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Index › Programming Questions & Help › OpenGL and 3D Libraries › firt opening processing, first problem with openGL

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firt opening processing, first problem with openGL (Read 656 times)

nootropic.kint

firt opening processing, first problem with openGL
May 19^th, 2008, 11:30am

Hi!
sorry for my poor knowledge.

i'm opening exemple Array2D
in processing 0135
with intel iMac os x 10.4.11 with aty radeonX1600

i changed only size(200, 200, OPENGL); and importing lib.
everything all not chaged.
result: black stage.

other exeples with opengl run correctly.
why?
thanks
alberto

Code:


 import processing.opengl.*;
 
float[][] distances;
float maxDistance;

size(200, 200) ;//, OPENGL);
background(0);
maxDistance = dist(width/2, height/2, width, height);
distances = new float[width][height];
for(int i=0; i<height; i++) {
  for(int j=0; j<width; j++) {
    float dist = dist(width/2, height/2, j, i);
    distances[j][i] = dist/maxDistance * 255; 
  }
}

for(int i=0; i<height; i+=2) {
  for(int j=0; j<width; j+=2) {
    stroke(distances[j][i]);
    point(j, i);
  }
}

« Last Edit: May 19^th, 2008, 12:52pm by nootropic.kint »

jaylfk

Re: firt opening processing, first problem with op
Reply #1 - May 19^th, 2008, 12:27pm

Seems like point() has an issue with OPENGL renderer.

Quote:

import processing.opengl.*;

float[][] distances;
float maxDistance;

size(200, 200, OPENGL);
background(0);
maxDistance = dist(width/2, height/2, width, height);
distances = new float[width][height];
for(int i=0; i<height; i++) {
for(int j=0; j<width; j++) {
float dist = dist(width/2, height/2, j, i);
distances[j][i] = dist/maxDistance * 255;
}
}

for(int i=0; i<height; i+=2) {
for(int j=0; j<width; j+=2) {
stroke(distances[j][i]);
rect(j, i,1,1);
}
}

nootropic.kint

Re: firt opening processing, first problem with op
Reply #2 - May 19^th, 2008, 12:54pm

ok
thanks man!
so with openGL point() don't work correctly.
(why? bug? or normal differences in core processing drawing api?)

actually.. for having same result WITHOUT OPENGL i have to use:
rect(i,j, 0,0) ==== point(i,j)

but with rect(i,j, 0,0) WITH OPENGL make same result that using point..

seems to be a problem in using opengl
with single point/pixel?

but rect() is slowler then using point method. also with opengl..

how can i find some profiler or something with i can misure
a method computational time in processing.org ide?

jaylfk

Re: firt opening processing, first problem with op
Reply #3 - May 20^th, 2008, 12:56am

This is what i've got so far

Code:


import javax.media.opengl.*; 
import processing.opengl.*; 

float[][] distances;  
float maxDistance;  
 
void setup() { 
   size(200, 200, OPENGL); 
maxDistance = dist(width/2, height/2, width, height);  
distances = new float[width][height];  
for(int i=0; i<height; i++) {  
  for(int j=0; j<width; j++) {  
    float dist = dist(width/2, height/2, j, i);  
    distances[j][i] = dist/maxDistance * 255;   
    }  
  }
}
  
void draw(){
background(200,100,100);

 PGraphicsOpenGL pgl = (PGraphicsOpenGL) g;   
GL gl = pgl.beginGL();   
//gl.glEnable(GL.GL_POINT_SMOOTH);
gl.glBegin(gl.GL_POINTS); 
gl.glColor3f(0,0,0);   
for(int i=0; i<height; i+=2) {  
  for(int j=0; j<width; j+=2) {  
 gl.glVertex3f(j, i,0); 
    }  
  }
  gl.glEnd();
  pgl.endGL();  
}

You can also check this thread

http://processing.org/discourse/yabb_beta/YaBB.cgi?board=OpenGL;action=display;num=1181926021;start=1#1

nootropic.kint YaBB Newbies Offline Posts: 37	Re: firt opening processing, first problem with op Reply #4 - May 21^st, 2008, 3:17pm thanks! it runs perfectly

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