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Index › Programming Questions & Help › OpenGL and 3D Libraries › Processing OPENGL image background
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Processing OPENGL image background (Read 2355 times)
10production
Processing OPENGL image background
Apr 22nd, 2009, 11:33am  
Hello
Please help with this:

import processing.opengl.*;
PImage img;

void setup() {
 size(800, 800, OPENGL);
 smooth();
 frameRate(30);
 img = loadImage("bg.png");
}

void draw() {
 background(img);
 
 pushMatrix();
   translate(width/2, height/2, 0);
   rotateX(0);
   rotateY(10);
   strokeWeight(1);
   stroke(255,100);
   fill(255,10);
   box(200);
 popMatrix();

}

I set an image as background.
When i use OPENGL renderer, object (box) isn't displayed.
When i use change renderer to P3D, it's OK;

In OPENGL oject is shown only when i set background color -> background(50);

HOW TO DISPLAY OBJECTS in OPENGL when i'm using image background ?
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pedro veneroso
Re: Processing OPENGL image background
Reply #1 - Apr 22nd, 2009, 11:38am  
try removing background(img); from draw and substituting it with image(img, 0, 0, width, height);
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marginalia project: http://www.marginaliaproject.com
diachronic blending: http://www.vimeo.com/4205136
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10production
Re: Processing OPENGL image background
Reply #2 - Apr 22nd, 2009, 12:04pm  
It works BUT image(img,0,0,width,height); is now like a wall.
The half of an object disappeared.

Sad

I'm looki for option sets the image  as independent background which don't influent objects only refresh display when used  loop();
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pedro veneroso
Re: Processing OPENGL image background
Reply #3 - Apr 22nd, 2009, 1:36pm  
i don't think i understand exactly what you mean by 'is not like a wall'. what is the size of your image and what is happening that you don't want to happen? the half of the object which disappeared is from the background image? or was the box cut in half?

i suppose that if the image has no z axis it is drawn on z = 0 [and this way it would cut your box on half, while the z coordinate to which you translate to create it is 0]; so you could try translating the box width/2, height/2, 100 [or more on the z axis] to see if it works. if you want the box to appear to have the same size as before you can decrease its size.

this way you don't have an independent background, but you can still develop your code taking into account that no object should be drawn within a specific distance from the background.
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marginalia project: http://www.marginaliaproject.com
diachronic blending: http://www.vimeo.com/4205136
WWW  
10production
Re: Processing OPENGL image background
Reply #4 - Apr 22nd, 2009, 1:48pm  
I left image on the same position but change 'Z' coordinate in object translation:

translate(width/2, height/2, 400);

Now object 'doesn't touch' image wall Smiley

Ok it works but i'm wondering why background(img) works with P3D nor with OPENGL (objects not displayed)

Thank You for help.
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pedro veneroso
Re: Processing OPENGL image background
Reply #5 - Apr 22nd, 2009, 1:57pm  
you're welcome.

i actually couldn't figure it out, i mean, why background doesn't work with opengl... at some point i just decided to give up, move on and work with the options i had...
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marginalia project: http://www.marginaliaproject.com
diachronic blending: http://www.vimeo.com/4205136
WWW  
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