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PlanarCheck helps you verify
that all quads of a part file are planar enough to fulfill LDraw.org Parts
Tracker requirements. While a triangle is always flat, a quad may be warped.
This can yield weird rendering results, as exemplified by the center square in
the image above (though the effect is generally much less apparent, the center
square is VERY distorted for illustration purpose...).
Coplanarity verification was previously done using “Dist Coplanarity Check” and
“Det Coplanarity Check” included in L3P or LDDP. Unfortunately these tools
results were not simple to interpret, since Dist values are proportional to the
size of the quad, and Det values are proportional to size^3. PlanarCheck tries
to overcome this issue by calculating the angle between the triangles composing
the quad.
The coplanarity error threshold default is 3°, and a warning is issued for quads
whose non-coplanarity exceeds 1°.
Program, source, documentation, examples are available
here
Philo
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