I'm trying to work out a navigation system for a 3d script that I'm writing.  I've successfully been able to use the mouse position to control radial rotation.  

Now, I only want to enable mouse rotation when the 'r' key is pressed.  I have been able to get this to work while the 'r' key is pressed down, but as soon as it is released, the object returns to its original position.  The strange thing is, when I press 'r' down again, the object goes back to the orientation it was in when 'r' was released.

Why aren't these transformations carried over?

Here is a simplified version with just a sphere and the keypress function.  

The code:


import processing.opengl.*;

boolean rotateMode;

void setup() {
 size(600, 600, OPENGL);
}

void keyPressed() {
 if (key == 'r') {
   rotateMode = true;
 }
}

void keyReleased() {
 if (key == 'r') {
   rotateMode = false;
 }
}



void draw() {
 background(0);
 fill(150);
 translate(width/2, height/2, -width);

 if (rotateMode) {

   rotateY(map(mouseX, 0, width, -PI, PI));
   rotateX(map(mouseY, 0, height, -PI, PI));
 }

 sphere(400);

}

Thanks! That totally worked.

I was getting thrown off because i *thought* that the rotated state was preserved and could be returned to when i pressed 'r'.  The real story is that i wasn't moving my mouse at that point, so the script was using the same mouseX and mouseY values to determine the rotation.  Silly me.