Problems about CPMesh

Replies to This Discussion

Permalink Reply by Alexander Schiftner on February 20, 2014 at 1:39am

Hi there, circle packing mesh optimization may also be performed using this freely available tool, it is the original code that was used for Mathias Hobinger's Master Thesis: http://www.evolute.at/software-en/evolutetools-for-rhino/evolutetoo...

Permalink Reply by Daniel Piker on February 20, 2014 at 3:18am

Hi,

The circle packing optimization will adjust the vertices of any mesh towards having the tangent incircle property, but your starting mesh only has 12 vertices (it also had an internal non-manifold face, which had to be removed). So I ran the remeshing tool on it to get a larger number of fairly even triangles as a starting point.

Presumably you want to keep close to the original geometry, so I added a pull to mesh force, and pulled the boundary points towards the mesh boundary curve (letting them slide instead of fixing them in place completely).

You could also work from a subdivision mesh starting point if you wanted a different topology.

I hope that helps,

Daniel

Attachments:

• cp_mesh1.gh, 42 KB

Permalink Reply by maajor on February 20, 2014 at 3:44am

Thanks a lot Daniel! It's really a great help to me!

Permalink Reply by JS on February 21, 2014 at 3:46pm

What does it mean when the kangaroo physics engine says "object reference is not set to an instance of an object?"

Permalink Reply by Daniel Piker on February 21, 2014 at 4:24pm

It depends - this error doesn't tell us much, but it often relates to not all particles getting properly initialized, or the forces not having been updated.

If you share your definition I can take a look though.

Permalink Reply by JS on February 21, 2014 at 6:27pm

Hi Daniel, the definition is actually the cp mesh1 you posted above! I'm running the latest version of grasshopper and kangaroo.

Permalink Reply by maajor on February 22, 2014 at 1:32am

Hi JS, I encountered the same problem at first. Probably you need to check the "RestLengthFactor" input of "SpringsFromMesh". It should be 1 rather than "null".(Or 0, Daniel?I dont's quite understand)

I think it is a bug of grasshopper, I set it to 1 and resave and reload and it becomes null. 

Good luck!

Permalink Reply by JS on February 22, 2014 at 6:23am

Thanks it works! I'll keep this in mind if I run into this error again.

Permalink Reply by Daniel Piker on February 20, 2014 at 3:40am

You could also actually even do the remeshing and optimization simultaneously, using the tool I posted here:

http://www.grasshopper3d.com/group/plankton/forum/topics/dynamic-re...

Attachments:

• Plankton_Kangaroo_CPMesh.gh, 13 KB

Permalink Reply by Daniel Piker on February 20, 2014 at 4:28am

sorry - forgot to include the input mesh. Here's the re-saved file:

Attachments:

• Plankton_Kangaroo_CPMesh.gh, 20 KB