Can someone please give me a function that rotates quaternion so it faces some direction in space. So far I got this but it doesn''t work very well. It starts "shaking" very badly when it should stand still.. kind like pulse effect.. alternating small + and - rotation... void UCamera::SetDirection( const UVector &dir ) { if ( dir.IsZero() == true ) return; UVector adjustVec( dir.x, dir.y, dir.z ); adjustVec.Normalize(); float rotAngle = arccos( (-frontVector) % adjustVec ); // dot product UVector rotAxis = frontVector * adjustVec; // cross product if ( rotAxis.IsZero() == true ) { rotAxis = upVector; } UQuaternion rotQuat; rotQuat.SetAxisAngle( rotAxis.x, rotAxis.y, rotAxis.z, rotAngle ); rotation.PostMultiply( rotQuat ); RebuildVectors(); } There are more worlds than the one that you hold in your hand...

sorry I can''t help you with your code, but there''s a new Game Programming Tutorial on NeHe''s site that demonstrates quaternion rotations.


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wojtos: I know alot about quaternion rotations but this tutorial is not exacley the best. I just need this function or someone to tell me what is wrong with mine.

There are more worlds than the one that you hold in your hand...