llRotLookAt(rotation target, float strength, float damping);

Rotates the object that contains the script (aligns forward/x-axis to camera) to target over damping seconds.

This function works for both physical and non-physical objects. For non-physical objects, good strength values are around half the mass of the object and good damping values are less than 1/10th of the strength. For physical objects, this function behaves more like llMoveToTarget, where increasing the strength or tau seems to slow the rotation. Good values for physical objects range between .2 and 1 for both parameters. Asymmetrical shapes require smaller damping.


Calling llStopLookAt stops the effects of this function.
Failure to stop may render a prim unlinkable until llStopLookAt is called (even if the script is removed).

Note: within the LSL editor, the tooltip for llRotLookAt reads "llRotLookAt(rotation target, F32 strength, F32 damping)". F32 refers to a 32-bit float. In LSL, all floats are 32-bit.

Compare with llLookAt.

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Functions | Dynamics | Rotation

rotation zero_xy(rotation a)
{
    a.s = llSqrt(a.x * a.x + a.y * a.y + a.s * a.s);//if you knew it were a normal rotation you could replace this with a.s = llSqrt(1 - a.z * a.z);
    a.x = a.y = 0.0;
    return a;
}

// axisKeep is a "boolean vector", it should have 1 for the
// axies you want to keep, 0 for the axes you want to drop.
// to keep only the rotation along the y-axis, you'd pass <0, 1, 0>
rotation zeroAxis(rotation rot, vector axisKeep) {
    vector euler = llRot2Euler(rot);
    return llEuler2Rot(<euler.x * axisKeep.x, euler.y * axisKeep.y, euler.z * axisKeep.z>);
}