Mesh.GetVertexBufferStride

Parameters

Returns

int Vertex data size in bytes in this stream, or zero if the stream is not present.

Description

Get vertex buffer stream stride in bytes.

Meshes usually use a single vertex buffer stream. But it is possible to setup a vertex layout where some attributes use different vertex buffers (see SetVertexBufferParams, VertexAttributeDescriptor). You can use this function to query vertex data size in bytes within the given stream.

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 2 (two vertex streams)
        Debug.Log($"Vertex stream count: {mesh.vertexBufferCount}");
        // Next two lines print: 24 (12 bytes position + 12 bytes normal), 4 (4 bytes color)
        Debug.Log($"Steam 0 stride {mesh.GetVertexBufferStride(0)}");
        Debug.Log($"Steam 1 stride {mesh.GetVertexBufferStride(1)}");

        // Cleanup
        Object.DestroyImmediate(mesh);
    }
}

Additional resources: vertexBufferCount, GetVertexAttributeOffset, SetVertexBufferParams.