Shrink Wrap with Kangaroo

This definition approximates a shrink wrap for generic brep geometry.

There are two steps:

The first step creates a mesh from a bounding box and drags each vertex to the closest point on the brep. Andrew Heumann offered a similar definition back in December (http://www.grasshopper3d.com/video/shrinkwrap-with-grasshopper?xg_s...)

The second step takes the original vertices of the mesh and treats them as anchor points (since they are now 'attached' to the geometry). The mesh is then triangulated and subdivided and a pressure value is placed on the new faces with Kangaroo.

Uses Kangaroo and Weaverbird. This is still in development, so please let me know about any issues with the definition.

Video: http://www.grasshopper3d.com/video/shrink-wrap-with-grasshopper-and...

Files:

ShrinkWrap.3dm

ShrinkWrap.gh

Tags: Kangaroo, Pressure, Relaxation, Shrink, Surface, Wrap

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Comment by Jørn Lambertsen on January 31, 2012 at 4:40pm: The simple one worked really perfectly for me! But the Kangaroo version seems to have a lot of issues with the Weaverbird components, I can only get it to work (somewhat) when I bypass those... Is there some kind of conflict between WB and the newest build of Grasshopper, it keeps giving me 'invalid meshes'? (I use 0.8.0066)... (Well, I might also just be doing something wrong, it is a slightly complicated definition... for me anyway! :)

Comment by Erick Katzenstein on November 4, 2011 at 7:24am: Daniel,

If you're dealing with orthogonal surfaces, you could probably isolate the interior surfaces and then use this definition on that...and then the inflation can be done by making the pressure level positive.

As I see it, this would be difficult to set up for generic geometry. I think you would have to develop a way to make an inscribed bounding box, which would require a hollowed structure.

I think a more physically accurate shrink wrap can be developed with kangaroo, where you can put the shrink wrap on the inside or outside surfaces, but as of now, the brep collision properties aren't working as rigidly as we would need it to.

Comment by ryles on November 1, 2011 at 10:26am: thank you for sharing!

Comment by daniel koene on October 31, 2011 at 1:00am: can this shrink wrap be done in reverse? so it inflates into a shape but deforms when colliding with the shape. for example a sphere in a box.