Project to surface / Intersection issues


#1

Hi, this issue originally arose in a grasshopper definition where I was projecting thousands of circles on to a wavy surface, however, it appears to be an underlying issue with rhino’s intersection algorithm (or perhaps a mathematical problem with my particular surface). In the attached file, I have simplified the problem to a surface and a cylinder. When you run the “intersect” command, it generates only 3/4 of the circle on the surface. There are several points around this surface where this happens. Any ideas what is causing this?

Thank you!
Steven
131125 Project Bug.3dm (546.5 KB)


(Pascal Golay) #2

Hi Steven- This does look like a bug in the intersector to me- if you rotate the cylinder on its centerline a little =, to get the knots at the quadrants off the wavy surface, it works. You can also InsertKnot on the cylinder, in the V direction, Automatic (once) and it will work. Thanks for sending this example, I’ll get it on the pile.

-Pascal


#3

Thanks Pascal! Do you think this will be fixed in the next release?

Steven