Rhino generated mesh (.stl) relaxed in Kangaroo --> Convert to NURB surface?

Hi,

I generated a mesh with rhino from a very basic NURB geometry.

Although, I have intersecting cylinders and plans, so Rhino is clearly giving me a QUAD + TRI mesh. I refined my mesh with Weaverbird as recommended D. Piker.

I then relaxed it using Grasshopper + Kangaroo and obtained a nice smooth mesh (entirely triangulated from weaverbird).

But the problems start now...

I am trying to get a NURB surface out of my mesh in order to extract the some geodesic curves out of it... Looked into it and it seems that T-Splines is the way to go... Although apparently T-Splines is not liking my mesh for 2 reasons:

1) it is fully triangulated

2) it is a mesh generated in Rhino (.stl) and T-Splines only deals with .obj. Right?

So, my question is which way to go?

- Is it possible to generate the mesh in C4d (as .obj) and then put it back in Rhino+Gh+Kangaroo and then use T-spline on it? Would it remain an .obj mesh through the whole process?

- Or should I try to get the geodesics another way?

- Or should I get EvoluteTools to remesh it? But would that really help cause I dont even know if the evolute guys are using obj or stl...

Replies to This Discussion

Permalink Reply by Daniel Piker on September 24, 2013 at 2:39am

There are 2 separate issues here - file format and tri-to-quad

File format is the easy part - stl and obj are common formats and can be opened or saved by most appplications.

Going from a triangular mesh to a quad one is a harder process.

As a first approach, I would suggest trying to remodel your initial mesh out of all quads, then subdivide with weaverbird, relax with Kangaroo and convert to NURBS with T-Splines. Remember it only has to be a very coarse initial mesh.

Automatically converting a triangulated mesh to all quads will be more tricky, and would need some additional software.

Permalink Reply by Jeandm on September 24, 2013 at 10:50am

Hi Daniel!

Thank you for the answer.

I found my way around using a very coarse quad mesh and then refining it + relaxing it.

I am having trouble now getting my geodesics as I ended up with a polysurface and to get the geodesics I need one primary surface... So I am investigated, but my primary problem is solved!

Thank you!

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