Hardware-Accelerated Global Illumination by Image Space Photon Mapping

Image Space Photon Mapping (ISPM) rasterizes a light-space bounce map of emitted photons surviving initial-bounce Russian roulette sampling on a GPU. It then traces photons conventionally on the CPU. Traditional photon mapping estimates final radiance by gathering photons from a k-d tree. ISPM instead scatters indirect illumination by rasterizing an array of photon volumes. Each volume bounds a filter kernel based on the a priori probability density of each photon path. These two steps exploit the fact that initial path segments from point lights and final ones into a pinhole camera each have a common center of projection. An optional step uses joint bilateral upsampling of irradiance to reduce the fill requirements of rasterizing photon volumes. ISPM preserves the accurate and physically-based nature of photon mapping, supports arbitrary BSDFs, and captures both high- and low-frequency illumination effects such as caustics and diffuse color interreflection.

An implementation on a consumer GPU and 8-core CPU renders high-quality global illumination at up to 26 Hz at HD (1920x1080) resolution, for complex scenes containing moving objects and lights.

More info and resources:
http://bit.ly/97S42G

Category:

Gaming

Tags:

• Global
• Illumination
• ISPM
• real
• time

[Capeau]

bad shadows, looks like its all floating

[BCEMCOCATb]

@Capeau it is not about shadows or polygons or artistic look. It is a technical demonstration of HA Global Illumination implementation.

[TrickyEmu]

Really only 26 Hz? Or do you mean GHz? That sounds more realistic.

[BCEMCOCATb]

@TrickyEmu You probably are confusing it with CPU or GPU clocks. 26 Hz is a refresh rate, in other words FPS.

[Phygar1]

You planning on licensing this in the future? Can I expect to be seeing your engine in games?

[BCEMCOCATb]

@Phygar1, I am just an uploader. There's a link to their official site in info to this video.

[xalener]

Natural selection 2 assets? wait, is this tech in NS2?

[HeartAttack1990]

With direct illumination only, this looks a whole darn lot like Doom 3.

[phoenix13nl]

@mrJv2k7

Correct me if I'm wrong, but I believe this is what AO is trying to approximate.

[mrJv2k7]

cool! throw in some AO and bigger textures and you've got a winner :D

[DanFrederiksen]

not bad. I have this hunch that spread out light is better handled as propagated folded geometry. as opposed to sampling/photon scatter. but it might not be faster

[Kiliankoe]

This is extremely cool! Great demo

[dron48]

ахахахахаха, чувак, стелишь!

[Zakum90]

Amazing Idea, well done!

Вы профессионалы, или любители?