Hi,
On 02/07/10 17:36, Tom Pearce wrote:
Hi,
q*f in OSG is shorthand for (qc * fq * q). It's the opposite of
what one might expect. There are some inconsistencies...
My approach is always to try it the way I think it should work, and
when it doesn't, start playing with the multiplication order -
eventually something works. It does mess with my head a bit when I
try and understand the math, but in the end as long as my code does
what I want, I'm don't worry much.
Just out of curiosity, does anyone know why quat*vec3 was implemented
the way it was? Everything I've read (outside of osg) about using
quats to rotate points (ie vectors) says q*fq*qc is the way to do
it.
I think it's merely a convenient overload of "*" that matches
matrix*vec... If you go look at the math in the Quat function, it does
qc*vq*q.
jp
Cheers, Tom
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