I am trying to put webcam image onto polygons as a texture so that i can morph image quickly etc.
The problem is, that i created a few Pgraphics3 images to use as buffer for camera so that i can compute difference image between two frames (i dont think that pgraphics3 is problem as it works the same with PImage). The 'bug' I encounter is that processing puts the image from camera into very random places - in the following program, i copy pixels from camera into one of the buffers called current with current.pixels=camera.pixels; command (makes same bug when copying pixel-by-pixel in a loop). But after that, the 'camera' image updates every tenth frame, while when i texture polygon with 'diff' image (which is empty and i haven't done anything with it after creating), it contains smooth video that should have been in 'camera' and 'current' variables (how strange - how did it get there???).
Can anyone please point me in a right direction?
Thanks!

Code:

import processing.opengl.*;
import processing.video.*;

int camx=320; int camy=240;
  PGraphics3 last = new PGraphics3(camx,camy,null);
  PGraphics3 current = new PGraphics3(camx,camy,null);
  PGraphics3 diff = new PGraphics3(camx,camy,null);
boolean newFrame;
Capture camera;

void setup() 
{
  size(800,600, OPENGL);
  noStroke();
  
  camera = new Capture(this, camx, camy, 30);
  newFrame=false;
}

void captureEvent(Capture camera)
{
 camera.read();
 newFrame=true;
}


void draw() 
{
  if (newFrame==true) {
    newFrame=false;
    /* //THIS WORKS THE SAME
    for (int i = 0; i < (camx*camy); i++){
      current.pixels[i]=camera.pixels[i];
    }
    */
    current.pixels=camera.pixels;
    //there will be a lot more going on here, but after i get this running
  }

    
  float x = mouseX - width/2;
  background(255);
  translate(0,0);
  //rotateZ(radians((mouseY-height/2)/10));
  
  int ctverec=50;
  float presahX=2*((mouseX - width/2)/1.33);
  float presahY=2*((mouseY - height/2));
  
  textureMode(NORMALIZED);
  for(float i=0; i<height; i+=ctverec) {
    for(float j=0; j<width; j+=ctverec) {
      beginShape(QUADS);
      texture(camera);
      vertex( (j)         ,(i)         , 0, (j-presahX)/width           ,           (i-presahY)/height);
      vertex( (j)         ,(i)+ctverec , 0, (j-presahX)/width , (i+ctverec+presahY)/height);
      vertex( (j)+ctverec ,(i)+ctverec , 0, (j+ctverec+presahX)/width , (i+ctverec+presahY)/height);
      vertex( (j)+ctverec ,(i)         , 0, (j+ctverec+presahX)/width           ,           (i-presahY)/height);
      endShape();
    }  
  }


    if(keyPressed) { 
      if (key == 's' || key == 'S') { //saving
        String filename;
        filename=("grk_"+String.valueOf(year())+String.valueOf(month())+String.valueOf(day())+'-'+String.valueOf(hour())+String.valueOf(minute()+String.valueOf(second())));
        save(filename);
        println("Saved "+filename+"...");
      }
    } else {
      //only draw if we aren't saving
      //preview of camera
      beginShape(QUADS);
      texture(camera); // THIS DRAWS CAMERA'S IMAGE AT ABOUT 1 FPS???
      vertex(0  ,  0, 0, 0, 0);
      vertex(0  ,120, 0, 0, 1);
      vertex(160,120, 0, 1, 1);
      vertex(160,  0, 0, 1, 0);
      endShape();
      //preview of diff - difference image
      beginShape(QUADS);
      texture(diff); // THIS ACTUALLY DRAWS SMOOTH CAMERA'S IMAGE - WHERE THE HECK HAS IT GOT THERE???
      vertex(160,  0, 0, 0, 0);
      vertex(160,120, 0, 0, 1);
      vertex(320,120, 0, 1, 1);
      vertex(320,  0, 0, 1, 0);
      endShape();
    }  
}
 

Thak you very much, Fry . updatePixels() did the trick, i thought this is done automatically. Thanks again, both for the advice and for wonderful Procesing