llRotLookAt and llLookAt Issue :/

Hi i have been trying to script missile turret to use both mouse look ROT and lookat pos i have a question about the two

Why does llRotLookAt have a different forward axis to llLookAt they are about PI/4 difference

only when i try to add * <0,0,PI/4,0> there is no change in the rotation at all

Has any one come across this problem before and has found the correct rotation formula?

this is what i currently have

rotation campos;
default
{
state_entry()
{
llRequestPermissions( llGetOwner(), PERMISSION_TRACK_CAMERA );
}
run_time_permissions(integer perm)
{
if (perm & PERMISSION_TRIGGER_ANIMATION)
{


}
}
timer()
{
campos = llGetCameraRot(); // * <0,0,PI/4,0> <--- maybe im missing some thing
llRotLookAt( campos , 2.0, 1.0 );

}




touch_start(integer total_number)
{
llSetTimerEvent(0.1);
}
}

llLookAt has the Z-axis as forward, llRotLooAt has the X-axis.
It won't help to ask why, that is the way it is
To overcome that and to change to what you want as forward, you add a constant rotation the way you describe.
So you provided the solution.

Besides: using an angle in a quaternion is WRONG!
http://www.lslwiki.net/lslwiki/wakka.php?wakka=quaternions

llLookAt takes a vector, and uses a default of "up" or < 0.0,0.0,1.0 > to rotate "from".

llRotLookAt takes a rotation, which works like all other rotation functions. The rotation engine treats all rotations with X-axis as forward.

The difference between the two isn't PI/4.0, it is PI/2.0 (90 degrees), but that is only true based on axis separation.

If the root prim of what you are rotating isn't "pointing" in the positive X-axis direction at ZERO_ROTATION, then you have to calculate the difference and include it as a constant rotation.

ie:

rotation rot_diff = llEuler2Rot(<0.0,PI/4.0,0.0>; // or whatever the difference in rotation is
llRotLookAt( llGetCameraRot() / rot_diff, 2.0, 1.0);