Version: 2021.3

Mesh.GetVertexAttributeOffset

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public int GetVertexAttributeOffset (Rendering.VertexAttribute attr);

参数

attr The vertex data attribute to check for.

返回

int The byte offset within a atream of the data attribute, or -1 if it is not present.

描述

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); } }