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Get three points and calculate their plane equation (the plane equation: Ax+By+Cz+D=0 )
Note that (pln[0],pln[1],pln[2]) are the normal of the plane.
The direction of the normal (there are two possibilities) is determined according to
the direction of the points. The Normal will point towards the side in which the points will be in clockwise order
The return value is OK or VR_ERROR. note that we will get VR_ERROR if
the points are on the same line or are all equal.
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