finding the right item

Hello,

I have a problem with getting the right item from a list of items. When I trim a big Brep with a smaller Brep I get a trimmed Brep. That I explode into its components to get just the top surface (green), but there comes the problem: When I move the smaller Brep to the boundary of the bigger one, the resulting Brep gets a different numer of surface items than it had before. So the integer slider has the wrong number and it chooses not the top surface. How can I get ALWAYS only the top surface? It is also not possible to search for the right numer manually.. Grasshopper should do it by itself because I want to work with Galapagos afterwords. Can anybody help me please?

Replies to This Discussion

Permalink Reply by Sylvain Usai on August 12, 2013 at 7:45am

You could look for the surface area and select only the bigger one. Then, to select the top face, maybe sorting the faces according to z coordinate of center point (also given by the area component).

Sylvain.

Permalink Reply by Sylvain Usai on August 12, 2013 at 7:56am

Acutally, in your case, sorting the Z coordinate of the surface's center point is enought :