メッシュの頂点インデックス可視化

ShowMeshIndex.cs

using UnityEngine;

[ExecuteInEditMode]
public class ShowMeshIndex : MonoBehaviour
{
    [Range(0.0f, 10.0f)]
    public float vertexSize = 1;
    public Color vertexColor;
    [Range(0, 50)]
    public int fontSize = 10;

    MeshFilter  meshFilter;

    void Start()
    {
        meshFilter = GetComponent<MeshFilter>();

        Mesh mesh = Mesh.Instantiate(meshFilter.sharedMesh);
        meshFilter.mesh = mesh;
        int[] triangles = mesh.triangles;
        int length = triangles.Length;
        for (int i = 0; i < length; i+=3) {
            print(i/3 + ":" + triangles[i] + "," + triangles[i+1] + "," + triangles[i+2]);
        }

        print("uv");
        Vector2[] uv = mesh.uv;
        length = uv.Length;
        for(int i = 0; i < length; i++) {
            print(i + ":" + uv[i]);
        }

    }

    void Update()
    {

    }

#if UNITY_EDITOR
    private void OnDrawGizmos()
    {
        GUIStyle    style       = new GUIStyle();
        Matrix4x4   matrix      = meshFilter.transform.localToWorldMatrix;
        Mesh        mesh        = meshFilter.sharedMesh;
        meshFilter.mesh = mesh;
        Vector3[]   vertices    = mesh.vertices;

        style.fontSize  = fontSize;
        Gizmos.color    = vertexColor;

        int length = vertices.Length;
        for (int i = 0; i < length; i++) {
            Vector3 position = matrix.MultiplyPoint(vertices[i]);
            Gizmos.DrawSphere(position, vertexSize);

            UnityEditor.Handles.Label(position, i.ToString(), style);

        }

    }
#endif
}