More model conversions.

models/extra/BaseBeam.obj

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+# Blender 3.3.1
+# www.blender.org
+o Plane
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+f 9/9/3 10/10/3 12/12/3 11/11/3
+f 13/13/4 14/14/4 16/16/4 15/15/4

models/extra/BaseCube.obj

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+# Blender 3.3.1
+# www.blender.org
+o Cube
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models/extra/BaseSphere.obj

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+# Blender 3.3.1
+# www.blender.org
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