attr | The vertex data attribute to check for. |
int The byte offset within a atream of the data attribute, or -1 if it is not present.
Get offset within a vertex buffer stream of a specific vertex data attribute on this Mesh.
Meshes usually use a single vertex buffer stream, but it is possible to set up a vertex layout where attributes
use different vertex buffers (see SetVertexBufferParams). When you use such a layout, use this function to query where a given attribute is located in a stream.
Note that this function returns the byte offset within a stream, without specifying which stream. To identify the stream that contains a given attribute, use GetVertexAttributeStream.
using UnityEngine; using UnityEngine.Rendering;
public class ExampleScript : MonoBehaviour { void Start() { // Create a Mesh with custom vertex data layout: // position and normal go into stream 0, // color goes into stream 1. var mesh = new Mesh(); mesh.SetVertexBufferParams(10, new VertexAttributeDescriptor(VertexAttribute.Position, VertexAttributeFormat.Float32, 3, stream:0), new VertexAttributeDescriptor(VertexAttribute.Normal, VertexAttributeFormat.Float32, 3, stream:0), new VertexAttributeDescriptor(VertexAttribute.Color, VertexAttributeFormat.UNorm8, 4, stream:1));
// Prints offsets: 0, 12, 0 Debug.Log($"Position offset {mesh.GetVertexAttributeOffset(VertexAttribute.Position)}"); Debug.Log($"Normal offset {mesh.GetVertexAttributeOffset(VertexAttribute.Normal)}"); Debug.Log($"Color offset {mesh.GetVertexAttributeOffset(VertexAttribute.Color)}");
// Cleanup Object.DestroyImmediate(mesh); } }
Additional resources: VertexAttribute, HasVertexAttribute, GetVertexAttributeStream, vertexBufferCount, GetVertexBufferStride.