i was playing with the extrude pixel file under the 3d & open gl files.  i was trying to export the points as a .dxf (or .txt or .obj).  the app. runs fine but doesn't export the file into the sketch folder.  

here's the code that i was working with, almost line for line for the extrude file but added in the file export commands to export the file:

import processing.dxf.*;

boolean record = false;

PImage a;
boolean onetime = true;
int[][] aPixels;
int[][] values;
float angle;


void setup() {
 size(400, 400, P3D);
 
 aPixels = new int[width][height];
 values = new int[width][height];
 noFill();

 // Load the image into a new array
 // Extract the values and store in an array
 a = loadImage("DSCN1038.jpg");
 for (int i=0; i<height; i++) {
   for (int j=0; j<width; j++) {
     aPixels[j][i] = a.pixels[i*width + j];
     values[j][i] = int(blue(aPixels[j][i]));
   }
 }
}

void draw() {
 background(0);
 
 // Update and constrain the angle
 angle += 0.005;
 if (angle > TWO_PI) { angle = 0; }
 
 // Rotate around the center axis
 translate(width/2, 0, 128);
 rotateY(angle);  
 translate(-width/2, 0, 128);
 
 // Display the image mass
 for (int i=0; i<height; i+=2) {
   for (int j=0; j<width; j+=2) {
     stroke(values[j][i]);
     point(j, i, -values[j][i]);
   }
 }
 if (record == true) {
   endRaw();
   record = false;
 }
}

void keyPressed() {
 if (key == 'R' || key == 'r') {
   record = true;
 }
}




any comments are helpful and apprecited

You're missing the
Code:

  if (record) {
    beginRaw(DXF, "output.dxf");
  } 

block.