Grasshopper

algorithmic modeling for Rhino

Creating site topography by offsetting?

Hi guys,

Im still getting the hang of grasshopper but i wonder if someone could point me in the right direction. I have a map of a site im currently working on, however the only contour information I can get hold of are at 5 meter intervals. I was wandering if there was a way of taking one of the inside contours and offsetting that to meet the next outer line of the contour.

For example if I had a circle within a square. I want to offset the circle eight times. But with each offset the circle begins to become slightly more square. Does this make sense? I was wondering if there is perhaps a tutorial or a simple way to do this, or even a technical term that i can search through the forum for. Many thanks!

Views: 558

Replies to This Discussion

Permalink Reply by mire on November 28, 2014 at 3:12am

Hi daneng, one way to do this:

-move the curves up to their right z location

-make a surface or a mesh out of the curves; there are several ways to do this based on how your curves are, you can try "patch" component.

-use "contour" component on the surface with "z" as direction to get as many curves as you like

-project the curves back to xy plane

Permalink Reply by danedg on November 28, 2014 at 5:21am

Thanks mire! I will give it a go! 

Permalink Reply by David Stasiuk on November 28, 2014 at 3:16am

You can try using Tween curves, but sorting and matching the curves may be problematic.

Permalink Reply by danedg on November 28, 2014 at 5:21am

Thankyou David I've not heard of tween curves before, I'll have a look into it.

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