Mesh.SetBoneWeights

参数

说明

设置网格的骨骼权重。

每个顶点最多支持 255 个骨骼权重。每个顶点的骨骼权重必须按最显著的权重优先进行排序。零权重将被忽略。

权重可能以比传入浮点值更低的精度进行存储，因此不要指望使用Mesh.GetAllBoneWeights获得完全相同的值。当前使用的最低精度为 16 位的归一化整数。

其他资源：Mesh.GetAllBoneWeights、Mesh.GetBonesPerVertex、Mesh.boneWeights、Mesh.GetBoneWeights、ModelImporter.maxBonesPerVertex、QualitySettings.skinWeights、SkinnedMeshRenderer.quality。

using UnityEngine;
using Unity.Collections;

public class MeshSetBoneWeights : MonoBehaviour
{
    void Start()
    {
        Animation animation = gameObject.AddComponent<Animation>();
        SkinnedMeshRenderer renderer = gameObject.AddComponent<SkinnedMeshRenderer>();

        // Build a rectangular mesh using four vertices and two triangles, and assign a material to the renderer
        Mesh mesh = new Mesh();
        mesh.vertices = new Vector3[] { new Vector3(0, 0, 0), new Vector3(5, 0, 0), new Vector3(0, 5, 0), new Vector3(5, 5, 0) };
        mesh.triangles = new int[] { 0, 1, 2, 1, 3, 2 };
        mesh.RecalculateNormals();
        renderer.material = new Material(Shader.Find("Standard"));

        // Create a Transform and bind pose for two bones
        Transform[] bones = new Transform[2];
        Matrix4x4[] bindPoses = new Matrix4x4[2];

        // Create a bottom-left bone as a child of this GameObject
        bones[0] = new GameObject("BottomLeftBone").transform;
        bones[0].parent = transform;
        bones[0].localRotation = Quaternion.identity;
        bones[0].localPosition = Vector3.zero;
        // Set the bind pose to the bone's inverse transformation matrix, relative to the root
        bindPoses[0] = bones[0].worldToLocalMatrix * transform.localToWorldMatrix;

        // Create a top-right bone
        bones[1] = new GameObject("TopRightBone").transform;
        bones[1].parent = transform;
        bones[1].localRotation = Quaternion.identity;
        bones[1].localPosition = new Vector3(5, 5, 0);
        bindPoses[1] = bones[1].worldToLocalMatrix * transform.localToWorldMatrix;

        // Create an array that describes the number of bone weights per vertex
        // The array assigns 1 bone weight to vertex 0, 2 bone weights to vertex 1, and so on.
        byte[] bonesPerVertex = new byte[4] { 1, 2, 2, 1 };

        // Create a array with one BoneWeight1 struct for each of the 6 bone weights
        BoneWeight1[] weights = new BoneWeight1[6];

        // Assign the bottom-left bone to vertex 0 (the bottom-left corner)
        weights[0].boneIndex = 0;
        weights[0].weight = 1;

        // Assign both bones to vertex 1 (the bottom-right corner)
        weights[1].boneIndex = 0;
        weights[1].weight = 0.5f;

        weights[2].boneIndex = 1;
        weights[2].weight = 0.5f;

        // Assign both bones to vertex 2 (the top-left corner)
        weights[3].boneIndex = 0;
        weights[3].weight = 0.5f;

        weights[4].boneIndex = 1;
        weights[4].weight = 0.5f;

        // Assign the top-right bone to vertex 3 (the top-right corner)
        weights[5].boneIndex = 1;
        weights[5].weight = 1;

        // Create NativeArray versions of the two arrays
        var bonesPerVertexArray = new NativeArray<byte>(bonesPerVertex, Allocator.Temp);
        var weightsArray = new NativeArray<BoneWeight1>(weights, Allocator.Temp);

        // Set the bone weights on the mesh
        mesh.SetBoneWeights(bonesPerVertexArray, weightsArray);
        bonesPerVertexArray.Dispose();
        weightsArray.Dispose();

        // Assign the bind poses to the mesh
        mesh.bindposes = bindPoses;

        // Assign the bones and the mesh to the renderer
        renderer.bones = bones;
        renderer.sharedMesh = mesh;

        // Assign a simple back-and-forth animation to the bottom-left bone, and play the animation
        // Vertex 0 moves directly with the bone
        // Vertex 1 and 2 also move, but there's less movement because the vertices are also weighted to the top-right bone
        // Vertex 3 doesn't move, because the top-right bone doesn't move
        AnimationCurve curve = new AnimationCurve();
        curve.keys = new Keyframe[] { new Keyframe(0f, 0f, 0f, 0f), new Keyframe(1f, 3f, 0f, 0f), new Keyframe(2f, 0f, 0f, 0f) };
        AnimationClip clip = new AnimationClip();
        clip.legacy = true;
        clip.SetCurve("BottomLeftBone", typeof(Transform), "m_LocalPosition.z", curve);
        clip.wrapMode = WrapMode.Loop;
        animation.AddClip(clip, "test");
        animation.Play("test");

    }
}