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The problem is unshear also applies stretches, and it leads to very complex corner cases (reason for the "cos" thing). Yes, I checked facets code too. No big deal. It is in fact simple to strectch Aabbs.I don't really see any difference, unTransform only additionally removes strech (which unShear doesn't). That means you have to scale the Aabb (don't forget Facets).
Well, I can send you a working script but you also need my code (with spaces, very few comments... but no duplicate). I will not commit it because you would revert! ;)You have untransform sphere shape itself anyway, which gives ellipsoid, in which case the Aabb is enlarged in the shear direction. I am very sure that what you propose doesn't work, but you can try to convince me :-)
Seriously, I see it running in front of me. You should trust me. :)The last problem is it is still not infinite shear, it stops at the same point (ux/height=300% or so) than with unshear/size.
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