Hi guys, Im attempting to do a Global Illumination like technique (not really Global Illumination, but something I wanted to try out)

Method

Problem

Yet not being a shader genius but with intermediate knowledge, I'm not sure where to start. I believe what I'm supposed to do is if a normal or vertex has an attenuation or intensity more than 0.01 (or a controllable value) create a ray and perform a ray march from that point and until it hits another normal, subtract the scattering intensity by 0.1 (or a controllable variable) until it becomes 0.

However, using a pixel shader Im not sure how to convert all of that meat generated thoughts into code.

EDIT:
I should note in unity3d, you cannot access shadow maps

You could use something like reflective shadow mapping. http://www.vis.uni-stuttgart.de/~dachsbcn/download/rsm.pdf

Hi, Hodgman

I forgot to state that I need this to be dynamic.

kalle_h

Ive Known about reflective shadow maps but If I were to do that I would need to create my own renderer which for being a minor intermediate shader artist I have no idea on how to do that.

The closest solution I can think of is to somehow expand the Screen Space Ambient Occlusion algorithm to do multiple bounces when tracing. But I think the results will be too affected by the missing offscreen info.

Henning

What about this solution? It's funny because I'm actually working on raymarched screen space reflections as some of you may have seen, but this could be a decent solution if the light bleeding and noise issues can be resolved.

Bart Wronski demostrate temporal supersampling with ssao here.

http://bartwronski.com/2014/04/27/temporal-supersampling-pt-2-ssao-demonstration/

This also work great on screenspace bounce light. In our early access game Hardland we use this kind of technique and its does not even need spatial blurring and its stable. But all screenspace techniques are limited to quite low range.(we use about 2m) so the effect is pretty local even in the best case.

https://www.dropbox.com/s/nnn5amo3edbpbxf/ScreenspaceOcclusion.png?dl=0

https://www.dropbox.com/s/8fdoy3d729o05jd/ScreenspaceOcclusionWithBounceLight.png?dl=0

Bart Wronski demostrate temporal supersampling with ssao here.

http://bartwronski.com/2014/04/27/temporal-supersampling-pt-2-ssao-demonstration/

This also work great on screenspace bounce light. In our early access game Hardland we use this kind of technique and its does not even need spatial blurring and its stable. But all screenspace techniques are limited to quite low range.(we use about 2m) so the effect is pretty local even in the best case.

https://www.dropbox.com/s/nnn5amo3edbpbxf/ScreenspaceOcclusion.png?dl=0

https://www.dropbox.com/s/8fdoy3d729o05jd/ScreenspaceOcclusionWithBounceLight.png?dl=0

Wow, looks pretty good and is easy to integrate. I might even use this idea, thanks! :D