MorphWeightSpline
查阅Mars3D API

new Cesium.MorphWeightSpline(options)
engine/Source/Core/MorphWeightSpline.js 42

A spline that linearly interpolates over an array of weight values used by morph targets.
参数名称 类型 描述信息
options object Object with the following properties:
参数名称 类型 描述信息
times Array.<number> An array of strictly increasing, unit-less, floating-point times at each point. The values are in no way connected to the clock time. They are the parameterization for the curve.
weights Array.<number> The array of floating-point control weights given. The weights are ordered such that all weights for the targets are given in chronological order and order in which they appear in the glTF from which the morph targets come. This means for 2 targets, weights = [w(0,0), w(0,1), w(1,0), w(1,1) ...] where i and j in w(i,j) are the time indices and target indices, respectively.
Throws:
使用示例:
const times = [ 0.0, 1.5, 3.0, 4.5, 6.0 ];
const weights = [0.0, 1.0, 0.25, 0.75, 0.5, 0.5, 0.75, 0.25, 1.0, 0.0]; //Two targets
const spline = new Cesium.WeightSpline({
    times : times,
    weights : weights
});

const p0 = spline.evaluate(times[0]);
参考:

方法

clampTime(time) → number
engine/Source/Core/MorphWeightSpline.js 127

Clamps the given time to the period covered by the spline.
参数名称 类型 描述信息
time number The time.
返回值:
The time, clamped to the animation period.

evaluate(time, result) → Array.<number>
engine/Source/Core/MorphWeightSpline.js 140

Evaluates the curve at a given time.
参数名称 类型 描述信息
time number The time at which to evaluate the curve.
result Array.<number> 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new instance of the point on the curve at the given time.
Throws:
  • DeveloperError : time must be in the range [t0, tn], where t0 is the first element in the array times and tn is the last element in the array times.

findTimeInterval(time) → number
engine/Source/Core/MorphWeightSpline.js 108

Finds an index i in times such that the parameter time is in the interval [times[i], times[i + 1]].
参数名称 类型 描述信息
time number The time.
返回值:
The index for the element at the start of the interval.
Throws:
  • DeveloperError : time must be in the range [t0, tn], where t0 is the first element in the array times and tn is the last element in the array times.

wrapTime(time) → number
engine/Source/Core/MorphWeightSpline.js 118

Wraps the given time to the period covered by the spline.
参数名称 类型 描述信息
time number The time.
返回值:
The time, wrapped around to the updated animation.
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