teepee changed the topic of #openscad to: OpenSCAD - The Programmers Solid 3D CAD Modeller | This channel is logged! | Website: http://www.openscad.org/ | FAQ: https://goo.gl/pcT7y3 | Request features / report bugs: https://goo.gl/lj0JRI | Tutorial: https://bit.ly/37P6z0B | Books: https://bit.ly/3xlLcQq | FOSDEM 2020: https://bit.ly/35xZGy6 | Logs: https://bit.ly/32MfbH5
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<J234564> +1 for InPhase ..  it is not the 80s anymore, where everything need to look blocky
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<gbruno> [github] pixelcmtd opened issue #4624 (CGAL error in CGAL_Nef_polyhedron3(): assertion violation) https://github.com/openscad/openscad/issues/4624
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<Lagopus> how is a skew value in a multmatrix mathematically handled? I cannot seem to comprehend despite the wiki.
<J234564> i would assume it is a multiplication of the vector/point  with the other axis value. So e.g   [0,0,5] ↦ skew in x [0+5,0,5]
<Lagopus> hmm, ok I'll try out some new numbers
<Lagopus> ah, ok good
<Lagopus> it's a slope, more or less
<Lagopus> 1/slope
<J234564> Lagopus https://bpa.st/3TGBO
<J234564> atan(1) = 45°
<Lagopus> yes, your hint was perfect. Essentially I a cylinder skewed to match up with an unskewed cylinder at the top of both objects
<J234564> if you need a slope 60°   just enter tan(60)
<Lagopus> I'm using a plain run/rise which is good
<Lagopus> (y row): [0,1,-(psups)/(psuph),psups],
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