Mesh.GetBonesPerVertex

Returns

NativeArray<byte> Returns the number of non-zero bone weights for each vertex.

Description

The number of non-zero bone weights for each vertex.

The size of the returned array is either Mesh.vertexCount or zero. The array is sorted in vertex index order.

Use in combination with Mesh.GetAllBoneWeights to get bone weights for the vertices in the Mesh.

See Also: Mesh.GetAllBoneWeights, Mesh.SetBoneWeights, ModelImporter.maxBonesPerVertex, QualitySettings.skinWeights, SkinnedMeshRenderer.quality.

using UnityEngine;
using Unity.Collections;

public class SkinnedMeshExample : MonoBehaviour {
    void Start() {
        // Get a reference to the mesh
        var skinnedMeshRenderer = GetComponent<SkinnedMeshRenderer>();
        var mesh = skinnedMeshRenderer.sharedMesh;

        // Get the number of bone weights per vertex
        var bonesPerVertex = mesh.GetBonesPerVertex();

        // Get all the bone weights, in vertex index order
        var boneWeights = mesh.GetAllBoneWeights();

        // Keep track of where we are in the array of bones, as we iterate over the vertices
        var bonesIndex = 0;

        // Iterate over the vertices
        for (var vertIndex = 0; vertIndex < mesh.vertexCount; vertIndex++) {
            var numberOfBonesForThisVertex = bonesPerVertex[vertIndex];
            Debug.Log("This vertex has " + numberOfBonesForThisVertex + " bones");
            
            // For each vertex, iterate over the array of bones the correct number of times
            for (var i = 0; i < numberOfBonesForThisVertex; i++) {
                var currentBoneWeight = boneWeights[bonesIndex];
                Debug.Log("Bone weight " + currentBoneWeight.boneIndex + " == " + currentBoneWeight.weight);
                bonesIndex++;
            }
        }
    }
}