Hi Andre,
One things to be wary of the multiplication order, so if the article
uses one convertion while the OSG uses the opposite then expecting a
1:1 mapping can cause problems. I don't know if this is the root of
the problem you are seeing as I know too little about what you are
trying.
If you think there is a problem then I'd recommend creating a small
unit test which reproduces the problem and then send this along. For
instances modifying examples/osgunitests/osgunitests.cpp might be a
good place to add you test cases.
Cheers
Robert
On 12/14/06, André Garneau <[EMAIL PROTECTED]> wrote:
Hi,
I've 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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