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Jeroen
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Joined: 07 Aug 2004
Posts: 5332
Location: The Netherlands
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 Posted: Thu May 17, 2007 5:21 pm Post subject: Subdivision function |
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People want subdivision in DeleD so... you ask, we deliver.  I'm working on subdivision right now. Early screens:
Original object (created using the new Lathe function) on the left: 324 polygons
After one subdivision: 1272 polygons
After a second subdivision: 5088 polygons
I really like playing with the combination of Lathe and Subdivision! 
Original object on the left: 22 polygons
After one subdivision: 88 polygons
After a second subdivision: 352 polygons
Still got some work to do but subdivision will be available in the next DeleD PRO version (1.7).  |
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Daaark
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Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Thu May 17, 2007 5:44 pm Post subject: |
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Very nice.
The jumps seem to be huge. You can't just double the polycount, instead of 4x? (All modellers do this, nothing against your implementation)
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Jeroen
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| Posted: Thu May 17, 2007 5:46 pm Post subject: |
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| Daaark wrote: |
Very nice.
The jumps seem to be huge. You can't just double the polycount, instead of 4x? (All modellers do this, nothing against your implementation) |
That depends on what subdivision scheme is being used. I've used Catmull-Clark subdivision which roughly generates 4 polygons for each vertex in the original object. Most other subdivision scheme's produce a more or less simular result. Doubling the polygon... I wonder which subdivision scheme comes close to that... Do you know?
Edit: I actually think more refinement is possible by merging polygons after applying the subdivision. I might just investigate that too... perhaps... |
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Mr.Fletcher
DeleD PRO user
Joined: 07 Aug 2004
Posts: 1772
Location: Germany
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| Posted: Thu May 17, 2007 5:55 pm Post subject: |
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That looks brilliant!
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Daaark
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Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Thu May 17, 2007 6:13 pm Post subject: |
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| Jeroen wrote: |
| Edit: I actually think more refinement is possible by merging polygons after applying the subdivision. I might just investigate that too... perhaps... |
No need, I was just curious.
Does this only work on quads?
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Jeroen
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Location: The Netherlands
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| Posted: Thu May 17, 2007 7:04 pm Post subject: |
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| Daaark wrote: |
Does this only work on quads? |
Nope, it works on arbitrary meshes so triangulated meshes are no problem either. The algorithm does produce quads only though. |
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jwatte
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Joined: 26 Apr 2006
Posts: 513
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| Posted: Fri May 18, 2007 12:06 am Post subject: |
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| Now, if there was a good "optimize" button to un-subdivide too :-) |
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Jeroen
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Location: The Netherlands
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| Posted: Fri May 18, 2007 5:53 am Post subject: |
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| jwatte wrote: |
| Now, if there was a good "optimize" button to un-subdivide too |
Yes, I've been thinking about that as I've seen that in other modellers too. I wonder... could an arbitrary object that hasn't been subdivided yet be un-subdivided? Interesting stuff... |
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Vijchti
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Joined: 16 Aug 2006
Posts: 250
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| Posted: Fri May 18, 2007 7:54 am Post subject: |
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...It's like you know exactly how to turn me on.
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Jeroen
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Joined: 07 Aug 2004
Posts: 5332
Location: The Netherlands
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| Posted: Sun May 20, 2007 1:04 pm Post subject: |
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I finished up the subdividing routines (for now anyway ) and implemented another subdividing scheme: Doo-Sabin. Take a look:
Left object: original
Middle object: Catmull-Clark subdivision applied one time
Right object: Doo-Sabin subdivision applied one time
Left object: original
Middle object: Catmull-Clark subdivision applied two times
Right object: Doo-Sabin subdivision applied two times
As you can see, the Catmull-Clark scheme produces a slightly rounder object while Doo-Sabin follows the curves of the original object a little more. Both ways have their uses, of course. Amount of polygons in both subdivided objects is almost the same.
The smoothing algorithms are found in the Lowpolygon Command frame (although you can hardly call this lowpolygon anymore  ) and can be used in the PRO version. |
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granada
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Joined: 07 Aug 2004
Posts: 1955
Location: England
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| Posted: Sun May 20, 2007 5:29 pm Post subject: |
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Cool, nice work there jeroen .
Dave
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Daaark
DeleD PRO user
Joined: 01 Sep 2004
Posts: 2696
Location: Ottawa, Canada
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| Posted: Wed May 23, 2007 4:01 pm Post subject: |
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Are texture cordinates maintained?
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espritcool
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Jeroen
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Posts: 5332
Location: The Netherlands
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| Posted: Wed May 23, 2007 6:43 pm Post subject: |
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Texture coordinates are recalculated because additional vertices are inserted.
If your object can still be cut into convex pieces, I see no reason why the Torque exporter (and Torque itself) wouldn't like those objects. |
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jwatte
DeleD PRO user
Joined: 26 Apr 2006
Posts: 513
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| Posted: Wed May 23, 2007 9:47 pm Post subject: |
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| Quote: |
| Texture coordinates are recalculated |
The right thing to do is probably to generate texture coordinates for the new vertices using barycentric interpolation of the old vertices on the edge (or face) being split. |
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