Mostafa - 2018-11-20

Hi,
I have Three meshobjects in a freeform, I want to assign a material for one of meshobjects. for example, one of these objects is glass and it needs to be transparent. I saw "https://sourceforge.net/p/glscene/discussion/93606/thread/37184757/" and found that I should create face group for any mesh objects In order to add material to mesh objects , but I don't know how create facegrop for any of mesh objects. Thanks if you help