contouring a surface with graph mapper

This might be a stupid question but i'm new to grasshopper...

I am trying to contour a surface and have the distance between contours be affected by a graph mapper - meaning a kind of gradient contour along the surface.

Unfortunately I think i might be missing something elementary in order to do this.

does anyone know or can share an example of something similar to this?

Thanks

Replies to This Discussion

Permalink Reply by Michael Pryor on February 17, 2013 at 8:15am

upload what you have so far

Permalink Reply by Sturley Kraklite on February 17, 2013 at 8:33am

I seem to have no control over the division of the surface - i would like to know what are the basic parameters i should be editing. What i want to get is a denser division on the sides and less division in the center

Permalink Reply by Hannes Löschke on February 17, 2013 at 9:39am

hmmm... I'm not sure whether Countour is actually what you would use. For your example IsoCurves seem to be the more convenient choice since contour needs a direction to work and IsoCurves is always oriented along the surface.

Attachments:

Isocurves_graphmapper.gh, 3 KB

Permalink Reply by Sturley Kraklite on February 17, 2013 at 10:10am

Thanks Hannes!

This really helps!

The reason I originally tried Contour was that I was thinking later on of extracting these section curves from a polysurface.

would it be easier to just project the IsoCurves onto the polysurface instead?

(hope I'm clear...)

Permalink Reply by Hannes Löschke on February 17, 2013 at 10:40am

Nope, IsoCurves are bound to the shape of the surface. So the same U value would be at different distances from the surface edge.

Contour is made to get you a simple map style elevation contours. For variable heights, you can create it on your own with a set of planes moved in z according to your desired spacing and intersecting geometry with PBX (PlaneBRepIntersection).

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