[hist3d] opt out extremely small line segments, use eps
for faces flipping
#20143
+14
−5
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In two places of lego/surface plots output result may differs because of float arithmetic deviations on different platforms.
SURF1
draw option flip order of painting of two triangles (faces) only if calculated Z value differs by epsilon (1e-12). This ensures always same order on different platforms and exclude float arithmetic errors.Both changes allows to produce similar SVG/PS/PDF output for majority of 3d plots produced by ROOT graphics.