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Index › Programming Questions & Help › OpenGL and 3D Libraries › how to - 2d overlay to dynamic 3d view
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how to - 2d overlay to dynamic 3d view (Read 2855 times)
sam_mcelhinney
how to - 2d overlay to dynamic 3d view
May 13th, 2010, 2:52am  
Hi All

just started experimenting with 3d processing for a few things after a good while in the 2d world.

here's a link to a little sketch which uses the ocd libraries to set up a camera that explores a simple cube array (with 'solidity' expressed by the cubes). Camera control is via simple mouse movement; try it out and you'll soon learn it...

http://dl.dropbox.com/u/6460407/_00_SANDBOX.zip

what i'd like to do is have a simple 2d overlay to what is seen - ie an hud type display.

I've had a brief look through discourse but can't see a conclusive and simple way of doing this; does anyone have any thoughts/pointers

Many thanks
S
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Cedric
Re: how to - 2d overlay to dynamic 3d view
Reply #1 - May 13th, 2010, 3:52am  
this is an example on how to use controlp5 with peasycam. but as far as i undertood it should also work for your purpose.
Give it a try and put whatever you want to draw where  controlP5.draw(); is atm.

http://code.google.com/p/controlp5/source/browse/trunk/examples/controlP5WithPea...
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sam_mcelhinney
Re: how to - 2d overlay to dynamic 3d view
Reply #2 - May 13th, 2010, 12:01pm  
Cedric,

fantastic, works like a charm. Much appreciated.

http://dl.dropbox.com/u/6460407/_00_SANDBOX.zip

^^revised code for anyone who wants to do this.

S
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sam_mcelhinney
Re: how to - 2d overlay to dynamic 3d view
Reply #3 - May 14th, 2010, 1:50am  
Ah, one quickie:

Currently this approach draws the 2d view 'below' the 3d - so when objects appear in perspective they block those seen in plan. see link...

http://dl.dropbox.com/u/6460407/_00_SANDBOX.zip

any thoughts on how to reverse this

S
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sam_mcelhinney
Re: how to - 2d overlay to dynamic 3d view
Reply #4 - May 14th, 2010, 8:37am  
for anyone watching; i did it

gui void becomes this:

Code:
void gui() {
   camera();
   javax.media.opengl.GL gl=((PGraphicsOpenGL)g).beginGL();
   gl.glClear(javax.media.opengl.GL.GL_DEPTH_BUFFER_BIT);
   gl.glDisable(javax.media.opengl.GL.GL_BLEND);
   ((PGraphicsOpenGL)g).endGL();
   fill(0,0,0,255);
   for (int i = 0; i < cubes.length; i++){
     rect(cubes[i].keyX+50,cubes[i].keyY+50,10,10);
   }
   fill(255,0,0);
   ellipse(viewerX+50,viewerZ+50,5,5);
}


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yelele_eu
Re: how to - 2d overlay to dynamic 3d view
Reply #5 - May 14th, 2010, 9:04am  
damkjer library is missing ?
What library have to be dowloaded ?

Edit : OCD one ... ok.
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