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It's not a bug, really. Whether or not a bevel will generate 'correct' geometry depends on the typeface, whether the bevel isn't overlapping other parts of the geometry, and the typeface vectors.
The letter E causes problems due to how the vectors are interpreted. This might actually be an issue caused by the font's vector outlines. If you look closely you can tell that the letters A and V also have a problem where the inner angle begins to overlap too much (check the crotch of the V, for example). This is a limitation of the bevel routine in Dimension. And there are shading issues as well due to bad normals where the bevel meets in corners. In short: problematic.
This is sort-of expected behaviour when working with bevels in 3d applications, however. Bevel routines are very difficult to get exactly right, and it depends on the context and also on the input quality, i.e. the font vectors in this case.
Solutions are:
- try a different version of the same typeface. Not all typefaces from all type foundries share the same quality.
- convert the typeface to outlines in Illustrator, and clean up (read: fix) the vectors to their simplest solution. Import into Dimension (or another 3D app such as Blender) and try once again).
- switch to another typeface
- switch to another 3D application, and bevel the typeface (or type outlines) in that application, then export the result for import into Dimension.
- manually fix the geometry (in a 3D application such as Blender) if nothing else works.
This is what the Amaranth font on my system looks like when beveled in Blender:
No issues here. But notice how the bevel routine in Blender does reduce the eyes and crotch space in various letters. But something has gotta give to allow the bevel to do its work.
So yeah: bevels in (polygon based) 3D can be tricky to get right. CAD apps fare much better here, but the result has to be converted to polygons once more for import into an app like Dimension. Which can again cause a myriad of issues!
In short: there is no magic solution here. It depends on the context, the app(s), the bevel algorithm, the font quality itself, and so on.
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