- SkyLight
- Spherical Harmonics
- Lightmaps
As first example, I just made a Phong+Lambert*DiffuseConvolution:
At first, I had a problem, because UDK rotates cubemaps -90 in X axis. So I had to do some matrix rotation in the pixel shader to find what was wrong there.
Rotation in X=90 was my first attempt, so it was fast. Once I known that, I had to find a software to do this. HDR Shop was the solution.
The next step was made in CubeMapGen. I imported the hdr file created in HDR Shop and applied the needed filters. Then, export CubeMap as images and we are done, ready to import to UDK.
I used public Light Probes, just for now, for testing. But the idea is to export your UDK cubes and create the convolved offline. There is a plugin called Diffuse_sh designed for that. It doesnt work for me. HDR Shop too, but my results weren't good. A sloppy solution would be a Blur in CubeMapGen... but it cant be correct.
I applied the trick to my translucent shader. The difference is barely noticeable due to the light algorithm I made there, but in a Lambertian one, is very notable.
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