When i make shapes and then export them to pdf, they are not connected. In illustrator they seem to be just many lines and i need them to be connected.

In my program i generate z-cordinate values for my vertexes. And then make series of vertical lines which differ only in  their z coordinate. I thought that when i put my loop (i dont know i can do that) between beginShape(); endShape(); that shape should be connected. But its not.

I believe the problem is in the fact that i make pdf from 3D.

Code is crazy im not great programmer sorry for that. 

2. import processing.pdf.*;
3. import processing.opengl.*;
4. 
   
5. 
   
6. int  d=50; // horizontal space between vertexes
7. float[][] val ;
8. float xSize,ySize,xxSize,yySize ;
9. float increment = 0.05; // affecting noisemap size
10. float zoff = 0.0;  
11. float zincrement = 0.005; // affecting noisemap size
12. boolean record;
13. float noize = 0.6;
14. float rozmezi = 25; // vertical space between lines
15. 
    
16. void setup(){
17.   size(1220, 780, OPENGL);
18.  xSize = 30; // number of horizontal points
19.   ySize = 15; // number of vertical line 
20.  xxSize = xSize;
21.   yySize = ySize;
22.    val = new float[int(xSize)][int(ySize)];   
23. }
24. 
    
25. void draw(){
26.     if (record) {
27.     beginRaw(PDF, "output.pdf");
28.   }
29.   
30.  background(255);
31.   noStroke();
32.   translate(100,70, -1200);
33.   noiseSeed(1);
34.   float xoff = 0.0; // Start xoff at 0
35.   noiseDetail(30, noize);
36. 
    
37.  // For every x,y coordinate in a 2D space, calculate a noise value and produce a brightness value
38.     for (int x = 0; x <  xxSize; x++) {
39.     xoff += increment;   // Increment xoff 
40.     float yoff = 0.0;   // For every xoff, start yoff at 0
41.     
42.       for (int y = 0; y < yySize; y++) {
43.       yoff += increment; // Increment yoff
44.       float z = noise(xoff,yoff,zoff)*900;
45.       val[x][y] = z;
46.     }
47.   }
48.   
49.   
50. stroke(0);
51. noFill();
52. 
    
53. //this is where i have a problem
54.  for(int y=0; y<ySize-1; y = y + 1){
55.       beginShape();
56.       for (int x=0; x<xSize-1; x = x + 1){
57.       vertex(x*d, y*rozmezi, val[x][y]);
58.     }
59.       endShape();
60.  }
61.    zoff += zincrement; // Increment zoff
62. 
    
63. 
    
64. if (record) { 
65.     endRaw();
66.     record = false;
67.   }
68.   
69. }
70. 
    
71. 
    
72. //controls
73. void keyPressed() {
74. if (key == CODED) {
75.     if (keyCode == UP) {
76.       noize = noize + 0.02;
77.     } else if (keyCode == DOWN) {
78.       noize = noize - 0.02;
79.     } 
80.     else if (keyCode == LEFT) {
81.       camera(mouseX*1.5, mouseY*2.5, (height/2.0) / tan(PI*60.0 / 360.0), 
82.          width/2.0, height/2.0, 0, // centerX, centerY, centerZ
83.          0.0, 1.0, 0.0); // upX, upY, upZ
84.   rotateX(70); 
85.     } 
86.   else if (keyCode == RIGHT) {
87.      record = true;
88.     } 
89.   }
90.  }

Like i said everything wokrs for me but i cant to find a way how to export merged lines and not many disconnected point to point lines.

I cannot find any souliton, could somebody help me please? :) Thanks