vec_to_angle

vec_to_angle (ANGLE* ang, VECTOR* dir);

Computes the pan and tilt angles of a direction vector, and places them into the pan and tilt parameters of an Euler angle. Very useful for trading an angle for a direction, thus computing the angles to a target.

Parameters:

ang	Euler angle to be calculated.
dir	direction vector.

Returns:

Length of the vector

Modifies:

ang

Speed:

Fast

Algorithm:

ANGLE.pan = atan(VECTOR.y/VECTOR.x);
ANGLE.tilt = asin(VECTOR.z/length(VECTOR));

Example:

function turn_towards_target()
{
  // get the direction from the entity MY to the entity YOU
  vec_set(temp,your.x); 
  vec_sub(temp,my.x);
  vec_to_angle(my.pan,temp); // now MY looks at YOU
}

See also:

pan, tilt, roll, ang_add, vec_rotate, vec_for_angle

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