When a DWG file is imported into FreeCAD it gets imported as a Part
object with a compound shape. One would imagine, that such an object
should be rendered like a symbol inside a TechDraw View. But when the
imported shape is inside a SectionPlane that also contains solids, the
shape is not included in the SVG.
The problem is, that getCutShapes only uses solid shapes, when a volume
was cut before. But the imported DWG is a flat 2D object and has no solids
inside.
To fix it, the getSVG method will check if an object looks like a draft
object, meaning:
- It has a shape
- It has no solids
- It has no volume
When it finds such a shape, it will treat it like a draft object. So
it is displayed like a symbol in the resulting SVG.
https://forum.freecadweb.org/viewtopic.php?f=3&t=34079
f1e86b3e11