fmeobjects.FMETriangleFan.isPlanar

FMETriangleFan.isPlanar(tolerance)

Returns True if this is planar within the given tolerance, and False otherwise.

The planarity condition is computed by the following algorithm. The normal vector <A, B, C> is determined by the vertices of this surface using Newell’s method. For the first point (x’, y’, z’) of this surface, we compute D’ = Ax’ + By’ + Cz’. Then, this surface is planar if and only if every subsequent point (x, y, z) of this surface gives a D = Ax + By + Cz, that is within the tolerance amount of D’. That is, | D - D’ | <= tolerance.

If the specified tolerance is negative, then this method always returns True.

Parameters:

tolerance (float) – The tolerance to check against.

Return type:

bool

Returns:

Whether the surface is planar within the tolerance supplied.