static Character and;
String showText = "click to erase and then type away";
static final int [][] charTable = {                    //pathways of 3D isometric text, unicode indexed
  {0, 0, 2, 0, 2, 3, 0, 3, 0, 0},                      // 0
  {0, 1, 1, 0, 1, 3},                                  // 1
  {0, 0, 2, 0, 2, 1, 0, 3, 2, 3},                      // 2
  {0, 0, 2, 0, 0, 1, 2, 3, 0, 3},                      // 3
  {2, 2, 0, 2, 1, 0, 1, 3},                            // 4
  {2, 0, 0, 0, 0, 1, 2, 2, 2, 3, 0, 3},                // 5
  {2, 0, 0, 0, 0, 3, 2, 3, 2, 1, 0, 1},                // 6
  {0, 0, 2, 0, 0, 3},                                  // 7
  {0, 0, 2, 0, 0, 3, 2, 3, 0, 0},                      // 8
  {0, 3, 2, 3, 2, 0, 0, 0, 0, 2, 2, 2},                // 9
  {2, 1, 0, 3, 2, 3, 2, 1},                            // a (10)
  {0, 0, 0, 3, 2, 3, 2, 1, 0, 1},                      // b (11)
  {2, 1, 0, 1, 0, 3, 2, 3},                            // c (12)
  {2, 0, 2, 3, 0, 3, 0, 1, 2, 1},                      // d (13)
  {0, 2, 2, 2, 2, 1, 0, 1, 0, 3, 2, 3},                // e (14)
  {0, 3, 0, 0, 2, 0, 0, 1, 2, 1},                      // f (15)
  {2, 3, 0, 3, 0, 1, 2, 1, 2, 4, 0, 4},                // g (16)
  {0, 0, 0, 3, 1, 1, 2, 1, 2, 3},                      // h (17)
  {1, 1, 1, 3},                                        // i (18)
  {1, 0, 1, 4, 0, 4},                                  // j (19)
  {0, 0, 0, 3, 2, 3, 0, 2, 2, 1},                      // k (20)
  {1, 0, 1, 3},                                        // l (21)
  {0, 3, 0, 1, 1, 3, 2, 1, 2, 3},                      // m (22)
  {0, 3, 0, 1, 2, 1, 2, 3},                            // n (23)
  {0, 1, 2, 1, 2, 3, 0, 3, 0, 1},                      // o (24)
  {0, 4, 0, 1, 2, 1, 2, 3, 0, 3},                      // p (25)
  {2, 4, 2, 1, 0, 1, 0, 3, 2, 3},                      // q (26)
  {0, 3, 0, 1, 2, 1},                                  // r (27)
  {2, 1, 0, 1, 0, 2, 2, 2, 2, 3, 0, 3},                // s (28)
  {1, 3, 1, 0, 0, 1, 2, 1},                            // t (29)
  {0, 1, 0, 3, 2, 3, 2, 1},                            // u (30)
  {0, 1, 1, 3, 2, 1},                                  // v (31)
  {0, 1, 0, 3, 1, 1, 2, 3, 2, 1},                      // w (32)
  {0, 1, 2, 3, 0, 3, 2, 1},                            // x (33)
  {0, 1, 0, 3, 2, 1, 2, 4, 0, 4},                      // y (34)
  {0, 1, 2, 1, 0, 3, 2, 3}                             // z (35)
  };
QuadChar [] alphabet = new QuadChar[36];
void setup(){
  size(800, 300, P3D);
  and = new Character('0');
  quadTextSize(8);
  stroke(255);
  noFill();
}
void draw(){
  background(0);
  quadText(showText, mouseX, mouseY);
}
void keyPressed(){
  showText += and.toString(key);
}
void mousePressed(){
  showText = "";
}