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Le 16/08/2015 18:21, Mike Horvath a écrit :
> How do I calculate the slope of a 3D triangle with respect to the
> ground plane? And I need a non-POVray solution. Thanks.
> 
> Mike

basic 3x3 matrix of delta, in height field.
You get 8 products ( assume a 3x3 grid, numbered clockwise around the
center cell, of vectors from center cell to border cell: 1-c-2, 2-c-3,
...up to 8-c-1 ).

The projection on the plane of each products is 45°, so the sum of the
8 values gives you a criteria to detect a relative null curvature.

(there is the true flat situation, and the monkey saddle, but for the
central point, all of them are of flat at center).


Now, if you have a true triangle, it's another matter, just compute
the normal and normalize it, then project on the vertical axis and
check the length of the projection.
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