Material: Hatches are displayed in FEM_MaterialSolid

[FEA-eng]

Is there an existing issue for this?

• I have searched the existing issues

Problem description

It was already discussed on the forum as a current limitation but it's good to document this here as well. After the recent material changes, FEM_MaterialSolid displays also hatches which of course can't be used as FEM materials and don't have any physical properties. In the future, there should be a way to exclude them (possibly by default).

Forum discussion: https://forum.freecad.org/viewtopic.php?t=78242&start=150#p744369

Full version info

OS: Windows 10 build 19045
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37213 (Git)
Build type: Release
Branch: main

Subproject(s) affected?

Core

Anything else?

No response

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