Rotating Velocity

SumWon · Post by **SumWon** » Wed May 06, 2009 4:33 am

Hi, I have a vector for an object's velocity, for example <1.85,-2.24,1.59> and I want to make a function to rotate it for me so I can supply the velocity and the rotation to rotate it by so I could rotate the direction the object is moving along any given axis. I'm not the greatest with math and cannot find a solution for this on my own, so any help would be appreciated, thanks =D.

ulao · Post by **ulao** » Wed May 06, 2009 12:25 pm

This depends on and if your using a phys engine, if so what one are you using? for example the irrnewt has getdirection functions. Also irrlicht has rotation to direction.

vitek · Post by **vitek** » Thu May 07, 2009 12:27 am

If I'm understanding what you're looking for, you just need to transform the velocity vector using the nodes transformation.

Code: Select all

// this is vector points 'forward' for any given object
core::vector3df forward(0.f, 0.f, 1.f);

// now forward is forward for node
node->getRelativeTransformation().rotateVect(forward);

// if you know node is a child of the root scene node, you could write
node->getAbsoluteTransformation().rotateVect(forward);

Travis