I have got a terrain model in rhino and i want to exactly locate the lowest and highest point in the terrain to act as reference points but i cant seem to be able to do that. I have tried using bounding box to locate the points but it is of no use. Can someone help me out?

I cranked the tolerance in the file down from 0.01 feet down to 0.0001 . If you are looking for accruacy, tolerance needs to be atleast 10x smaller then the smallest value you are concerned about. This is a very important setting. I get a low point of -24.72445,-148.28142,2.32116 feet. I get a h…

You cannot evaluate the accruacy of the values based on the display of the intersection between the Shaded surface and the line intersection. The shading and linework for display is done by the GPU on the video card and it limited Zbuffer capabilities. Many Zbuffers have a limited 256 layers to di…

This solution is based on Rhino 7. First draw flat, horizontal surface above (or below) your curved surface. Next run PointDeviation command between these surfaces. [PointDeviation] Next use minimum and maximum distance from this command to draw two more flat surfaces: one slightly below your cur…

[image] scottd: I cranked the tolerance in the file down from 0.01 feet down to 0.0001 . If you are looking for accruacy, tolerance needs to be atleast 10x smaller then the smallest value you are concerned about. This is a very important setting. Yep, but you used my file with the mesh settin…

Have you tried with Grasshopper?

[image] Helvetosaur: Yep, but you used my file with the mesh settings cranked up for your example. Try it on the original with your higher tolerances but the mesh settings as they were in the original… There will be a difference of 3/4" between the lower curve centroid and the actual surface. Th…

I simply take the surface and run BoundingBox on it. I get a max height of 11.178533’ and a min of 2.388637’ What is the right answer supposed to be? Still not real clear what a mesh has to do with it?

The right answer is that the calculation of the bounding box is mesh setting dependent, as per my previous post with detailed instructions how to test. This is a bug IMO. You used my file with the mesh settings already changed for your calculation, not the OP’s.

Finding the lowest and highest points in a surface

Rhino Rhino for Windows

Helvetosaur September 16, 2020, 10:43am 24

OK, I guess I have to do all the work here…

Bug report filed: https://mcneel.myjetbrains.com/youtrack/issue/RH-60470

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Finding the lowest and highest points in a surface

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