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Ray

 
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Linker



Joined: 06 Nov 2006
Posts: 29
Location: Almaty, Kazakhstan

PostPosted: Sat Jun 02, 2007 11:40 am    Post subject: Ray Reply with quote

Hello everyone.

I would like to have my project hosted here.
Ray is a library for your everyday 3D graphics needs.

Regards,
Linker
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h3r3tic



Joined: 30 Mar 2004
Posts: 261
Location: Torun, Poland

PostPosted: Sat Jun 02, 2007 5:32 pm    Post subject: Reply with quote

Can it do PRT? Razz
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Linker



Joined: 06 Nov 2006
Posts: 29
Location: Almaty, Kazakhstan

PostPosted: Sun Jun 03, 2007 10:23 am    Post subject: Reply with quote

h3r3tic wrote:
Can it do PRT? Razz

Nope. Currently, I'm working on mesh simplification and clustering. Laughing
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h3r3tic



Joined: 30 Mar 2004
Posts: 261
Location: Torun, Poland

PostPosted: Sun Jun 03, 2007 10:34 am    Post subject: Reply with quote

Yeey that's cool too Smile Which algorithms? I'm myself looking forward to implementing quadric error metrics. (or letting someone on my team implement them)
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Linker



Joined: 06 Nov 2006
Posts: 29
Location: Almaty, Kazakhstan

PostPosted: Mon Jun 04, 2007 11:50 am    Post subject: Reply with quote

As of current, it's QEM with half-edge data structure. It's pretty buggy (= only handles 2-manifolds without boundaries), so I'm rewriting it to something more useable. Smile Yes, and it's really slow, because I was lame enough to re-heapify candidates after each decimation step. Cool
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h3r3tic



Joined: 30 Mar 2004
Posts: 261
Location: Torun, Poland

PostPosted: Mon Jun 04, 2007 12:05 pm    Post subject: Reply with quote

w00t! QEM Very Happy I wants.
I've also coded some basics of a half-edge data structure. I think it even had the ECOL/VSPLIT operations, but nothing more than that :}
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Linker



Joined: 06 Nov 2006
Posts: 29
Location: Almaty, Kazakhstan

PostPosted: Mon Jun 04, 2007 12:50 pm    Post subject: Reply with quote

I think that I'll finish rewriting in a couple of weeks. Smile If I have the time, it'll be ready by the end of this week.
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h3r3tic



Joined: 30 Mar 2004
Posts: 261
Location: Torun, Poland

PostPosted: Mon Jun 04, 2007 1:02 pm    Post subject: Reply with quote

Awesome! Smile Maybe I'll be able to help you out later.
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brad
Site Admin


Joined: 22 Feb 2004
Posts: 490
Location: Atlanta, GA USA

PostPosted: Mon Jun 04, 2007 6:57 pm    Post subject: Reply with quote

Linker,

I suck. Sorry it took so long. Everything is set. Let me know if you have any questions.

BA
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h3r3tic



Joined: 30 Mar 2004
Posts: 261
Location: Torun, Poland

PostPosted: Tue Jun 05, 2007 4:14 pm    Post subject: Reply with quote

Hmmm have you got any plans for handling non manifold meshes in any way? I'm not sure what should be done for them. Should the LoD algo try to cap them by doing some sort of voxelization? Or should just the error metric be modified in a way that allows non manifold topologies?
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Linker



Joined: 06 Nov 2006
Posts: 29
Location: Almaty, Kazakhstan

PostPosted: Thu Jun 07, 2007 12:24 pm    Post subject: Reply with quote

Big thanks for setting it all up, brad.

Quote:

Hmmm have you got any plans for handling non manifold meshes in any way? I'm not sure what should be done for them. Should the LoD algo try to cap them by doing some sort of voxelization? Or should just the error metric be modified in a way that allows non manifold topologies?

Well, it's not the EM but connectivity data structure that's causing trouble; QEM, for example, measures geometrical deviation from original surface (kinda smart words Very Happy). And about non-manifolds... Basically, you trade processing speed and simplicity for generality. Garland's scheme does handle non-manifold meshes, by using 'virtual' edges; there're many techniques doing actually the same, but I'm not going to support non-manifold meshes unless anybody can 'convince' me to do so. Smile By the way, the structures I use allow for some degree of 'non-manifoldness'.
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