Evaluate Surface

Hello everyone,

I was exploring the evaluate surface component. It seems to work fine when we create a point in GH. But when we use a point from Rhino, it is not created on the surface. What am I missing here?

The image below shows how the point is created far away from the surface.

Same situation with curved surface.

Thank you :)

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Permalink Reply by Chris Wilkins on February 22, 2010 at 12:04pm

Try right clicking the S input on the Evaluate component and turning Reparameterize on, which will make the UV domains of your surface go from 0 to 1. Then use points that are in that range (from 0 to 1). Or you can use the MD Slider to make points that way also.

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Permalink Reply by Deepthi on February 22, 2010 at 2:23pm

Thanks Chris! :)

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Permalink Reply by Damien Alomar on February 22, 2010 at 1:10pm

The Evaluate surface component does not evaluate points, it evaluates UV space. Basically, you have to translate that point into some sort of UV information in order for the results of that component to mean anything. Use the Surface Close Point component to find the UV parameters for the closest point, then feed that into the Evaluate surface component to get the frame and normal.