Peeling Quartunions makes Me weep

Hi All,

I have been attempting to follow this thread because it appears similar in nature to what I am trying to achieve. However no copious partaking of (insert your favourite substance here) has helped me to understand the question, let alone the answers.

I need an object to rez another, a given distance to the "right" and "forward" of whichever way that object is rotated around the world Z axis, as well as a given distance "up" from that object. I'm guessing that because the rezzor object (the one which contains the llRezObject function) is itself at a non zero rotation that I first need to convert to world coordinates in order to specify the x, y, and z locations succesfully.

I've tried to use something along the following lines:

llRezObject("arrow", llGetPos()+<2,1,3>* (ZERO_ROTATION/llGetRot()) , <0,0,0>,<0,0,0,0>, 1);

but this does not achieve what I want. (when I rotate the rezzor object around what in world terms would be the Z axis the rezzed item does not appear anywhere near where I would expect it to). I've spent a couple of days trying to adapt the various examples in the wikki and posts I have seen in this forum to no avail. I'd appreciate any assistance you can provide

Thanks,
Dominus

try

rotation my_rot = llGetRot();
llRezObject("arrow", llGetPos()+(<2,1,3>*my_rot), <0,0,0>, my_rot, 1);

You compound rotations with the multiplication operator, and remove/invert them with the division operator. I don't know what's so hard about that, really. Forget about that thread, there's no need to manipulate quaternion components directly, and no need to use ZERO_ROTATION anywhere.
Think of a rotation as a rotation, and know that it will rotate a vector if you multiply them.

Yes we are just being nerdy in the other thread.

I think I just got called stupid.

And that the order of operations sometimes matters.

"Quaternions are the things that scare all manner of mice and men. They are the things that go bump in the night. They are the reason your math teacher gave you an F. They are all that you have come to fear, and more. Quaternions are your worst nightmare." -- Confuted

I won't have a chance to test this fully until I get back from working in a couple of days, but the limited testing I was able to do before I left seems to indicate this function should work nicely

I really appreciate the assistance

Dominus