Hello all,

How might I modify this code so it draw only based on mouse click, and I can drag only the shape that I choose with the mouse?

1. 
   import peasy.*;
   import kGeom.*;
   import processing.opengl.*;
   
   PeasyCam cam;
   int depth = 600;
   
   void setup(){
     size(600,400,OPENGL);
     cam = new PeasyCam(this, 600);
     smooth();
   }
   
   void draw(){
     background(0);
     stroke(0);
     strokeWeight(1);
     //noFill();
     fill(255);
   
     float pSize = 100;
   
     draw_tetrahedron(new kVec(0,0,0),pSize);
   
   
   }
   //---------------------------------------------------------------------------------------
   // This function will draw a tetrahedron (4 sided solid) to the screen.
   void draw_tetrahedron(kVec pos,float pSize){
     pushMatrix();
     translate(pos.x,pos.y,pos.z);
     scale(pSize);
     float[] four_sided_x = {
       0, (2*sqrt(2))/3, -sqrt(2)/3, -sqrt(2)/3              };
     float[] four_sided_y = {
       0, 0, sqrt(6)/3, -sqrt(6)/3              };
     float[] four_sided_z = {
       1, -1/3, -1/3, -1/3              };
   
     int[] tetra_vertex_faces_0 = {
       0, 1, 2              };
     int[] tetra_vertex_faces_1 = {
       0, 2, 3              };
     int[] tetra_vertex_faces_2 = {
       0, 3, 1              };
     int[] tetra_vertex_faces_3 = {
       1, 3, 2              };
     int[][] tetrahedron_array = {
       tetra_vertex_faces_0,tetra_vertex_faces_1, tetra_vertex_faces_2, tetra_vertex_faces_3               };
   
     beginShape(TRIANGLES);
     for (int e=0; e<tetrahedron_array.length;e++)
     {
       for (int f=0; f<tetrahedron_array[e].length;f++)
       {
         vertex(four_sided_x[tetrahedron_array[e][f]], four_sided_y[tetrahedron_array[e][f]], four_sided_z[tetrahedron_array[e][f]]);
       }
     }
     endShape();
     popMatrix();
   }