Hi,

I'm having a bit of problem with trying to keep track of points in a model in a situation where there are multiple translation involved.  Here is a hypothetical project code:

Code:

Arm arm1, arm2;
void setup(){
  size(800,500, P3D);
  arm1 = new Arm(60, 170, 10);
  arm2 = new Arm(160, 170, -10);
  smooth();
}


void draw(){
  background(130);
  strokeWeight(2);
  
  
  drawArmPair(0, 0,color(0,255,0));
  drawArmPair(200, 0,color(0,255,0));
  
  
  // here is the problem
  translate(50,150); // let's say you can't modify this
  drawArmPair(0, 0,color(255,0,0));
  drawArmPair(200, 0,color(255,0,0));

}


void drawArmPair(int x, int y, color c){

pushMatrix();
  translate(x, y);
  stroke(1);
  arm1.draw();
  arm2.draw();
  
  stroke(c);
  popMatrix();
  line(arm1.sx, arm1.sy, arm1.sz, arm2.sx, arm2.sy, arm2.sz);
}


class Arm{
  int x, y, z;
  
  float sx, sy, sz;

  Arm(int x, int y, int z){
    this.x = x;
    this.y = y;
    this.z = z;
  }
  void draw(){
    
    pushMatrix();

    int j = 1;
    float nx = x*j+millis()/10+screenX(10,10);
    float ny = y*j+ millis()/10+100; 
    translate(x,y);
    rotateX(map(noise(nx/100 ), 0f, 1f, 0f, TWO_PI));
   
    
    line(0,0, 100, 100);
    
    sx = screenX(100, 100, 0);
    sy = screenY(100, 100, 0);
    sz = screenZ(100, 100, 0);
    popMatrix();
  }

}
 

I'm trying to show a case where the "model" positions have to be partially restored.  As you can see, the green bar model works fine, but breaks once the models are translated to a different location.


The all colored bars are supposed to be attached to the arms.  I want to use modelX to be able to evaluate the location of the arms that handle the color bars, but I'm not really sure how to go about doing it.

Any suggestion?  Thanks!