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Index › Programming Questions & Help › OpenGL and 3D Libraries › resetting perspective and camera after endGL()
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resetting perspective and camera after endGL() (Read 823 times)
adm
resetting perspective and camera after endGL()
Nov 24th, 2009, 9:33am  
My Processing app does most of its drawing using straight OpenGL calls and makes adjustments to both the projection and modelview matrices. The trouble is that I'm using the ControlP5 library for some GUI stuff. Before, it was alright to have it draw before all the stuff I do between PGraphicsOpenGL.beginGL() and PGraphicsOpenGL.endGL(), but now I'm drawing a full screen quad in the OpenGL part which will occlude the GUI stuff. I'd like to draw ControlP5 after I finish my OpenGL stuff and turn off depth testing, but something with the matrices is totally off.

After calling PGraphicsOpenGL.endGL(), I call perspective() and camera() thinking that this will reset the matrix stack to how you can expect it to be at the beginning of draw(). Am I missing anything?

-Aaron
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aaron4281  
JGalt
Re: resetting perspective and camera after endGL()
Reply #1 - Nov 24th, 2009, 10:09am  
Try something like this...
Code:
PMatrix3D currCameraMatrix;
PGraphics3D g3;

void setup() {  
   size(200,200,P3D);  
   g3 = (PGraphics3D)g;  
   hint(DISABLE_DEPTH_TEST);
}

void draw(){  

   currCameraMatrix = new PMatrix3D(g3.camera);  
   camera();  //  Start HUD  
   fill(255);  
   rect(10,10,80,30);  //  End HUD  
   g3.camera = currCameraMatrix;
}

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adm
Re: resetting perspective and camera after endGL()
Reply #2 - Nov 24th, 2009, 10:26am  
No luck with that solution I'm afraid.
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aaron4281  
adm
Re: resetting perspective and camera after endGL()
Reply #3 - Nov 24th, 2009, 10:34am  
I guess a decent solution is to just reset the matrices with the Processing defaults using OpenGL commands before calling endGL().
Code:
gl.glMatrixMode(GL.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(60, width/(float)height, .1f, 1000f);
gl.glMatrixMode(GL.GL_MODELVIEW);
gl.glLoadIdentity();
glu.gluLookAt(width/2.0f, height/2.0f, (height/2.0f) / tan(PI*60.0f / 360.0f), width/2.0f, height/2.0f, 0, 0, 1, 0);


Ba-da-boom.
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aaron4281  
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