Confusiong Rendering

Programming Questions

bananaext..

in Programming Questions • 3 years ago

It seams Processing does what it wants with me, then i try drawing something like this in P3D or OPENGL

PImage a=loadImage("picture.jpg");
beginShape();
texture(a);
vertex(0, 0, 0, 0);
vertex(100,0 , 1, 0);
vertex(100, 100, 1,1 );
vertex(0,100 , 0, 1);
endShape();

it works fine if i call it from the setup() but not if i dare to put the same code in one of my classes.
Then Processing will just render nothing so i tested if the code is executed and it is.
So why the fuck did this all work then i still used 2D.
I only changed because i didnt want to rezize my pictures all the time but now its only gray.
I have this thought that my processing is broken.

Maybe some of you have encountered similar problems and can tell me what to do

ps: dont say i should not use classes, project got to big to change that now.

Replies(3)

bjordal

Re: Confusiong Rendering

3 years ago

you forgot:

textureMode(NORMALIZED);

import processing.opengl.*;

class Test{
PImage a;
public Test(){
    a = loadImage("image4.jpg");
}
public void render(){
    beginShape();
    texture(a);
    vertex(0, 0, 0, 0);
    vertex(100,0 , 1, 0);
    vertex(100, 100, 1,1 );
    vertex(0,100 , 0, 1);
    endShape();
}
}
Test t;
void setup(){
size(400,400,OPENGL);
t = new Test();
textureMode(NORMALIZED);
}

void draw(){
t.render();
}

works for me

bananaext..

Re: Confusiong Rendering

3 years ago

I seam to have found my error
My program was more like this

void draw(){
do {
t.render();
}
while (true);
}

I did not realize that the image is only sent out then draw() is finished so my screen was white.

Is there a way to force out the current rendered picture without waiting for draw() to end?

PhiLho

Re: Confusiong Rendering

3 years ago

That's a quite common error.
Instead of looping inside draw(), just use it as the loop engine, since it is called regularly anyway. No need to force a redraw.

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