I think your issue might be with the geometry that you're trying to project the curves onto. There are maybe a few things I would try. First I would try scaling up the geometry, since the curves look like they might lie just off the edge. Second I would actually extrude the curves with the same projection vector through the surface and see what the intersection curves end up like.
Best, Damien On Apr 12, 10:04 am, Grandtour <[email protected]> wrote: > look at this picture which is more clear(http:// > grasshopper3d.googlegroups.com/web/Snap60%E5%89%AF%E6%9C%AC.jpg? > hl=en&gda=VtqwOE4AAAC19Ve3i4OoV9kZmG4Q4mscNIkyP- > tCUghW1QuVVlVA61YqcskqebAbKftsofvUXEUn7qXJT5AHaveIBVLZAuxz47Cl1bPl-23V2XOW7kn5sQ&gsc=qfXejhYAAADUzyauo2L8w- > tO_BGKbWcFaKk2tFLs90LD5qOQGCC3Kw)
