Real Time Ray Tracing with GLSL @GameCoder

Real Time Ray Tracing with GLSL 35-60 FPS GeForce 9800 gs

Reflection
Refraction
Fresnel
Shadow

Category:

Science & Technology

Tags:

• Real
• Time
• Ray
• Tracing
• with
• GLSL
• GeForce
• 9800
• gs
• gamecoder

[Robosos]

nice, but lol, 3 fps for say... 6 spheres, this is not a good performance for 400 or more GFLOPS -> fail :/

better do raytracing on the CPU plz, there you have a better cache and a much better jump prediction

[msclecram]

@Robosos 3 fps ? : "Real Time Ray Tracing with GLSL 35-60 FPS GeForce 9800 gs"

I uploaded the video because i programmed the raytracing with GLSL, this give you chance of mix a standar raster or deferred rendering with raytracing in the same scene with the same api.

With OpenCL you can make a very fast RayTracing, OpenCL is a robust lenguaje ( GLSL no ).

My GPU have 64 cores, a standar CPU have 2 or 4 cores and a raytracing is a parallelizable algorithm ...... :)

[Robosos]

@msclecram

but notice the difference of the GPU/CPU bandwidth (cpu:20-30 gb/s, gpu:50-100GB/s), for a good GPU utilisation you need a good coalisation (what for polygon scenes isn't the case), its not only a CPU vs GPU "core" count battle, its about memory efficieny and prefetching and so on.

Raytracing don't map good to current GPU's...

We can talk more about that _if_ u have an polygon implementation (of course with a BVH algorithm)

[msclecram]

@Robosos ah, forget this talk

With a good ray tracing ( like BVH ) algorithm you dont have that problem, with cuda or OpenCL you can make a good implementation of ray tracing with a mesh.

Just try to find a good real time ray tracing with a standar cpu.

I have the same code of my ray tracing in the cpu, and the scene take ~40 seconds in the cpu.

Search Nvidia Optix if you want ( vs cpu ray tracing ), nvidia optix run in a standar gpu.

[evillllll1]

You should turn this into a Minecraft mod.

[domsau2]

Mountains are pre-rendered with Terragen.

[Robosos]

@msclecram lol, 40 seconds, try to optimize it (i mean write assembly) with SSE and use many cores, then its fast as hell.