Version: 2020.2
  • C#


Suggest a change


Thank you for helping us improve the quality of Unity Documentation. Although we cannot accept all submissions, we do read each suggested change from our users and will make updates where applicable.


Submission failed

For some reason your suggested change could not be submitted. Please <a>try again</a> in a few minutes. And thank you for taking the time to help us improve the quality of Unity Documentation.



Switch to Manual
public void SetSubMesh(int index, Rendering.SubMeshDescriptor desc, Rendering.MeshUpdateFlags flags);


index Sub-mesh index. See subMeshCount. Out of range indices throw an exception.
desc Sub-mesh data.
flags Flags controlling the function behavior, see MeshUpdateFlags.


Sets the information about a sub-mesh of the Mesh.

Note that SetSubMesh, SubMeshDescriptor, and SetIndexBufferData are designed for advanced users aiming for maximum performance, because they operate on the underlying mesh data structures that primarily work on raw index buffers, vertex buffers and mesh subset data. Using these methods, Unity performs very little data validation, so you must ensure your data is valid.

In particular, you must ensure that the SubMesh index range and topology are set to correct values. SubMesh indices, both indexStart and indexCount, must not overlap with any other SubMesh indices.

For information about the difference between the simpler and more advanced methods of assigning data to a Mesh from script, see the notes on the Mesh page.

The bounds, SubMeshDescriptor::pef::firstVertex and SubMeshDescriptor::pef::vertexCount values of SubMeshDescriptor are calculated automatically by SetSubMesh, unless MeshUpdateFlags.DontRecalculateBounds flag is passed.

General usage pattern is:

var mesh = new Mesh();

// setup vertex buffer data mesh.vertices = ...;

// set index buffer mesh.SetIndexBufferParams(...); mesh.SetIndexBufferData(...);

// setup information about mesh subsets mesh.subMeshCount = ...; mesh.SetSubMesh(index, ...);

For details on what data to set up for each sub-mesh, see SubMeshDescriptor.

See Also: subMeshCount, GetSubMesh, SetIndexBufferParams, SetIndexBufferData, MeshUpdateFlags.