Cat Coasters 03
by pmoews, published
The four plane groups are: cmm. p4, p4m, and p4g. Three of these groups contain four fold rotation axes. p4 has only rotational symmetry, p4m and p4g contain combinations of reflection and glide lines. The four sets of files for dual extrusion are:
cat_coasters_cmm.stl and cat_decorations_cmm.stl
cat_coasters_p4.stl and cat_decorations_p4.stl
cat_coasters_p4m.stl and cat_decorations_p4m.stl
cat_coasters_p4g.stl and cat_decorations_p4g.stl
Cat_coasters_03 scad created the stl files and the images are in coasters_dxf_03.zip
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I'm looking forward to the 3D point / space groups ;-)
You could also show the Laue groups on the surface of a sphere... oh, you've started already ;-) [If you have a spare moment, have a look at chapter 5 of www.amazon.com/dp/0387881352]
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The coasters can be used as teaching aids. Pdf files that show some of the symmetry elements are included in coasters_dxf_03.zip. Reflection lines are shown in red and glide lines in blue.
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