http://bugs.winehq.org/show_bug.cgi?id=18501
--- Comment #14 from Vitaliy Margolen vitaliy@kievinfo.com 2009-11-09 21:38:39 --- Path is almost correct - it needs 2 temporary vectors to prevent modification of passed vectors a & b. Also test proving that D3DRMQuaternionSlerp does not modify a & b will be nice.