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No definitive answer on my side, but the "theoretical" answer could be : simple shear can be seen as grains passing through a fixed rectangular window (each time one grain goes out via the right hand side, it comes back from the left).Whatever coordinates you use, spheres will transform to ellipsoids, stretching the Aabb. As the transform stretches Aabb's too much (the angle is too sharp), Aabb's sizes will approach the limit. This is a theoretical question that you can't solve by saying "it works"...
If you see it that way, you easily realize that there is no physical size restriction as in compression/tension/pure-shear.
The "hint" for elipsoïds is that you have to stretch them in the correct coordinate systems, so that they dont move out of the period. For this part, I'm still "practically" lost with too many rotation matrices...
I'll send you the diff, it needs adjustments. Bruno -- _______________ Chareyre Bruno Maître de Conférences Grenoble INP Laboratoire 3SR - bureau E145 BP 53 - 38041, Grenoble cedex 9 - France Tél : 33 4 56 52 86 21 Fax : 33 4 76 82 70 43 ________________
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