Shrink wrapping a mesh with Kangaroo.

Replies to This Discussion

Permalink Reply by Daniel Piker on November 25, 2012 at 2:01pm

Hi Alex,

You've posted just the Rhino lock file (.rhl), not the actual 3dm

Permalink Reply by Daniel Piker on November 25, 2012 at 2:06pm

I tested your gh definition with a simple mesh I just created in Rhino, and it works fine, so I'm guessing that the problem is that your input is not a closed mesh.

Try running the MeshRepair>CheckMesh command on it in Rhino

Permalink Reply by Alex Woolgar on November 25, 2012 at 2:07pm

Ah, sorry about that.

Been playing around with it, saying the mesh is not a solid. Is there a way I can make it solid?

Attachments:

• POPCORN_ShrinkWrap2.3dm, 291 KB
• POPCORN_ShrinkWrap.gh, 14 KB

Permalink Reply by Daniel Piker on November 25, 2012 at 2:25pm

The Rhino command 'FillMeshHoles' will do it.

However, it is also possible to alter the grasshopper definition so it doesn't require a closed mesh. (See the attached)

(and this is one of the things that shrinkwrapping is sometimes useful for - not all meshes can be easily fixed if they have lots of non-manifold edges, so shrinkwrapping it can be an easier way of getting a properly closed solid for 3d printing etc.)

Attachments:

• POPCORN_ShrinkWrap2.gh, 10 KB

Permalink Reply by Alex Woolgar on November 25, 2012 at 2:37pm

Awesome, thanks for your help Dan. 

Permalink Reply by Alex Woolgar on November 26, 2012 at 4:54am

Hi - sorry to be a pain. I'm still trying to get this right but not having much luck at the moment. The shrink wrap seems to wrapping inside the mesh and not forming around the outside? Is it something to do with the rest length and cut off of the springs?

Once I have managed to get this bit right I want to shrink wrap lots of copies of the mesh to form one big wrap - any idea how I can do this as at the moment when I copy the mesh in rhino and then set multiple meshes in grasshopper the wrap completely ignores the second mesh.

Hope that makes sense.

Thanks,

Alex

Permalink Reply by Christian D on February 5, 2013 at 9:05am

@alex: make the mesh fit the model more similar in size and you should get a  result as daniel did (at least I did). That worked for me, had the same issue with my first test.

------

One more question: Is there a good way to adjust the behavior to retain some sharper edges somehow? Like if you'd rebuild a pyramid or anything else with sharp edges that you'd want to see more strongly. I played with the settings for some other models before shrinkwraping, but sometimes it wouldn't really work out nicely..

When i increased the "wraps" mesh's density further, giving it more "parts" in the hope of less overall smoothing compared to the original model, usually the whole model would get messed up, although I kept changing some of the Kangaroo Settings Comp. options to counter it somehow.

( But in general to have it said - pretty cool - !! :-)

Permalink Reply by Puree on February 21, 2018 at 1:00am

If wanna to reverse the wap ex.pull out form object Can this scrpit do like this?