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Getting angles

Started by Greg K Dec 20, 2002 at 1:42 AM 4 replies 350+ views

Original Post

Dec 20, 2002 at 1:42 AM

I want two angles:

    |     
    |--\  
    |  |   This one (pitch)
    |__|_____
   /  /
  /--/ and this one (yaw)
 /
/
(Assume that a vector from the origin is going to (2,2,2))
[\code]

I was thinking of doing this:
pitch = atan2(z,x));
yaw = atan2(y,x));

Unfortunatly the pitch is wrong. The higher the yaw is, the more the pitch is wrong. I cannot find the relationship between them though. Any help?

Greg K

Author

Greg K

Dec 20, 2002 at 3:59 AM

pitch is the x rotation and yaw is the z rotation. Sorry.
-Greg

MattCarpenter

Dec 21, 2002 at 8:39 PM

Use DotProduct maybe?
It returns the cosine angle of 2 vectors (whatever that means)

// Dot Product (a x b)
inline float vecDotProduct(vec3_t a , vec3_t b)
{
return ( a.x * b.x + a.y * b.y + a.z * b.z );
}

I think a and b must be normalized

Greg K

Author

Greg K

Dec 22, 2002 at 9:06 PM

Thank you very much
-Greg

Basiror

140

Basiror

Dec 27, 2002 at 6:41 AM

quote:
Original post by MattCarpenter
Use DotProduct maybe?
It returns the cosine angle of 2 vectors (whatever that means)

// Dot Product (a x b)
inline float vecDotProduct(vec3_t a , vec3_t b)
{
return ( a.x * b.x + a.y * b.y + a.z * b.z );
}

I think a and b must be normalized

make sure a and b are normalized otherwise it won t work

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