The grid-2 in step-1, produced without color by using:
GridOutFlags::Svg svg_flags;
svg_flags.coloring = svg_flags.Coloring::none;
svg_flags.label_level_number = false;
svg_flags.label_cell_index = false;
grid_out.set_flags(svg_flags);
shows some spurious connections at every refinement. The problem goes away, or
is hidden, when format is eps. PFA grid-2.svg and grid-2.eps.
The same problem is more clearly visible in step-2 when mesh is printed with
gnuplot using the code given in "Possibilities for extension". PFA grid-2.pdf.
Ankit:
This is basically the same issue as here:
https://github.com/dealii/dealii/wiki/Frequently-Asked-Questions#in-my-graphical-output-the-solution-appears-discontinuous-at-hanging-nodes
The edges of cells are shown as straight lines, even though internally they
are curved. The geometry really does not have holes, but it is visualized as
if it had.
Best
W.
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www: http://www.math.colostate.edu/~bangerth/
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