绑定姿势

【绑定姿势】

　　//The Bind Pose Matrices allow a raw vertex of the mesh (in local coordinates) to be transformed into world-space
　　// and then to each bone's local coordinate space, after which each bone's animation can be applied to the vertex in question
　　// (under the influence of the weighting value). The mesh's bind pose takes the vertex from local space to world-space,
　　// and then each bone's inverse bind pose takes the mesh vertex from world-space to the local space of that bone.

　　// The mesh's Bind Pose Matrix takes its vertices into world-space, to the location at the time of binding,
　　// and each bones' Bind Pose Matrix takes the bones from local space to world-space at the time of binding.

　　bind pose是指将vertex从local coord转换到world coord的matrix。而inverse bind pose起相反world 2 local的作用。

　　在Unity中，上述的mesh bind pose与bone inverse bind pose，合2为一，为mesh.bindposes属性。

　　

　　Unity官方示例中，有一段计算 bindPose的代码，

        Transform[] bones = new Transform[2];
        Matrix4x4[] bindPoses = new Matrix4x4[2];
        bones[0] = new GameObject("Lower").transform;
        bones[0].parent = transform;
        // Set the position relative to the parent
        bones[0].localRotation = Quaternion.identity;
        bones[0].localPosition = Vector3.zero;
        // The bind pose is bone's inverse transformation matrix
        // In this case the matrix we also make this matrix relative to the root
        // So that we can move the root game object around freely
        bindPoses[0] = bones[0].worldToLocalMatrix * transform.localToWorldMatrix;

　　

参考：http://blog.csdn.net/watersevenmmfx/article/details/51920439