public static quat FpsQuat(quat rotation, float dx, float dy)
{
quat rx = new quat(AxisAngle.RightHandAround(vec3.Up, angle.FromDegrees(-dx)));
quat ry = new quat(AxisAngle.RightHandAround(rotation.Right, angle.FromDegrees(-dy)));
quat final = rx * ry;
return(final);
}
public quat rotation(vec2 from, vec2 to)
{
vec3 f = transform(from);
vec3 t = transform(to);
vec3 axis = vec3.cross(f, t).Normalized;
angle angle = vec3.AngleBetween(f, t);
return(new quat(AxisAngle.RightHandAround(axis, angle)));
}