Rhinocommon can't accesee to Material in panel?

Rhino Developer
,
1

When i import some materials， I can‘t access the material directly from the code like

doc = RhinoDoc.ActiveDoc;
doc.Materials.Find("GlassClear", false);

The code will get -1 which means don’t find ”GlassClear“. When I assign the “GlassClear” to some object manually, the code above will find the material.

2

You need to use the RenderMaterials table on the document to find materials that have not yet been assigned, but are in the document.