Sorry I try to explain better… problem appear during rotation. The Damper try to perform a smooth linear transition between two transformation matrix… while starting point and ending point are ok, in the between there is a transformation matrix that deform the cube

I got no deformation any more, but the final transformation are pretty chaotic
e.s. sometime x rotation works good, but each 3rd go in opposite direction for 270 degrees… combination of x,y and z are even worst :(

yes I did find the idea there.
Problem is that it works with progressive increment!
I’m working on something like Rubik Cube, so every rotation must be 0.25 (90 degrees)

have a look: if you perform a X rotation on your patch, then every Z and Y rotations are around same Axes!!! (Z I think)
can someone explain me why!?!?!?!?! I’m gonna got crazy