Figuring Rotation Between Two Points?

Say I've got point A (we'll say <3,3,3> ) and point B (<2,3, 1>. I want to know what rotation I need to look from point A to point B, assuming zero rotation to begin with. Anyone know how to do this or am I misreading one of the rotation functions on the wiki?

Okay, if you're at A, you want to point yourself towards B - in other words, pointing in the vector (B-A). Presumably you want to have your forward vector pointing in that direction.

Therefore you work out the rotation between your forward vector and (B-A). To find out what that is, I think you want:

llRotBetween(llRot2Fwd(llGetRot()), llVecNorm(vecB - vecA))

where vecB and vecA are the positions of B and A respectively.

Disclaimer: I am rubbish at rotations.

Probably this would be better:

llRotBetween(<0,0,1>, llVecNorm(vecB - vecA))

(if you want to llSetRot(that_thing) and have the top (say) point at B).

Yeah, if you want to use llSetRot you'll want the absolute rotation, i.e. from the axis you want to point at zero rotation, rather than the one relative to your current facing.

Also consider llLookAt(), which will rotate your object to look at a point. Works on physical and nonphysical objects.

I wanted to know because I'm making a camera that simulates the Resident Evil style. It fixes the camera's location at a nearby prim that's above your waist height. That's all well and good, and it does that, but with thick objects that have nearby prims your view can be obstructed somewhat. So I was thinking of shifting the camera's position 2m out from the center of the prim towards the avatar. I have an equation to do such an adjustment, but I need to know the rotation necessary to point from the prim's location to the player's position.