getForwardVector?

[yvanvds]

Just a quick beginners question i could not find anything about on the Forums...

I am using FMOD for sound in my program, and for the listener position it uses 4 vectors: position, velocity, forward and up. Mapping position to a camerascenenode is not difficult, and i have not looked at velocity yet, but what about forward? There is a 'getUpVector' function, but nothing for the forward vector. Or is there?

What values correlate to this?

[yvanvds]

I found this code in the forums:

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irr::core::vector3df vector = irr::core::vector3df(0,0,1);
irr::core::matrix4 m;
m.setRotationDegrees(camera->getRotation());
m.transformVect(vector);

the vector should be the 'Forward' vector I am looking for. However it doesn't seem to be exactly right, because sound is now constantly swapping between left and right very fast.

any ideas?

[CuteAlien]

You could try (no guarantee):

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irr::core::vector3f forward = camera->getTarget() - camera->getPosition();

// maybe also needed (not sure what fmod expects):
forward.normalize();

[yvanvds]

Thanks! That was exactly what I needed. I didn't imagine it could be that simple. And FMOD vectors must be normalized indeed. It seems I'd better take some time to read up on matrixes and vectors when i find some time