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"...
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).
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
--
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Chareyre Bruno
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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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