Is it possible to set the shared mesh of a collider to just the first set of indices of the mesh (through code) ?

Hello!,

In my code, I have something like this

     mesh.subMeshCount   = 2;
     mesh.vertices       = SomeVertsArray;
     var solidBlocksTris = SomeTrisArray;
     var lquidBlocksTris = AntrTrisArray;

     mesh.SetIndices(solidBlocksTris, MeshTopology.Triangles, 0);
     mesh.SetIndices(lquidBlocksTris, MeshTopology.Triangles, 1);

     mesh.Optimize();
     mesh.RecalculateBounds();
     mesh.RecalculateNormals();

     filter.mesh = mesh;
     filter.mesh.uv = someUvArray;

     // Mesh m = new Mesh();
     // m.vertices  = SomeVertsArray; // more verts than needed
     // m.triangles = solidBlocksTris;
     // collider.sharedMesh = m;

     collider.sharedMesh = mesh;

     

the thing is that, setting sharedMesh = mesh for the collider uses both the first and second set of indices for collision, but I'm using the second set of indices as water, and it should have no collider.

Is there any way to set the shared mesh of a collider to just the first set of indices of the mesh?

or

Using the commented part of code does work, but I don't know the performance impact that using another Mesh could have in contrast with using the same as the filter.

Any help would be greatly appreciated : )