Quaternions...

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Guy (silicon-worlds++at++calva.net)
Thu, 08 Jan 1998 11:45:02 +0100

Hi,

This must be a trivial question, but here it is.

I've just decided to give a try to quaternions to interpolate between
rotations. In my tests, I've noticed that I cannot get pfQuat:slerp to
give me a correct answer... ( BTW, I'm using Performer 2.0.2 on IRIX
5.3).

When I do this:

pfQuat zero,one,result;
zero.makeRot( 10, axis0[PF_X], axis0[PF_Y], axis0[PF_Z] );
one.makeRot( 50, axis1[PF_X], axis1[PF_Y], axis1[PF_Z] );

result.slerp( 0.5, zero, one);

The pfQuat result gives me a rotation of 0.5 around axis1. pfQuat::slerp
seems to set the rotation angle and nothing else.

Is it a bug (unlikely) or is there something I don't understand
(likely)?

Thanks for the answer,

Guy Premont

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