如何在 Sketchup 中获取组的材质？

Question

I have done iterating through the entities in a group, getting all the faces, and then getting the material of each face. However, if the material belongs to a group, there is no material on the face. How do I get the material of the group in this case? I use the C API.

Answer 1

I found the answer, convert the group object into an entity, and then get the texture of the entity through the SUTextureWriterLoadEntity method。

SUGroupRef _group；
long EntityTextureId = 0;    
SUTextureWriterLoadEntity(m_uvWrite, SUGroupToEntity(_group), &EntityTextureId)

Answer 2

A face can have a front material (and back material) and still be in a group with a group material. In fact it's very common. In that case, the face material takes precedence over the group material.

SU_RESULT SUFaceGetFrontMaterial(SUFaceRef face, SUMaterialRef* material);
SU_RESULT SUFaceGetBackMaterial(SUFaceRef face, SUMaterialRef* material);

In addition, there is a much more direct way to get the material of a group.

SUDrawingElementRef draw = SUGroupToDrawingElement(group);
SUMaterialRef material = SU_INVALID;
SUDrawingElementGetMaterial(draw, &material);