I created a window frame and inside 3D window glasses. When I convert it into a mesh form, it has several meshes (19 meshes). Frame is reflective plastic, and there are 16 pieces of glasses.
Hi Pinar - you can Group but not Join them if you want to keep separate materials; what you can do is join all of the glass panels from all windows into one mesh and all the frames into another.
One last question: I grouped one window units all together (frame and glasses), but when I convert them into meshes, they are not grouped anymore. I need to group them again one by one. Is it a shortcut for this?