Hi, all i am new to this website.

I have done some architectural design in sketch up pro 2013.
I exported to it .dae file collada file.
imported in lumion 4 pro..

In sketchup i given grass material for only some portion.
so my question is when i activate the grass in the lumion,
grass is looking everywhere in the model, i want to activate only in some portion of that where i applied grass material in sketchup. what to do for this kind of problem. pls help me...