3d brush - OpenProcessing

mySketch
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float cvRot;
float xV;
String Brush = "normal";
​
int tick;
​
ArrayList < Paint > painting = new ArrayList < Paint > ();
​
void setup() {
  size(1000, 1000, P3D);
  xV = width / 2;
  background(35, 35, 35);
}
​
void draw() {
  lights();
  background(35, 35, 35);
​
  fill(255);
  textAlign(CENTER, TOP);
  textSize(32);
  text("Rotation: " + String(round(cvRot)), width / 2, 0);
  text("Brush: " + Brush, width / 2, 40);
  if (keyPressed) {
    if (key == 'a' || key == 'A') {
      cvRot += 0.05;
    }
    if (key == 'd' || key == 'D') {
      cvRot -= 0.05;
    }
  }
​
  if (mousePressed) {
    if (Brush == "erase") {
      erase();
    } else {
      painting.add(new Paint(mouseX - xV, mouseY));
    }
  }
​
  translate(xV, 0, 0);
​
  for (Paint mark: painting) {
    mark.render();
  }
​
  tick++;
}
​
void erase() {
  for (int i = 0; i < painting.size(); i++) {
    if (abs(painting.get(i).yP - mouseY) < 5) {
      painting.remove(painting.get(i));
      i--;
    }
  }
}
​
void keyPressed() {
  if (key == '1') {
    Brush = "normal";
  }
  if (key == '2') {
    Brush = "sizenamic";
  }
  if (key == '3') {
    Brush = "diamond";
  }
  if (key == '4') {
    Brush = "scribble";
  }
  if (key == 'r' || key == 'R') {
    painting.clear();
  }
  if (key == 'e' || key == 'E') {
    Brush = "erase";
  }
}
​
class Paint {
  float xP, yP, yR;
  String br;
​
  Paint(float x, float y) {
    xP = x;
    yP = y;
    br = Brush;
    yR = cvRot;
  }
​
  void render() {
    pushMatrix();
​
    noStroke();
    rotateY(cvRot - yR);
    translate(xP, yP);
​
    if (br == "normal") {
      fill(255);
      box(20);
    } else if (br == "sizenamic") {
      fill(255);
      box((xP + yP) * 0.1);
    } else if (br == "diamond") {
      fill(255);
      rotateX(tick / 10);
      rotateZ(tick / 10);
      sphereDetail(2);
      sphere(20);
    } else if (br == "scribble") {
      fill(255);
      stroke(255);
      strokeWeight(10);
      line(random(-20, 20), random(-20, 20), random(-20, 20), random(-20, 20));
    }
​
    popMatrix();
  }
}