Sets a quaternion to the rotation by theta radians about v (or x, y, z), counter-clockwise looking down the axis. The axis must be unit length; it is not normalized here.
q: Quaternion;
set_from_axis_and_angle(*q, xyz(0, 0, 1), PI);
assert(abs(q.z - 1) < 0.0001 && abs(q.w) < 0.0001);
set_from_axis_and_angle(*q, 1, 0, 0, 0);
assert(q == Quaternion.{});set_from_axis_and_angle :: (q: *Quaternion, v: Vector3, theta: float)Sets *q to a rotation about an axis. The axis is not normalized, so pass a unit vector.
Parameters
- q: *Quaternion
- the quaternion to write.
- v: Vector3
- the rotation axis.
- theta: float
- the angle in radians.
set_from_axis_and_angle :: (
q: *Quaternion,
x: float,
y: float,
z: float,
theta: float
)Sets *q to a rotation about an axis. The axis is not normalized, so pass a unit vector.
Parameters
- q: *Quaternion
- the quaternion to write.
- x: float
- the x of the rotation axis.
- y: float
- the y of the rotation axis.
- z: float
- the z of the rotation axis.
- theta: float
- the angle in radians.