关键字顶点动画

几个关键点：

material..morphTargets = true;    //开启顶点动画
//    http://catchvar.com/threejs-animating-blender-models
//动画的基本控制参数
var animOffset       = 0,   // starting frame of animation
    walking         = false,
    duration        = 1000, // milliseconds to complete animation
    keyframes       = 20,   // total number of animation frames 设定了多少个关键帧
    interpolation   = duration / keyframes,   // milliseconds per frame
    lastKeyframe    = 0,    // previous keyframe
    currentKeyframe = 0;
//渲染方法
function render()
{
    if ( android ) // exists / is loaded
    {
 // Alternate morph targets
 time = new Date().getTime() % duration;
 keyframe = Math.floor( time / interpolation ) + animOffset;
 if ( keyframe != currentKeyframe )
 {
    android.morphTargetInfluences[ lastKeyframe ] = 0;
    android.morphTargetInfluences[ currentKeyframe ] = 1;
    android.morphTargetInfluences[ keyframe ] = 0;
    lastKeyframe = currentKeyframe;
    currentKeyframe = keyframe;
 }
 android.morphTargetInfluences[ keyframe ] =
    ( time % interpolation ) / interpolation;
 android.morphTargetInfluences[ lastKeyframe ] =
    1 - android.morphTargetInfluences[ keyframe ];
    }
    renderer.render( scene, camera );
}

Mesh中的解释，就是通过这个取各个关键帧的数据

.morphTargetInfluences : Array

An array of weights typically from 0-1 that specify how much of the morph is applied. Undefined by default, but reset to a blank array by updateMorphTargets.

FYI：https://stemkoski.github.io/Three.js/Model-Animation.html

//加入控制

https://stemkoski.github.io/Three.js/Model-Animation-Control.html