dabroz.scythe.pl

It's frustrating. I coded this sample about month ago. But the very next day I've upgraded my system to 64-bit Windows 7 and my raytracer magically refused to work. Finally I've got some time to fix it and post.

Basically it's the same demo that NVidia's using to promote OptiX. First of all, you can run OptiX samples on GeForce cards (not only QuadroFX) by disabling video card name check (very sneaky, NVidia!). So did I. And NVidia sample was running at 3-4 FPS, but it needs a lot of frames to produce final results (it's simillar to progressive JPEG). On the other hand, my very simple raytracer coded in CUDA easily hits VSync (60 FPS) using higher resolution and instant multisampling. Sure, my raytraces is not pixel accurate with OptiX, but its a matter of setting lights, objects positions and other stuff. And why does OptiX perform so bad? I have no idea.

You will probably have a lot of problem running these demos (I have no luck with release builds). But if you have Visual Studio and CUDA SDK you have chances. x86 build runs fine on 32bit Windows XP. x64 build runs on 64-bit Windows 7 (and probably Vista). Visuals in x64 versions are somewhat different from image in my post, because I needed to backport some code.

• x64
• x86

PS. I love 7 driver model. NVidia drivers (191.07 in my case) are still very buggy (or rather unstable) when running CUDA code, and automatic driver restart is much better than total system crash.

PS2. I'll try to find some more time and finally post my OpenGL 3.2 multisample demo source code.