OpenGL Depth Problems

This is a discussion on OpenGL Depth Problems within the Game Programming forums, part of the General Programming Boards category; It draws only black. I'm almost completely sure that it's a depth problem. So this would be the code. Code: ...

  1. #1
    Student drdroid's Avatar
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    Question OpenGL Depth Problems

    It draws only black. I'm almost completely sure that it's a depth problem. So this would be the code.


    Code:
    GLvoid ReSizeGLScene(GLsizei width, GLsizei height)	
    {
    	if (height==0)									
    	{
    		height=1;									
    	}
    
    	glViewport(0,0,width,height);						
    
    	glMatrixMode(GL_PROJECTION);
    	glLoadIdentity();							
    	
    	glFrustum(-1.0, 1.0, -1.0, 1.0, 0.0, 1.0);
    	glTranslatef(-2.5,2.5,3.0);
    
    	glMatrixMode(GL_MODELVIEW);					
    	glLoadIdentity();							
    }
    
    int InitGL(GLvoid)							
    {
    	loadtexture();
    	glEnable(GL_TEXTURE_2D);
    	glShadeModel(GL_SMOOTH);						
    	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);			
    	glClearDepth(1.0);								
    	glEnable(GL_DEPTH_TEST);														
    	return TRUE;									
    }

  2. #2
    Crazy Fool Perspective's Avatar
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    you could try using gluPerspective...

    Code:
    void gluPerspective(GLdouble fovy,
                                    GLdouble aspect,
                                    GLdouble zNear,
                                    GLdouble zFar)

  3. #3
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    gluperspective doesn't perform frustum clipping

  4. #4
    Crazy Fool Perspective's Avatar
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    Originally posted by Silvercord
    gluperspective doesn't perform frustum clipping
    zNear and zFar specify the distance to the near and far clipping planes. so if its a depth problem (as droid thinks it is) the near/far clipping planes could be part of it.

  5. #5
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    I thought he had glfrustum in there because he wanted frustum clipping

  6. #6
    Crazy Fool Perspective's Avatar
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    Originally posted by Silvercord
    I thought he had glfrustum in there because he wanted frustum clipping
    he can still have it..

    http://www.cevis.uni-bremen.de/~uwe/...rspective.html

    DESCRIPTION
    gluPerspective specifies a viewing frustum into the world coordinate system.

  7. #7
    drdroidhere
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    I tried changing it to perspective... it didn't change anything.

  8. #8
    Registered User dalek's Avatar
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    Could you post your drawing code? It could be that you aren't swapping your buffers, or if you are using single buffered mode are you calling glFlush() at the end of your drawing routine?

    Also, make sure you are in RGBA mode, texture mapping only works in RGBA mode, and check that your texture size is a power of 2.
    Last edited by dalek; 06-19-2003 at 08:42 AM.

  9. #9
    Software Developer jverkoey's Avatar
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    he got it fixed I gave him some help over IM.........it was just a matter of using perspective view over orthographic.....

  10. #10
    Registered User dalek's Avatar
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    Ah cool.

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