Heading / Pitch

Hi All,

What is the fastest way to calculate the Heading / Pitch from an incoming vector/normal?

i.e. I have an incoming vector (a Ray) heading to a point. When it reaches the point, I want to (for example) be able to turn the object at the point to point down the direction of the incoming ray (roll is not important in this case).

Now I know you can something along those lines with GluLookAt(), but I'm after making a simple GetHeadingandPitch(NX:Float,NY:Float,NZ:Float, Heading:Float Var, Pitch:Float Var) function.

(I would prefer to do it without resorting to using a Matrix)

Any ideas?

Tried Marks geom code?

http://blitzbasic.com/Community/posts.php?topic=42657

Check the pitch & yaw methods of his vector class. I guess you'd want to reverse the incoming vector first though.

Thanks Tom,

From that so far I would expect:

Heading = -atan2(-x,-z)
Pitch = -atan2(-y,sqr( -x*-x+-z*-z ) )