I make a torus, using normal as 1 0 0, which makes 90 degree with both y-axis and z-axis. Another torus with normal as 1 1 0, but it makes 45 degree with both x-axis and y-axis. I think it uses tan inverse i.e. tan-1(x/y). I convert this into POV-ray by using 'tan inverse' . But I found it difficult when z comes. Is BRL-CAD uses tan for calculating Normal? Or any concept which can also help in POV-ray. As it also helps me in azimuth and elevation checking.
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