Grasshopper

algorithmic modeling for Rhino

Getting the normal from specific point on surface.

Hi all,

 

I'm pretty new to grasshopper and I'm wondering how to get the normal at a specific point of the surface, if I only know the x,y,z coordinates of that point. It seems easy to determine the normal if i know the UV of the point, but I'm unable to find a function that can return the UV value just based on the x.y,z coordinates.

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Replies to This Discussion

Permalink Reply by Matt Harrisson on March 25, 2011 at 1:10am

Hi Raymond,

 

If you know the xyz coordinates you can do it this way. Use [SurfaceCP] to project your point onto the surface then [EvalSurface] at the point.

 

Matt.

 

 

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