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Index › Programming Questions & Help › Programs › 2D HUD in 3D Program
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2D HUD in 3D Program (Read 1000 times)
pKlopping
2D HUD in 3D Program
Apr 22nd, 2008, 4:35am  
Hey, so I did do several searches looking to see if anyone else posted this already, but I couldn't find any.

I have a program that lets the user move around in a 3D environment. I have it printing data to the screen for debugging and what not, but I would like more contrast between the background and the text. So what I would like to do is make something like a 2D Heads Up Display that's stationary on the screen, while the 3D background moves at will.

Anyone have any ideas?

I couldn't find any way to make a box or rectangle on the screen without it actually being in the 3D environment.

I hope I was clear enough, if I didn't make enough sense just ask and I'll try to make it more clear.

Thank you everyone for whatever help you do offer,
-Paul
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JohnG
Re: 2D HUD in 3D Program
Reply #1 - Apr 22nd, 2008, 11:06am  
You need to do 2 things really, reset the camera, and clear the z-buffer.

P3D version:
Code:
camera();
for(int i=0;i<((PGraphics3D)g).zbuffer.length;i++)
{
  ((PGraphics3D)g).zbuffer[i]=Float.MAX_VALUE);
}


OpenGL:
Code:
import javax.media.opengl.*; //at top of file
...
camera();
((PGraphicsOpenGL)g).gl.glClear(GL.GL_DEPTH_BUFFER_BIT);
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Formant
Re: 2D HUD in 3D Program
Reply #2 - Apr 22nd, 2008, 3:31pm  
Hi,

Hope you don't think i'm hijacking your thread (it is the same problem)...

But how do you get this to work if you are using additive blending (as described by Flight404 here: http://www.processingblogs.org/2007/03/31/mini-tutorial-additive-blending/ ). Because it uses gl.glDisable(GL.GL_DEPTH_TEST); to get rid of an overlapping problem with textures.

I've tried loads of things, including the in-built Processing hint/unhint to disable depth testing, gl stuff etc. Any ideas?
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pKlopping
Re: 2D HUD in 3D Program
Reply #3 - Apr 22nd, 2008, 5:52pm  
Hey John, Thanks!
Works like a charm, thank you : )
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