On 21-9-2014 17:39, LanuHum wrote:
> Therefore it is difficult to understand even an overall picture:
> Why HF how HF influences mesh is used is a secret.

I think those are basic concepts, also in Blender?

The /normal/ of a point on a surface is the vector /perpendicular/ to 
the surface (see also the Docs: paragraph 2.3.5.2). Using trace() you 
can get the normal at a certain point. Knowing the normal, you can 
calculate the angle it makes with a horizontal plane, or the angle it 
makes with another vector around an axis.

Thomas

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