javascript - 如何使用 Three.js 定位 Blender 动画导出

Question

我已经使用 Three.js 导出实用程序成功地从 Blender 导出了一个动画，并且可以将它添加到 Three.js 场景中:

http://jsfiddle.net/frogt/6HxRP/1/

但是，一旦我将对象添加到我的场景中，我似乎无法手动定位它。这是我用来从 Blender 导出创建网格和动画的代码:

var callback = function (geometry, materials) {

        var skinnedMesh = new THREE.Mesh(geometry, new THREE.MeshPhongMaterial({
            color: 'green'
        }));
        skinnedMesh.receiveShadow = true;

        THREE.AnimationHandler.add(skinnedMesh.geometry.animation);

        var animation = new THREE.Animation(skinnedMesh,
                "ArmatureAction",
                THREE.AnimationHandler.CATMULLROM
        );

        animation.interpolationType = THREE.AnimationHandler.CATMULLROM_FORWARD;

        // This positioning doesn't work....
        skinnedMesh.position.y = 50;
        skinnedMesh.position.x = 50;
        skinnedMesh.position.z = 50;

        animation.play();

        scene.add(skinnedMesh);

    };

这是 Blender 导出的动画:

"animation": {
    "name": "ArmatureAction",
    "fps": 24,
    "length": 4.125,
    "hierarchy": [{
        "parent": -1,
        "keys": [{
            "time": 0,
            "pos": [0, -0.998347, -0],
            "rot": [0, 0, -0, 1],
            "scl": [1, 1, 1]
        }, {
            "time": 2,
            "pos": [0, 3.92237, -0],
            "rot": [0, 0, -0, 1]
        }, {
            "time": 4.125,
            "pos": [0, -0.667432, 1.77636e-15],
            "rot": [0, 0, -0, 1],
            "scl": [1, 1, 1]
        }]
    }]

动画的位置似乎被锁定到导出动画中的“pos”数组。

我的问题是:添加到 Three.js 场景后如何手动定位(和移动)动画？

我正在使用 Three.js r67

Answer 1

我设法通过修改 Three.js 源找到解决方案。在 THREE.Animation.prototype.update() 方法中我替换了

vector.x = vector.x + ( currentPoint[ 0 ] - vector.x ) * proportionalWeight;
vector.y = vector.y + ( currentPoint[ 1 ] - vector.y ) * proportionalWeight;
vector.z = vector.z + ( currentPoint[ 2 ] - vector.z ) * proportionalWeight;

与

var xOrig = this.root.position.x;
var yOrig = this.root.position.y;
var zOrig = this.root.position.z;

vector.x = (vector.x + ( currentPoint[ 0 ] - vector.x ) * proportionalWeight) + xOrig;
vector.y = (vector.y + ( currentPoint[ 1 ] - vector.y ) * proportionalWeight);
vector.z = (vector.z + ( currentPoint[ 2 ] - vector.z ) * proportionalWeight) + zOrig;

这仅适用于 X 轴和 Z 轴，这是我特定应用所需的全部。但是，这似乎不是解决问题的“正确”方法。