Hey all,

I'm not exactly sure how to phrase this (which is probably why I haven't been able to find the answer elsewhere in the discourse), but I have a complex series of nested matrix transformations, each within several levels of push and pop matrixes. I'm able to use modelx/y/z to get the absolute location of the innermost transformation so I can aim a camera at it outside of the nested transformations.

However, I haven't hit on a way to position my camera to look at that point from the proper location. In other words, if I'm placing text on screen in the middle of these complex transformations, I know *where* to look, but not *from where* to look so I'm facing the front text instead of the back of it.

I hope that makes sense. Is there a way to figure that out?

Just for future reference, I figured out an obvious solution which is to set the camera eye location at the same time as the target (duh)! However, there seems to be a bug in 1.0 that makes everything freak out when you try to aim a camera and use modelx/y/z. At any rate, here's the code as I believe it *should* work and I've filed bug 1074.

// Simplified example:

import processing.opengl.*;
import damkjer.ocd.*;

PFont myFont;
Camera viewCamera;

void setup() {
 size(320, 240, OPENGL);

 myFont = createFont("Arial", 32);
 textFont(myFont);
 viewCamera = new Camera(this);
}

void draw() {
 float targetX, targetY, targetZ;
   float eyeX, eyeY, eyeZ;
 background(0);

 pushMatrix();
 translate(50,25);
 rotateY(radians(45));
 
 pushMatrix();
 translate(100,200,300);
 rotateY(radians(90));
 
 pushMatrix();
 translate(20,30,40);
 rotateY(radians(45));
 text("LOOK AT ME!", 0, 0);
 targetX = modelX(0,0,0);
 targetY = modelY(0,0,0);
 targetZ = modelZ(0,0,0);
 eyeX = modelX(0,0,500);
 eyeY = modelY(0,0,500);
 eyeZ = modelZ(0,0,500);
 popMatrix();
 
 popMatrix();
   
 popMatrix();
 
 // I know where to look thanks to modelx/y/z
 viewCamera.aim(targetX, targetY, targetZ);
 // And this is where I should look from, but processing hates it right now.
 viewCamera.jump(eyeX, eyeY, eyeZ);
 viewCamera.feed();
}