Horde3D

Hi!

I am currently working on a Lightshaft shader made with horde3D. It looks like this:



The code is not final, but I still put a preliminary version of it on my blog at http://probesys.blogspot.com/

Does anyone have made a similar shader or have any comments or improvement suggestion?

I don't have any technical advice, I just wanted to say that it is nice to see this being done with Horde3D

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Paul

Very nice effect -- but I'm guessing that with 100 samples per pixel it's probably quite expensive?

Perhaps if you down-sample the input texture you can get away with using less samples.

Thanks guys for your comments! Yes you're right DarkAngel, 100 samples is quite fill-rate intensive. I did a few experiments with less samples, like 50 or 30, and it creates some artifacts, that are even more noticeable when the lightshafts are moving. But as you mentionned, using smaller buffers helps because it blurs most the artifacts. I am still working on it to get the best quality/performance ratio, but I will post my final code if some people are interested. As of now the performances are 310 fps with 100 sample, 500 fps with 50 samples, and 665 fps with 30 samples all in 1024x768 with my GTX 470.

Thanks DarkAngel for your very good advices!

Im interested

I tried to make similar shader, but mine only uses 20 samples. It does two passes, first one works similar to yours, except only using 10 samples, writes result to a half resolution buffer (not necessary, but speeds up things a bit and looks almost identical), and second pass is just a simple 10-sample radial blur. In the end it looks more or less same as one 100-sample pass.
Video

Great work, it's nice to see how your project progresses! I especially like your lit particles...