1  using UnityEngine;
 2  
 3  [RequireComponent(typeof(MeshFilter))]
 4  public class MeshIndexToUV : MonoBehaviour
 5  {
 6      [ContextMenu("Apply Vertex Indices To UVs")]
 7      void ApplyIndices()
 8      {
 9          MeshFilter mf = GetComponent<MeshFilter>();
10          Mesh mesh = mf.sharedMesh;
11  
12          if (mesh == null)
13          {
14              Debug.LogError("No mesh found on MeshFilter!");
15              return;
16          }
17  
18          int vertexCount = mesh.vertexCount;
19          Vector2[] uvs = new Vector2[vertexCount];
20  
21          for (int i = 0; i < vertexCount; i++)
22          {
23              // Store the vertex index in UV.x
24              uvs[i] = new Vector2(i, 0);
25          }
26          Mesh meshCopy = Instantiate(mesh);
27          meshCopy.SetUVs(2, new System.Collections.Generic.List<Vector2>(uvs));
28          // Optional: rename so it’s clear this is a copy
29          meshCopy.name = mesh.name + "_Copy";
30  
31          // Assign back so we are not editing the original
32          mf.mesh = meshCopy;
33      }
34      
35      [ContextMenu("Create and Bind Texture Attributes")]
36      void CreateAndBindTextureAttributes()
37      {
38          MeshFilter mf = GetComponent<MeshFilter>();
39          Mesh mesh = mf.sharedMesh;
40          
41          var material = GetComponent<Renderer>().sharedMaterial;
42          
43          int vertexCount = mesh.vertexCount;
44          Texture2D attributeTex = new Texture2D(vertexCount, 1, TextureFormat.RGBAFloat, false, true);
45          attributeTex.filterMode = FilterMode.Point;
46  
47  // Fill it with your data
48          Color[] data = new Color[vertexCount];
49          for (int i = 0; i < vertexCount; i++) {
50              Vector3 velocity;
51              velocity.x = (i%3 == 0)?1:0;
52              velocity.y = (i%3 == 1)?1:0;
53              velocity.z = (i%3 == 2)?1:0;
54              data[i] = new Color(velocity.x, velocity.y, velocity.z, 1);
55              // data[i] = new Color(0, 0, 0, 1);
56          }
57          
58          ComputeBuffer buffer = new ComputeBuffer(vertexCount, sizeof(float) * 4);
59          buffer.SetData(data);
60          material.SetBuffer("_AttrBuffer", buffer);
61          material.SetInt("_VertexCount", mesh.vertexCount);
62      }
63  }