Texture Coordinate Modification Not Working in Rhino 8.0

Rhino Developer
1

Dear Rhino Developers,

I’m encountering a critical compatibility issue between Rhino 7.0 and 8.0, and would greatly appreciate your expertise.

Problem Summary:

  • Preconditions: Material and texture axes are properly configured before execution.
  • Project Constraint: I can ONLY modify the mesh’s m_T texture coordinate array .
  • Rhino 7.0: Directly modifying m_T (see code below) successfully updates texture display.
  • Rhino 8.0: Identical code executes without errors, but no visual changes to texture.

Code Snippet (Working in 7.0, Failing in 8.0):

const CRhinoMeshObject* mesh_obj = CRhinoMeshObject::Cast(ob);
if (mesh_obj)
{
    const ON_Mesh* mesh = mesh_obj->Mesh();
    if (mesh)
    {
        ON_Mesh* copy_mesh = mesh->Duplicate();
        if (copy_mesh)
        {
            for (int i = 0; i < copy_mesh->m_T.Count(); i++)
            {
                ON_2fPoint pt(copy_mesh->m_T[i].x * 1.5, copy_mesh->m_T[i].y * 2);
                copy_mesh->m_T[i] = pt;
            }
            RhinoApp().ActiveDoc()->ReplaceObject(mesh_obj, *copy_mesh);
        }
    }
}

Best regards,
Ye