I've spent the last few days working on my own 3D transformer and overlay system for WoW - here is a quick demo of what it can do:
http://www.youtube.com/watch?v=-aoddoYURGIFor my own testing purposes, I created a control driver to drop anchors at arbitrary points in the game. My mod records the position, and for each anchor, renders it in 3D - taking into account camera distance, camera angles, player angles, player position, display resolution, and display aspect.
In the demo, I drop an anchor on each flower pot on the Dalaran landing pad, then run around at all angles, distances, and directions. You can see that each anchor is mapped from the (X,Y) system representing the game grid onto the (X,Y,Z) system representing the 3D world, then back onto the (X,Y) system representing your screen.
So far, I have two applications in mind (neither of which I thought of):
1) Encode this functionality into PCEQS, drawing a permanent line between you and who you have to bite.
2) On MouseOver in Grid, draw an arc between you and your MouseOverTarget - visually showing you where your heal will go.
Stay tuned for more demos!
-j