Extruding curves perpendicular to a warped surface

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Permalink Reply by Benjamin Golder on March 4, 2012 at 3:08pm

you can use 'Evaluate Surface' to get the normal vector (the vector perpendicular to a point on a surface) of a certain uv point on a surface. You can then use this normal vector to extrude something perpendicular to the surface.

You'll need to get the uv coordinates of all the points where you want to extrude from. In the case shown in the picture, you'll probably want to get the uv coordinate and normal at every corner point of every hexagon cell. Otherwise the edges won't match up.

Permalink Reply by victor velarde on March 4, 2012 at 3:15pm

BG,

How can I get the uv coordinates of all the points? 

v.

Permalink Reply by Benjamin Golder on March 5, 2012 at 3:40am

You can use Closest Point on Surface/BRep if you projected the curves. But depending on how you made your hex-cell geometry, there might be easier ways to get the UV information.

Permalink Reply by gilberto on December 22, 2016 at 4:53pm

Hi Benjamin

I am trying to do something similar

I want to extrude closed curves that have been pulled onto a surface

i want to extrude them along the normals of the surface which i have done but i just dont know how to set the length of the extrusion.

usually when i extrude along a vector i input a slider into the unit x/y/z but in this case my vector is the frame output of evalsrf

so how can i set that length?

also in order to do the job (which would actually be boolean difference the first surface and the extruded surfaces) the extrusion has to go from a negative to a positive value so it goes out the main surface..

thanks in advance.