Identifying different nodes

[omidbrb]

Hi,

I´m using the screenToWorld and intersectLine functions to identify the object being seen at a specific point on the screen, like this:

http://www.worldviz.com/vizhelp/comm...ersectLine.htm

My question is, is it possible to distinguish between different polygons/subobjects in a 3D model? For example, different leaves of a tree model?

Thanks,
Omid