Shading of viscircles weird behavior
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ludolfusexe
il 15 Lug 2024 alle 12:18
Commentato: ludolfusexe
il 16 Lug 2024 alle 5:35
When I export a figure via
exportgraphics(axis,filename);
multiple times, I get the strange behavior that after some exports circles drawn via
viscircles(axis,[x, y],r,'EnhanceVisibility',true);
are shaded white (just the white circle remains which is shaded to improve visibility).
This worked fine for weeks, but now I added the yellow surface-plot below and now this behavior appears.
Can someone explain why this happens and what to do that the export works (while 'EnhanceVisibility', true remains)?
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Milan Bansal
il 15 Lug 2024 alle 14:16
Hi @ludolfusexe
Can you please provide the code to reproduce the issue.
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Walter Roberson
il 15 Lug 2024 alle 20:58
viscircles() uses 2D coordinates, with an implicit ZData of 0.
When you draw a surface, the surface has 3D coordinates.
When 2D data and 3D data are mixed, there are several possible outcomes:
- the object that is drawn later "wins" at Z coordinate 0
- the 3D object "wins" at Z coordinate 0
- the 2D object "wins" at Z coordinate 0
- the 2D object "wins" everywhere, drawn "on top" of the 3D object no matter what the 3D coordinates are
- the 3D object "wins" everwhere, hiding the 2D object everywhere
In practice, this is controlled by the axes SortMethod property
the default of which is "depth". But "depth" doesn't talk explicitly about what happens for 2D objects (are they treated as 3D with Z = 0?) versus 3D objects, and does not talk explicitly about what happens when there is a surface and a line at the same depth. In practice 2D objects are not always treated the same way as Z = 0...
To be safer, you should switch your viscircles() into plot3() calls with Z = 0.
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