param:Array times], [param:Array values], [param:Constant interpolation] )</h3>
|
|
<p>
|
|
[page:String name] - the identifier for the `KeyframeTrack`.<br />
|
|
[page:Array times] - an array of keyframe times, converted internally to a
|
|
[link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array Float32Array].<br />
|
|
[page:Array values] - an array with the values related to the times array, converted internally to a
|
|
[link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array Float32Array].<br />
|
|
[page:Constant interpolation] - the type of interpolation to use. See
|
|
[page:Animation Animation Constants] for possible values. Default is [page:Animation InterpolateLinear].
|
|
</p>
|
|
|
|
|
|
<h2>Properties</h2>
|
|
|
|
|
|
<h3>[property:String name]</h3>
|
|
<p>
|
|
The track's name can refer to morph targets or [page:SkinnedMesh bones] or possibly other values within an animated object. See
|
|
[page:PropertyBinding.parseTrackName] for the forms of strings that can be parsed for property
|
|
binding:
|
|
</p>
|
|
|
|
<p>
|
|
The name can specify the node either using its name or its uuid (although it needs to be in the
|
|
subtree of the scene graph node passed into the mixer). Or, if the track name starts with a dot,
|
|
the track applies to the root node that was passed into the mixer.
|
|
</p>
|
|
|
|
<p>
|
|
Usually after the node a property will be specified directly. But you can also specify a
|
|
subproperty, such as .rotation[x], if you just want to drive the X component of the rotation
|
|
via a float track.
|
|
</p>
|
|
|
|
<p>
|
|
You can also specify bones or multimaterials by using an object name, for example:
|
|
.bones[R_hand].scale; the red channel of the diffuse color of the fourth material in a
|
|
materials array - as a further example - can be accessed with .materials[3].diffuse[r].
|
|
</p>
|
|
|
|
<p>
|
|
PropertyBinding will also resolve morph target names, for example: .morphTargetInfluences[run].
|
|
</p>
|
|
|
|
<p>
|
|
Note: The track's name does not necessarily have to be unique. Multiple tracks can drive the same
|
|
property. The result should be based on a weighted blend between the multiple tracks according to
|
|
the weights of their respective actions.
|
|
</p>
|
|
|
|
<h3>[property:Float32Array times]</h3>
|
|
<p>
|
|
A [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array Float32Array],
|
|
converted from the times array which is passed in the constructor.
|
|
</p>
|
|
|
|
<h3>[property:Float32Array values]</h3>
|
|
<p>
|
|
A [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array Float32Array],
|
|
converted from the values array which is passed in the constructor.
|
|
</p>
|
|
|
|
<h3>[property:Constant DefaultInterpolation]</h3>
|
|
<p>
|
|
The default interpolation type: [page:Animation InterpolateLinear].
|
|
</p>
|
|
|
|
<h3>[property:Constant TimeBufferType ]</h3>
|
|
<p>
|
|
[link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array Float32Array],
|
|
the type of the buffer internally used for the times.
|
|
</p>
|
|
|
|
<h3>[property:Constant ValueBufferType ]</h3>
|
|
<p>
|
|
[link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array Float32Array],
|
|
the type of the buffer internally used for the values.
|
|
</p>
|
|
|
|
|
|
<h2>Methods</h2>
|
|
|
|
|
|
<h3>[method:KeyframeTrack clone]()</h3>
|
|
<p>
|
|
Returns a copy of this track.
|
|
</p>
|
|
|
|
<h3>[method:Interpolant createInterpolant]()</h3>
|
|
<p>
|
|
Creates a [page:LinearInterpolant LinearInterpolant], [page:CubicInterpolant CubicInterpolant]
|
|
or [page:DiscreteInterpolant DiscreteInterpolant], depending on the value of the interpolation
|
|
parameter passed in the constructor.
|
|
</p>
|
|
|
|
<h3>[method:Interpolant getInterpolation]()</h3>
|
|
<p>
|
|
Returns the interpolation type.
