attr | The vertex data attribute to check for. |
int Stream index of the data attribute, or -1 if it is not present.
Gets the vertex buffer stream index 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 which vertex buffer stream a given attribute is part of.
Note that this function returns the index of the stream, without specifying where the attribute is within the stream. To identify the location of a given attribute in the stream, use GetVertexAttributeOffset.
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 stream indices: 0, 0, 1 Debug.Log($"Position stream {mesh.GetVertexAttributeStream(VertexAttribute.Position)}"); Debug.Log($"Normal stream {mesh.GetVertexAttributeStream(VertexAttribute.Normal)}"); Debug.Log($"Color stream {mesh.GetVertexAttributeStream(VertexAttribute.Color)}");
// Cleanup Object.DestroyImmediate(mesh); } }
Additional resources: VertexAttribute, HasVertexAttribute, GetVertexAttributeOffset, vertexBufferCount, GetVertexBufferStride.
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