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Displacement tests
Posted: Tue Apr 27, 2010 7:09 pm
by Diogo Moita
Hello guys, how are you?
I was taking a look at old displacement tests Radiance have done with luxrender when I realized that there´s no GPU renderer capable of displacement map. No one. Does anybody knows why GPU doesn´t support displacement?
Re: Displacement tests
Posted: Tue Apr 27, 2010 7:10 pm
by radiance
because they are all young and it takes time to develop such things.
there's also no existing papers about it, and it's quite a difficult thing to adapt to a gpu.
Radiance
Re: Displacement tests
Posted: Tue Apr 27, 2010 7:22 pm
by Diogo Moita
I see. But, in your opinion, do you think it´s possible?
Re: Displacement tests
Posted: Tue Apr 27, 2010 7:37 pm
by vanlicht
It is possible for ATI's card,
they have micro-displacement tech which is practical and not just theory,
applied in another GPU application.
But not on NVidia's card as I know of it...maybe DX11 will change something?
Re: Displacement tests
Posted: Tue Apr 27, 2010 7:55 pm
by Chris
Your are talkling about Hardware Tesselation. Hardware tesselation is a feature wich works with the new Directx 11 api. Directx 11 was first available with Ati cards and are now available with the new Nvidia cards aswell.
The Cuda api have no support for hardware tesselation, and will probaly not have it for a long time if ever.
One render engine with hardware tesselation is Machstudio Pro wich is a biased directx render engine and not a unbiased engine like Octane.
Cheers.
Chris
Re: Displacement tests
Posted: Tue Apr 27, 2010 7:55 pm
by radiance
vanlicht wrote:It is possible for ATI's card,
they have micro-displacement tech which is practical and not just theory,
applied in another GPU application.
But not on NVidia's card as I know of it...maybe DX11 will change something?
these are fixed function pipeline based, eg opengl/directX for games,
the actual hardware is not exposed to the programming interface we use, so we can't use it.
also raytracers work entirely differently so it's not as easy to apply.
Radiance
Re: Displacement tests
Posted: Tue Apr 27, 2010 7:55 pm
by radiance
Chris wrote:Your are talkling about Hardware Tesselation. Hardware tesselation is a function wich works with the new Directx 11 api. Directx 11 was first available with Ati cards and are now available with the new Nvidia cards aswell.
The Cuda api have no support for hardware tesselation, and will probaly not have it for a long time if ever.
One render engine with hardware tesselation is Machstudio Pro wich is a biased directx render engine and not a unbiased engine like Octane.
Cheers.
Chris
you beat me to it
Radiance
Re: Displacement tests
Posted: Tue Apr 27, 2010 8:12 pm
by Chris
Radiance:
Perhaps OpenCL will have support for hardware tesselation sometimes in the future when its mature enough. Who knows, just my thoughts.
Chris
Re: Displacement tests
Posted: Tue Apr 27, 2010 8:20 pm
by vanlicht
Yes, I think Chris' description is much more precise and correct.
Re: Displacement tests
Posted: Tue Apr 27, 2010 8:43 pm
by Diogo Moita
Good explanation! Although these are not so good news hehehe
I´ve seen the displacement video of Mach Studio Pro, I forgot that was on the GPU. The guys from MotivaCG are preparing something very similar on COLIMO, but they use CUDA! Maybe a light at the end of the tunel?