|
|
</p>
|
|
|
|
<h3>[method:Number getValueSize]()</h3>
|
|
<p>
|
|
Returns the size of each value (that is the length of the [page:.values values] array divided
|
|
by the length of the [page:.times times] array).
|
|
</p>
|
|
|
|
<h3>[method:DiscreteInterpolant InterpolantFactoryMethodDiscrete]( [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array result] )</h3>
|
|
<p>
|
|
Creates a new [page:DiscreteInterpolant DiscreteInterpolant] from the
|
|
[page:KeyframeTrack.times times] and [page:KeyframeTrack.times values]. A Float32Array can be
|
|
passed which will receive the results. Otherwise a new array with the appropriate size will be
|
|
created automatically.
|
|
</p>
|
|
|
|
<h3>[method:LinearInterpolant InterpolantFactoryMethodLinear]( [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array result] )</h3>
|
|
<p>
|
|
Creates a new [page:LinearInterpolant LinearInterpolant] from the
|
|
[page:KeyframeTrack.times times] and [page:KeyframeTrack.times values]. A Float32Array can be
|
|
passed which will receive the results. Otherwise a new array with the appropriate size will be
|
|
created automatically.
|
|
</p>
|
|
|
|
<h3>[method:CubicInterpolant InterpolantFactoryMethodSmooth]( [link:https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Float32Array result] )</h3>
|
|
<p>
|
|
Create a new [page:CubicInterpolant CubicInterpolant] from the
|
|
[page:KeyframeTrack.times times] and [page:KeyframeTrack.times values]. A Float32Array can be
|
|
passed which will receive the results. Otherwise a new array with the appropriate size will be
|
|
created automatically.
|
|
</p>
|
|
|
|
<h3>[method:this optimize]()</h3>
|
|
<p>
|
|
Removes equivalent sequential keys, which are common in morph target sequences.
|
|
</p>
|
|
|
|
<h3>[method:this scale]()</h3>
|
|
<p>
|
|
Scales all keyframe times by a factor.<br /><br />
|
|
|
|
Note: This is useful, for example, for conversions to a certain rate of frames per seconds (as it
|
|
is done internally by
|
|
[page:AnimationClip.CreateFromMorphTargetSequence animationClip.CreateFromMorphTargetSequence]).
|
|
</p>
|
|
|
|
<h3>[method:this setInterpolation]( [param:Constant interpolationType] )</h3>
|
|
<p>
|
|
Sets the interpolation type. See [page:Animation Animation Constants] for choices.
|
|
</p>
|
|
|
|
<h3>[method:this shift]( [param:Number timeOffsetInSeconds] )</h3>
|
|
<p>
|
|
Moves all keyframes either forward or backward in time.
|
|
</p>
|
|
|
|
|
|
<h3>[method:this trim]( [param:Number startTimeInSeconds], [param:Number endTimeInSeconds] )</h3>
|
|
<p>
|
|
Removes keyframes before `startTime` and after `endTime`,
|
|
without changing any values within the range [`startTime`, `endTime`].
|
|
</p>
|
|
|
|
<h3>[method:Boolean validate]()</h3>
|
|
<p>
|
|
Performs minimal validation on the tracks. Returns true if valid.
|
|
</p>
|
|
|
|
<p>
|
|
This method logs errors to the console, if a track is empty, if the [page:.valueSize value size] is not valid, if an item
|
|
in the [page:.times times] or [page:.values values] array is not a valid number or if the items in the `times` array are out of order.
|
|
</p>
|
|
|
|
<h2>Static Methods</h2>
|
|
|
|
<h3>[method:JSON toJSON]( [param:KeyframeTrack track] )</h3>
|
|
<p>
|
|
Converts the track to JSON.
|
|
</p>
|
|
|
|
|
|
<h2>Source</h2>
|
|
|
|
|
|
<p>
|
|
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
|
|
</p>
|
|
</body>
|
|
</html>
|
|
|