I have been trying to get contour lines from a site model. The starting point was a mesh which was then converted to nurbs surfaces and finally, I used drape to create a clean single surface topography.
Not matter what I try, I cannot get contour lines from it.
I have used contour tool but it creates only a few contours, not at every metre like I need. It is inconsistent in that it creates some but by no means all.
I have tried to do it manually by creating a plan and intersecting it with the surface but some contours are impossible to create (“intersect failed”).
I had a concern that the surface was too big so I cut it into 8 smaller bits and still it does not work properly.
I have tried using boolean tools instead to create a new edge that I could then use dupedge to extract the curve. That didn’t work.
I have tried split.
I have tried trim.
I have tried on both Mac and Windows versions of Rhino (latest releases).
If anyone has any tips it would be most appreciated. Attached is the draped surface which I have then trimmed around the perimeter to deal with the way the draped surface tends to ‘fall off’ at the edges (please note I have tried all of the above on a non-trimmed surface).
topo_for rhino forums.3dm (4.1 MB)