See picture through surface material

@hugh_groves wrote:

I’m creating some surfaces in a grasshopper preview that are somewhat transparent.

Rhino.Display.DisplayMaterial dm = new Rhino.Display.DisplayMaterial(color, transparency);
args.Display.DrawBrepShaded(brep, dm);

For looking through the surface and seeing CAD objects this is fine. However, one of my users wants to see a background picture that he has inserted, and no matter the transparency value of view mode this is always blocked by my preview brep.

However, if in Rhino I create a surface then apply a glass material to it and set Rhino to render mode I can see the picture through the surface. How do I create my own ‘glass’ materials for previewing purposes?

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