I have a gravity program that i have made and just recently made it 3d but it is now when i start it slowly zooming in or out. Please respond. Here is the code.






PFont font;
int pl = int(random(2,20));
Planet[] planets = new Planet[pl];


void setup() {
 size(1000,1000, P3D);
 stroke(0);



 for (int i = 0; i< planets.length; i++ ) {
   float x = random(1,1000);
   float y = random(1,1000);
   float z = random(1,1000);
   int xy = int (x*1);
   int yx= int (y*1);
   int zz= int ((z*1)-500);
   int co = int(random(1,255));
   int col = int(random(1,255));
   int colo = int(random(1,255));
   float dimeter = random(6,45);
   float velx1 = random(-2.5,2.5);
   float vely1 = random(-2.5,2.5);
   float velz1 = random(-2.5,2.5);
   // float vely1 = -velx1;
   if (i == planets.length-1){
     xy = width/2;
     yx = height/2;
     zz = 0;
     dimeter = 125;
     velx1 = 0;
     vely1 = 0;
   }

   planets[i] = new Planet(dimeter,xy,yx,zz,co,col,colo,i,velx1,vely1,velz1);
 }

}


void draw() {


camera(width/2.0, height/2.0, (height/2) / tan(PI*60.0 / 360.0), width/2.0, height/2.0, 500, 0, 1, 0);
 lights();
 for (int i = 0; i < planets.length; i++ ) {

   planets[i].display(i);
   planets[i].update();
  // planets[i].checkEdges();




 }






}
class Planet {
 int t;
 float xcc = 0;
 float ycc = 0;
 float zcc = 0;
 float xpos;
 float ypos;
 float zpos;
 float diameter;
 int sunypos = 500;
 int sunxpos = 500;
 float gravmax = .1;
 int col1;
 int col2;
 int col3;
 int curplanet;
 int num;
 int i = 1;




 Planet(float diameter_,float xpos_,float ypos_,float zpos_,int co1,int co2,int co3,int planet,float velx,float vely,float velz) {
   diameter =  diameter_;
   xpos = (xpos_);
   ypos = (ypos_);
   zpos = (zpos_);
   col1 = co1;
   col2 =co2;
   col3 =co3;
   curplanet = planet;
   xcc = velx;
   ycc= vely;
   zcc = velz;
 }

 void update() {

   // float area = (((diameter/2)*(diameter/2))*3.1415);

   for (int i = 0;i < planets.length; i++) {
     if(i == curplanet){
       continue;
     }
     if(planets.length-1 ==curplanet){
       continue;
     }
     float area1 = ((((planets[i].diameter/2))*(planets[i].diameter/2)*(planets[i].diameter/2))*3.1415);
     float disty = (planets[i].ypos-ypos);
     float distx = (planets[i].xpos-xpos);
     float distz = (planets[i].zpos-zpos);
     float distfull = sqrt((distz*distz)+(distx*distx+disty*disty));
     if (distfull < (planets[i].diameter/2)){
       continue;
     }
     float acc = (.01) *(area1/(distfull*distfull));
     // print(" dist x="+distx);
     // print(" dist y="+disty);
     // print(" full="+distfull);
     // println(" acc="+acc);
     //.0000000000667*distx
     zcc = zcc +  (acc*distz/distfull);
     xcc = xcc +  (acc*distx/distfull);
     ycc = ycc +  (acc*disty/distfull);
   }
   zpos = zpos + zcc;
   xpos = xpos + xcc;
   ypos = ypos + ycc;




 }
/* void checkEdges() {

   if (xpos > width -(diameter/2)) {
     xcc = -xcc;
   }
   else if (xpos < diameter/2) {
     xcc = -xcc;
   }

   if (ypos > height - (diameter/2)) {
     ycc = -ycc;
   }
   else if (ypos < diameter/2 ) {
     ycc = -ycc;
   }


 }*/

 void display(int ti) {
   t = ti+1;


   stroke(0);
   // print(" ycc" +ycc);
   // println(" xcc" +xcc);
   // println(diameter+"diam");

   if(curplanet == i){
     fill(0,0,0,10);

        background(0);


   }


   if(curplanet != 0){
     fill(col1,col2,col3);
   }
   else{
     fill(255,255,255);
   }
   if(curplanet == planets.length -1){
     fill(255,255,0,233);



   }
   //ellipse(int(xpos),int(ypos),diameter,diameter);

   noStroke();
           pushMatrix();
   translate(xpos, ypos, zpos);

   sphere(diameter);

       popMatrix();



 }





}