Hi,

probably this is a know issue, so can please somebody confirm it.

I draw an image via:

pImage = loadImage(image.getPath());
noStroke();
image(pImage, min, min, max, max);

Usually I use P3D and everything is fine. When using OPENGL the image is not drawn. Does the image overlay not work with OpenGL or is it my fault?

Cheers,
sb

Hmm...I tried to fix the problem and after a couple of hours of trial and error I can at least fix it, although I don't understand the details.

Here is what I do:

textMode(SCREEN);

background(...);

image(...);

popMatrix
a lot of transformations
some heavy load drawing (many cubes, lines etc.)
pushmatrix


Solution:
It seems the textMode(SCREEN) invokation does prevent the picture from being drawn.

I believe the problem is either:

A) the background() command deletes the drawn image in this case, although it is issued before the image() invocation. Now if I use textMode(SCREEN) and comment out background the image seems to be drawn.

B) the textMode(SCREEN) method affects somehow the coordinate system, so the image will be drawn but won't be visible since it is drawn in some non-visible place in the coordinate system.

The solution is to not use textMode(SCREEN). This is very anoying since I only switched it on once where I worked with text, which I don't do anymore. This is the most problematic part of the else great processing, that seemingly unconnectable parts effect each other. This is very hard to debug

should you use pushMatrix() and then popMatrix() and not the other way around ? unless you made a mistake when posting. otherwise it works just fine

example using image() before any push/pop. works fine


-----------------------------------------
import processing.opengl.*;

PImage img;

float min = 0;
float max = 500;

void setup()
{
 size( 500, 500, OPENGL );
 
 img = loadImage( "test.png" );
 
 noStroke();
}

void draw()
{
 float time = millis() * 0.001;
 
 image( img, min, min, max, max );
 
 for( int i=0; i<300; i++ )
 {
   fill( i, i, 0, 128 );
   pushMatrix();
   translate( i*2, i*2, 0 );
   rotateZ( 20*sin(i*3 + time * 0.5) );
   rect( 0, 0, 20, 20 );
   popMatrix();
 }  
}

my guess is you messed with the viewmatrix and image is drawing somewhere else. follow your code and see what you're doing.