I have a set of extruded contours, and I just want the outer layer, meaning I want to make a boolean union out of them and merge all the coplanar faces. This way the geometry will not be so heavy.
It should be quite a simple thing to do but boolean union does not work or takes ages…
Maybe converting the geometry to meshes enables a better workflow to eliminate interior faces once its all joined into a single mesh?
Hello- does the BU work in stages? 4-5 at a time?
-Pascal
Hey Pascal, it does. Takes about 10 seconds or so. Will take some time to do all contours.
Maybe boolean meshes is faster? Will try that.
Perhaps you should try shrinkwrap in rhino wip?
How many?
-Pascal
1495 contour breps. 
I still tried it but it started to fail after at some points 
Can you post (public) or send (tech@mcneel.com) one or two of the failures?
-Pascal
