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From: bemfarmer
Max, do you have a link to the algorithm?
I came across this:
http://www.cl.cam.ac.uk/techreports/UCAM-CL-TR-773.pdf
Thank you,
- Brian
From: Max Smirnov (SMIRNOV)
Hi Brian!
I've read a lot of documents about this. The most interesting is:
http://www.dgp.toronto.edu/people/stam/reality/Research/pdf/cc.pdf
http://research.microsoft.com/en-us/um/people/cloop/qteg.pdf
http://www.eecs.berkeley.edu/~sohamum/files/cs284_f12_project_report.pdf
From: Michael Gibson
Hi Max, the difficulty comes with the "extraordinary vertices" - vertices where other than 4 edges are coming off of it.
The subdivision surface behaves somewhat differently in those areas and those are the problematic parts to put NURBS surfaces on.
- Michael
From: Max Smirnov (SMIRNOV)
Hi Michael.
I am not confident of success, but I'll try to implement Jos Stam's method of calculating the surface exactly.
----
[added] open mesh support
From: Michael Gibson
Hi Max,
> I am not confident of success, but I'll try to implement Jos Stam's
> method of calculating the surface exactly.
Ok, but evaluating the subdivision surface exactly does not really solve the problem of conversion of the surface into a different form...
I think what you will end up finding is that regular areas of the mesh will convert quite nicely but that there will be difficulties in the areas of extraordinary vertices.
But I'm looking forward to seeing what you come up with anyway! :)
- Michael
From: BurrMan
Michael,
Could the "extraordinary vertices" be easily identified beforehand? This tool, even if there were parts that had to be "left out", would be very cool. Then using other tools to handle the extraordinary part...
From: Michael Gibson
Hi Burr, yeah the extraordinary vertices are pretty easy to identify, they're just vertices where there is some other number than 4 edges coming off of the vertex, see here:
http://www.multires.caltech.edu/teaching/courses/subdivision/intro/sld012.htm
- Michael
From: Max Smirnov (SMIRNOV)
This is early beta version of my subdiv script. I'll add more features later. High precision mode (for extra smoothing around an extraordinary vertices), per edge sharpness, and more. Script supports 3- 4- and 5-sided polygons.
From: bemfarmer
Hi Max, Which scheme are you using?
http://www.holmes3d.net/graphics/subdivision/
Is it going from Nurbs to Nurbs or ?
- Brian
From: Max Smirnov (SMIRNOV)
Hi Brian, I using this one
Fast Parallel Construction of Smooth Surfaces from Meshes with Tri/Quad/Pent Facets
A. Myles and T. Ni and J. Peters
https://www.cise.ufl.edu/research/SurfLab/papers/08poly.pdf
It can use any solid object with flat faces, which can be created in MoI, or imported using my importobj script.
P.S. Also you can read this document: Smooth Surfaces from 4-sided Facets
T. L. Ni, Y. Yeo, A. Myles, V. Goel and J. Peters.
From: BurrMan
Wow Max..... Wow.
Your importobj script? Did I miss that one or is it part of this project?
From: DannyT (DANTAS)
I second that Wow!
-
From: Max Smirnov (SMIRNOV)
Ops.. I forget to share it here :)
Yes, I wrote it as a part of this project, but it can be used separately.
From: Michael Gibson
Really cool stuff Max!
- Michael
From: Max Smirnov (SMIRNOV)
Thank you Michael.
I still having an issues with extraordinary vertices because I didn't finished with Pm-Patches yet. I hope it will be really cool but a little bit later :)
I plan to release a stable beta at weekend.
From: Frenchy Pilou (PILOU)
Sorry where is the Subdiv command ?
It's the one you want release this weekend ?
From: Max Smirnov (SMIRNOV)
At this moment subdiv script is not ready for public release. Wait a few days. :)
From: Frenchy Pilou (PILOU)
Ok Cool! Thx for the info!
From: amur (STEFAN)
Really amazing Max!
Best regards
Stefan
From: PaQ
Hi Max,
Hope their will be a little 'donate' button somewhere so we can buy you a drink or something :)
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