At 45 degrees angle of incidence, the perceived error of the direcitonal light is 34%!!! That's huge. This is what I noticed right away when I first started using Poser. However, I did not know what the problem was.

I did many experiments, and learned to add more lights just like the rest of you, but things NEVER looked realistc. They simply looked less bad. That's because even after adding a lot more light, the error is still 14% at 45 degrees. A mistake in shading of 14% is very noticeable. This is the sort of thing people put up with all the time, and it is precisely why my shaders are so popular. I work hard not just to get the realism error under 14%, but usually I get it under 3%.

This is also why some people, even though they use my shaders, get not so good results. They over light the scene, and don't know why it doesn't look real. This is why. You must use GC in the shaders, or the render, or in postwork. Obviously I prefer in the renderer, but I'll do it in the shader if I have to. I never do postwork to fix shader and lighting problems.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)