Processing 1.0 - Processing Discourse - Left eye / right eye output: lighting query

We closed this forum 18 June 2010. It has served us well since 2005 as the ALPHA forum did before it from 2002 to 2005. New discussions are ongoing at the new URL http://forum.processing.org. You'll need to sign up and get a new user account. We're sorry about that inconvenience, but we think it's better in the long run. The content on this forum will remain online.

Index › Programming Questions & Help › OpenGL and 3D Libraries › Left eye / right eye output: lighting query

‹ Previous Topic | Next Topic ›

Pages: 1

Left eye / right eye output: lighting query (Read 617 times)

Alasdair Turner

Left eye / right eye output: lighting query
Jan 17^th, 2006, 5:24pm

We're trying to play around with some real 3D, outputing to two adjacent viewports, and wondered if anyone had any ideas how to light the scene. The source below will light the right eye but not the left eye:

--
import processing.opengl.*;
import net.java.games.jogl.*;
void setup()
{
size(600,300,OPENGL);
}
void draw()
{
lights();
background(128);
GL gl = ((PGraphicsGL)g).gl;
gl.glViewport(0,0,300,300); // Left eye
camera(50, 150, 150 / tan(PI*60.0 / 360.0), 150, 150,0,0,1,0);
drawscene();
gl.glViewport(300,0,300,300); // Right eye
camera(250, 150, 150 / tan(PI*60.0 / 360.0), 150, 150,0,0,1,0);
drawscene();
}
void drawscene()
{
pushMatrix();
translate(150,150);
box(50,50,50);
popMatrix();
}

Lecturer in Architectural Computing&&Bartlett School of Graduate Studies&&UCL Gower Street London WC1E 6BT

JohnG

Re: Left eye / right eye output: lighting query
Reply #1 - Jan 17^th, 2006, 10:48pm

The lighting does work. I think you've unluckily managed to pick the exact position where the two sides of the box are lit the same for the left eye.

If you add a variable rotation, you can see it being lit properly. (I've also added a perspective() command to sort out the stretching for you)

Code:

import processing.opengl.*;
import net.java.games.jogl.*;

float a;

void setup()
{
   size(600,300,OPENGL);
   perspective(PI/3.0,1,0.1,1000);
   a=0;
}
void draw()
{
  a+=0.01;
  lights();
  background(128);
  GL gl = ((PGraphicsGL)g).gl;
  gl.glViewport(0,0,300,300);    // Left eye
  camera(50, 150, 150 / tan(PI*60.0 / 360.0), 150, 150,0,0,1,0);
  drawscene();
  gl.glViewport(300,0,300,300);  // Right eye
  camera(250, 150, 150 / tan(PI*60.0 / 360.0), 150, 150,0,0,1,0);
  drawscene();
}
void drawscene()
{
  pushMatrix();
  translate(150,150);
  rotateY(a);
  box(50,50,50);
  popMatrix();
}

Pages: 1

‹ Previous Topic | Next Topic ›