Hi,
Ive been implementing some interpolation code using quaternions the last
few days, and saw what I believe is incorrect behaviour when using the
quat::slerp method.
Looking at the code (modified from a gamasutra code sample), this is what I
believe is incorrect:
cosomega = from.asVec4() * to.asVec4();
if ( cosomega < 0.0 )
{
cosomega = -cosomega
quatTo = -to
}
Where from and to are the start quaternion value (t=0) and end value
(t=1) respectively.
If we try an interpolation from 0 degree to 91 degree (dotprod<0), the code
above changes the end quaternion orientation to be -91 degree instead of 91,
resulting in an invalid end orientation when t=1 (and the interpolation
generating intermediate angles in the wrong direction vs the expected
values).
Am I missing something ?
André
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