Isocurve directions

Hello!

Im quite new to grasshopper and was wondering if anybody could help me resolve a current situation in the program.

Im trying to attach rectangles to several points on a surface, but i also want the rectangles to follow the isocurves of the surface rather than following the surface.

Thanks Afshin

Attachments:

Surface.jpg, 1.8 MB

Replies to This Discussion

Permalink Reply by Afshin Ghafoori on January 17, 2014 at 12:41pm

Let me refrase: I want the rectangles to orient its direction from the isocurves rather than the intersection points of the isocurves.

Thanks

Permalink Reply by David Rutten on January 17, 2014 at 1:59pm

The isocurves can intersect at non-90 degree angles. What happens then? Parallelograms? Average angle?

David Rutten

david@mcneel.com

Permalink Reply by Afshin Ghafoori on January 17, 2014 at 3:41pm

Thanks for the reply David.

But i dont think I get it, what do you mean by the average angle? The angles i want is on the x and y axis of the surface.

Permalink Reply by David Rutten on January 17, 2014 at 3:59pm

The angles at which isocurves meet are not necessarily 90 degrees. Rectangles always have 90 degree angles. So what needs to happen when your isocurves are skewed?

David Rutten

david@mcneel.com

Permalink Reply by Hannes Löschke on January 18, 2014 at 1:38am

What David means to say is that there are tons of ways to come up with the concept of "rectangles flowing with the surface UVs". Most of which aren't rectangles any more, because the local UV coordinate system isn't necessarily orthogonal.

The most straight forward way, given your current definition, is to use the frame output of the SurfaceEval component. This returns an orthogonal plane roughly and (hopefully)consistently approximating the UVs at the point.

Permalink Reply by Afshin Ghafoori on January 19, 2014 at 12:13pm

Will try out that component, understand the thoughts. Thanks!

RSS