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 (old):

ShrinkWrap.3dm

ShrinkWrap(old).gh

Update (03232014):

Here's an updated file which will work with the current version of Kangaroo. This definition also uses UTO's Mesh Tools. Use the same 3DM as above and let me know if you run into any issues.

ShrinkWrap-032314.gh

Comment

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Comment by Wei on May 11, 2012 at 7:05pm: some parts of the grasshopper cannot see clearly. I find it hard to figure out. Can you share the grasshopper file here? Thank you !

Comment by Erick Katzenstein on May 5, 2012 at 7:11pm: The mesh is probably not baking because it's invalid (see posts below). If you update to the newest version of Weaverbird, it should work.

Comment by Maira Khan on May 5, 2012 at 5:10pm: Thanx Erick,

would the results be same if the brep to be wrapped is a set of geometries imported from 3dsmax or sketchup???

also....... is it just my system or the eventual wrap can not be baked?

Comment by Erick Katzenstein on May 5, 2012 at 12:09pm: Meria,

The negative pressure is the only function right now that makes the wrap tighter. Since the bounding box is connecting to the nearest point on the geometry, the wrap will not attach to concave surfaces. You could try to subdivide the mesh again and then drag the new vertices to the surface, but that may get a little complicated.

Comment by Maira Khan on May 5, 2012 at 9:10am: great share.... thanks

Comment by Jørn Lambertsen on February 5, 2012 at 6:53am: Yes! My version of Weaverbird wasn't updated, It works fine now, thank you!

Comment by Jørn Lambertsen on February 3, 2012 at 2:06am: I might have an old version of WB... I'll try to update and see if that works... Thanks:)

Comment by Erick Katzenstein on February 1, 2012 at 9:31am: Jorn,

I had an issue with invalid meshes in the previous version of Weaverbird. Have you updated to most recent?

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.