Lately I was experimenting with contact shadow. But I don´t really understand what the contact shadow length value in a lightsource stands for.
Sure, if I set it to something like 0.1 it works well but… why? I read in the documentation, that the value resembles how far a trace from a pixel to the light source is shooting. But wouldn´t that mean, that 1 (which in practice does not work well) is always good, since it can travel over the whole screen?
There are a finite number of samples, so the larger the length, the more spaced out the samples get, causing discontinuities. I wish it gave control over the sample count, but I’m not sure it would be practical to sample every single pixel even of we could adjust it.
That´s, what I didn´t quite understand thank you. So the longer the ray tracings are, the higher the probability, that the samples do not “find” the occluder, because they are simply not enough.
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