HI all,

I am a beginner in Processing. I am trying to play with my kinect and to simulate a light/shade effect on a body shape.
My first question is about the relation between stroke and light effect. I managed to get a shade effect on a sphere if there is noStroke(). Why the fact to set a stroke value makes the shade effect fail ?

pointLight(250, 250, 250, 0, 750, 1000);
noStroke();
//stroke(250.0,250.0,250.0);    // with or without stroke
translate(0,0,500.0);
fill(250,250,250);
sphere(100);

My second question is about the 3D body shape obtained thanks to the Kinekt. I got the 3D body shape through some basic codes (proposed in SimpleOpenNI examples) :

beginShape(POINTS);
  for(int y=0;y < context.depthHeight();y+=10)
  {
    for(int x=0;x < context.depthWidth();x+=10)
    {
      index = x + y * context.depthWidth();
      if(depthMap[index] > 0)
      {
        // draw the projected point
        realWorldPoint = context.depthMapRealWorld()[index];
        point(realWorldPoint.x,realWorldPoint.y,realWorldPoint.z);
       }
     }
  }
  endShape();

but the light has no effect on it. I have the intuition that is linked to the first question. Maybe a list of Points doesn't make a solid texture and so no light effect on it.

Could someone answer my two questions and give me some hints to produce a 3D body shape with a shade effect ?

Any recommended tutorial on the subject is much welcome as well :D !

Many thanks for your help.

Nexx Oko
 
import SimpleOpenNI.*;
import processing.opengl.*;

SimpleOpenNI context;
float        zoomF =0.5f;
float        rotX = radians(180);  // by default rotate the hole scene 180deg around the x-axis,
                                   // the data from openni comes upside down
float        rotY = radians(0);
boolean      autoCalib=true;


void setup()
{
  size(1024,768,P3D);  // strange, get drawing error in the cameraFrustum if i use P3D, in opengl there is no problem
  context = new SimpleOpenNI(this);
  if(context.isInit() == false)
  {
     println("Can't init SimpleOpenNI, maybe the camera is not connected!");
     exit();
     return; 
  }
 
   frame.setResizable(true);
  // disable mirror
  context.setMirror(false);

  // enable depthMap generation
  context.enableDepth();



  stroke(255,255,255);
  smooth(); 
  perspective(radians(45),
              float(width)/float(height),
              10,150000);

   frameRate(80);
 }

 
void draw()
{

  context.update();
  background(0,0,0);
 
  // set the scene pos
  translate(width/2, height/2, 0);
  noStroke();
  stroke(50.0,50.0,70.0);
 
  rotateX(rotX);
  rotateY(rotY);
  scale(zoomF);
 
  int[]   depthMap = context.depthMap();
  int     index;
  PVector realWorldPoint;
 

  pointLight(250, 250, 250, 0, 750, 1000);
  noStroke();
  //stroke(250.0,250.0,250.0);
  translate(0,0,500.0);
  fill(250,250,250);
  sphere(100);
 
  stroke(250.0,250.0,250.0);
 
  
  beginShape(POINTS);
  for(int y=0;y < context.depthHeight();y+=10)
  {
    for(int x=0;x < context.depthWidth();x+=10)
    {
      index = x + y * context.depthWidth();
      if(depthMap[index] > 0)
      {
        // draw the projected point
        realWorldPoint = context.depthMapRealWorld()[index];
        point(realWorldPoint.x,realWorldPoint.y,realWorldPoint.z);
       }
     }
  }
  endShape();
 
}