Processing 1.0 - Processing Discourse - Zbuffer depth test in P3D vs OPENGL

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Index › Programming Questions & Help › Syntax Questions › Zbuffer depth test in P3D vs OPENGL

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Zbuffer depth test in P3D vs OPENGL (Read 1027 times)

screamyguy

Zbuffer depth test in P3D vs OPENGL
Feb 4^th, 2008, 2:37am

I'm having some issues with depth testing in P3D. The following code does some rendering after using the DISABLE_DEPTH_TEST hint. In the OPENGL case, the lines render over the geometry (what I was expecting), but they are occluded in the P3D case.

Does the depth buffer hint apply in P3D mode, or am I missing something?

Quote:

import processing.opengl.*;

boolean useOPENGL = true;

void setup(){
if (useOPENGL) size(500,500,OPENGL);
else size(500,500,P3D);
}

void draw(){

unhint(DISABLE_DEPTH_TEST);
background(0);
noStroke();
fill(64);
pushMatrix();
translate(250,250);
sphere(50);
popMatrix();

hint(DISABLE_DEPTH_TEST);
stroke(255);
line(0,0,width,height);

beginShape();
vertex(width,0);
vertex(0,height);
endShape();

}

polymonkey

Re: Zbuffer depth test in P3D vs OPENGL
Reply #1 - Feb 4^th, 2008, 4:56am

You're right it doesn't work. But...

I've been using OCD to have 2 camera feeds. One for the scene and one for the GUI. The GUI is done with controlP5. I do the same disable z-test that you are doing and then call controlP5.draw() at the end of draw(). Works fine in P3D and OPENGL. But any processing shapes don't work.

I'm pretty certain that controlP5 works because it is drawing after draw(). So my thinking would be to make a class and register it to draw before or after the frame then it "should" work.

MattD(polymonkey)

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