hello,
i'm working on a project with a large amount of words displayed inside a 3d scene. i'm trying to make a simple selection of a word when the user clicks on it. it sounds easy but when i rotate or translate my scene, the mouse position (mouseX and mouseY) doesn't match with the word position (x y, z), wich is normal, but i just don't know how to do it.
actually, i'd need a method to convert the words positions in 2d and inside the display (like the mouse position)...

the basic mousePressed function:

void mousePressed() {
 if (mouseButton == LEFT){
   float distance=10;
   for (int i = 0; i < wordNum; i++) {
     Word w = words[i];
     float d = dist(mouseX, mouseY, w.x, w.y);
     if (d < distance) {
       selection = w;
       distance = d;
     }
   }
   if (selection != null) print(w.label);
 }
}

it works if i don't translate anything but when i do:

translate(width/2,height/2,zoom);

before displaying my words inside the draw loop, it doesn't work anymore...

so i tried this:

void mousePressed() {
 if (mouseButton == LEFT){
   float distance=10;
   float newx=map(mouseX,0,width,-width/2,width/2);
   float newy=map(mouseY,0,height,-height/2,height/2);
   for (int i = 0; i < wordNum; i++) {
     Word w = words[i];
     float d = dist(newx, newy, w.x, w.y);
     if (d < distance) {
       selection = w;
       distance = d;
     }
   }
   if (selection != null) print(w.label);
 }
}

if there is no z translation, it works, but i need some z translations and some rotations...
help is welcome!!!!!

hello! thanks a lot, it works!!
so with modelX/Y/Z, i record my words coordinates based on the current set of transformations and i use screenX and screenY to map those coordinates inside the mousePressed function.