Question How can I scale the mesh used in DrawMeshInstancedIndirect

The question is pretty straightforward. I'm executing DrawMeshInstancedIndirect using Unity's default quad as the mesh.

I want to know if it's possible to scale this mesh (so I can test the quality of the results with bigger and smaller mesh size) to execute the instancing.

If possible, I prefer not to change the original geometry of the mesh, since it is used in some other places. Maybe there is a good way to create a copy of it and scale? I'm opened to suggestions on the best approach for that.

 

Hey, if you would like to create a copy of default quad mesh in Unity Editor, I suggest installing FBX Exporter in the Package Manager.

After installing, select the GameObject with quad mesh in the scene hierarchy.

Right click and select something like "Export to FBX" in the right click menu.

After exporting, select the exported fbx, then you may change the "scale" in fbx import panel. (and apply)

 

Another way seems to be calculating modified transform matrices and pass them to a custom shader.

https://forum.unity.com/threads/drawmeshinstancedindirect-with-transforms-matrices.807492/

I think using FBX Exporter should be an easier solution.

 

I just cloned the mesh in the Start method and multiplied all the vertices positions by the scale I wanted.