Mesh.indexBufferTarget

Description

The intended target usage of the Mesh GPU index buffer.

By default, Mesh index buffers have GraphicsBuffer.Target.Index usage target. If you want to access the mesh index buffer from a compute shader, additional targets need to be requested, for example GraphicsBuffer.Target.Raw.

using UnityEngine;

public class ExampleScript : MonoBehaviour
{
    public Mesh mesh;
    public ComputeShader computeShader;
    void Start()
    {
        // Mark the index buffer as needing "Raw"
        // (ByteAddressBuffer, RWByteAddressBuffer in HLSL shaders)
        // access.
        mesh.indexBufferTarget |= GraphicsBuffer.Target.Raw;
        // Get the index buffer of the Mesh, and set it up
        // as a buffer parameter to a compute shader.
        var indexBuffer = mesh.GetIndexBuffer();
        computeShader.SetBuffer(0, "MeshIndexBuffer", indexBuffer);
        indexBuffer.Dispose();
    }
}

Additional resources: Target, GetIndexBuffer, vertexBufferTarget.