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"Difference" operation destroys Bezier curvature
Posted Mar 29, 2011, 7:32 p.m. EDT Geometry, Parameters, Variables, & Functions 2 Replies
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Good Evening,
In 2D modeling, I find that when I take the difference between two solids then some lines that were originally drawn as Bezier curves become straight -- they lose their curvature and are rendered as simple straight lines. This isn't just a rendering issue, since all subsequent meshing and solutions obey the new straight boundaries. How can I preserve my curvature?? Note that my resulting solid object does have a wide distribution of feature sizes, with lines varying in length from 200 to 0.02 m. Also note that this problem doesn't happen every time, although I haven't yet been able to figure out exactly what conditions cause it.
Many Thanks,
Rafael
In 2D modeling, I find that when I take the difference between two solids then some lines that were originally drawn as Bezier curves become straight -- they lose their curvature and are rendered as simple straight lines. This isn't just a rendering issue, since all subsequent meshing and solutions obey the new straight boundaries. How can I preserve my curvature?? Note that my resulting solid object does have a wide distribution of feature sizes, with lines varying in length from 200 to 0.02 m. Also note that this problem doesn't happen every time, although I haven't yet been able to figure out exactly what conditions cause it.
Many Thanks,
Rafael
2 Replies Last Post Mar 30, 2011, 7:31 a.m. EDT
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Posted:
1 decade ago
Hi
have you checked the relative tolerance value, sometimes it needs to be adapted (might not be the issue) ?
--
Good luck
Ivar
have you checked the relative tolerance value, sometimes it needs to be adapted (might not be the issue) ?
--
Good luck
Ivar
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Posted:
1 decade ago
Thanks Ivar,
The relative tolerance was not the problem -- adjusting it didn't change the resulting solid. But I found that by restricting the maximum mesh size on the two straightened lines their curvature is "recovered" after meshing. Strange that they would be rendered straight until a fine mesh is created, rather like the model rendering is anticipating the expected mesh size. But problem solved.
Best,
Rafael
The relative tolerance was not the problem -- adjusting it didn't change the resulting solid. But I found that by restricting the maximum mesh size on the two straightened lines their curvature is "recovered" after meshing. Strange that they would be rendered straight until a fine mesh is created, rather like the model rendering is anticipating the expected mesh size. But problem solved.
Best,
Rafael