get_flat_tri_mask(self, min_circle_ratio=0.01, rescale=True)
Returns a mask new_mask which allows to clean the encapsulated triangulation from its border-located flat triangles (according to their circle_ratios
). This mask is meant to be subsequently applied to the triangulation using .Triangulation.set_mask
. new_mask is an extension of the initial triangulation mask in the sense that an initially masked triangle will remain masked.
The new_mask array is computed recursively; at each step flat triangles are removed only if they share a side with the current mesh border. Thus no new holes in the triangulated domain will be created.
The rationale behind this function is that a Delaunay triangulation - of an unstructured set of points - sometimes contains almost flat triangles at its border, leading to artifacts in plots (especially for high-resolution contouring). Masked with computed new_mask, the encapsulated triangulation would contain no more unmasked border triangles with a circle ratio below min_circle_ratio, thus improving the mesh quality for subsequent plots or interpolation.
Border triangles with incircle/circumcircle radii ratio r/R will be removed if r/R < min_circle_ratio.
If True, first, internally rescale (based on :None:None:`scale_factors`) so that the (unmasked) triangles fit exactly inside a unit square mesh. This rescaling accounts for the difference of scale which might exist between the 2 axis.
Mask to apply to encapsulated triangulation. All the initially masked triangles remain masked in the new_mask.
Eliminate excessively flat border triangles from the triangulation.
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