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Sample demonstrating simultaneous Morphing and Skinning

 
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ReJ



Joined: 04 Apr 2004
Posts: 25
Location: Lithuania, Vilnius
PostPosted: Thu Oct 13, 2005 6:39 am    Post subject: Sample demonstrating simultaneous Morphing and Skinning Reply with quote
Hi,


I've tried out the idea, earlier raised by chp http://forums.ps2dev.org/viewtopic.php?p=21122#21122, that both morphing and skinning can be combined on psp GPU.
And guess what?... It actually works :) Several blend targets can be first lerped together and then matrix skinning can be applied to resulting vertex. Here is the sample demonstrating the technique in action:
http://rej.50megs.com/psp/morphskin

This feature enables usage of sophisticated animation of texture coords, vertex color animation, geometry morph-targets along with skinning. As well some matrix skinning problems can be fixed (like elbows) using patches with applied morph targets - if anyone ever would care about that on psp ;)
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jsgf



Joined: 12 Jul 2005
Posts: 254
PostPosted: Thu Oct 13, 2005 11:11 am    Post subject: Re: Sample demonstrating simultaneous Morphing and Skinning Reply with quote
ReJ wrote:
I've tried out the idea, earlier raised by chp http://forums.ps2dev.org/viewtopic.php?p=21122#21122, that both morphing and skinning can be combined on psp GPU.
And guess what?... It actually works :)


Cool, I've been meaning to try this out. Do all the vertex attributes get interpolated by morping? Hm, I see at least vertex and colour; I guess texcoords, weights and normals too.

But, oof, the performance seems slow. Must really be hitting the GE hard.
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ReJ



Joined: 04 Apr 2004
Posts: 25
Location: Lithuania, Vilnius
PostPosted: Thu Oct 13, 2005 3:38 pm    Post subject: Re: Sample demonstrating simultaneous Morphing and Skinning Reply with quote
ReJ wrote:
I've tried out the idea, earlier raised by chp http://forums.ps2dev.org/viewtopic.php?p=21122#21122, that both morphing and skinning can be combined on psp GPU.
And guess what?... It actually works :)


jsgf wrote:
Cool, I've been meaning to try this out. Do all the vertex attributes get interpolated by morping? Hm, I see at least vertex and colour; I guess texcoords, weights and normals too.

Yes, all vertex attributes are interpolated by morphing.

jsgf wrote:
But, oof, the performance seems slow. Must really be hitting the GE hard.


It is 9216 vertices, 2 morph targets and 8 bones per vertex. And vertices in the sample are huge - 68bytes. Lots of work for GE.

I'll do a bit of performance testing with different number of bones and morph targets later on.
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