Mesh vertex color custom display issue (RH8)

[MWG (Marc Gibson)]

Hi all,

I can’t seem to shade meshes from Grasshopper that have vertex colors with the Custom Preview component in Rhino 8. This issue also extends to the display overrides in the C# script component. Are there any good workarounds for solving this in Rhino 8/Grasshopper?

If the viewport is set to wireframe display, it will still appear shaded however, the geometry will disappear if the display is set to rendered or arctic.
I have attached a Grasshopper file
Vertex_Colour_Example.gh (732.8 KB)

Rendered display:

Wireframe display:

In Rhino 7, mesh vertex color display appears to work without an issue:

It seems like it might stem from the same issue discussed here:

DrawMeshFalseColors but with shading

Hi @dale, @stevebaer, @jeff i have a Rhino.Display.DisplayConduit in which i want to display my mesh with vertex colors. So far this works using below : def PostDrawObjects(self, e): e.Display.DrawMeshFalseColors(self.m_mesh) The mesh is displayed, but constant colored, so there is no shading or lighting. Is there a way to draw in the my conduit with shading / lighting and vertex colors ? I’ve tried all combinations of DisplayPipelineAttributes: def PostDrawObjects(self, e): e.Displ…

This issue also appears to occur when displaying meshes with Display.DrawMeshShaded(Mesh, DisplayMaterial), but not with Display.DrawMeshShaded(Mesh, DisplayMaterial, Int).

Are there any workarounds other than the Display method in C#?