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POOpenGL: Can see through one wall but not the other
 

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  1. POOpenGL: Can see through one wall but not the other
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    <p>I do not know whether this is a depth buffer issue or another. I can see through one wall but not another:</p> <p><img src="https://i.stack.imgur.com/1N6bp.png" alt="Wall viewable"></p> <p>Now when I rotate so the second wall becomes more prominent:</p> <p><img src="https://i.stack.imgur.com/0wGDn.png" alt="enter image description here"></p> <p><img src="https://i.stack.imgur.com/Fluev.png" alt="enter image description here"></p> <p>I have the depth buffer enabled in Interface Builder. My OGL enables look like this:</p> <pre><code>// enables glEnable(GL_BLEND); glEnable(GL_DEPTH_TEST); glEnable(GL_SMOOTH); glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); //glEnable(GL_CULL_FACE); //glCullFace(GL_BACK); glFrontFace(GL_CCW); //glDepthMask(GL_TRUE); //glDepthFunc(GL_LESS); </code></pre> <p>Any suggestions. I commented out the other enables as they did not seem to help.</p> <p>As request, here is the projection and modelview setup:</p> <pre><code>// initialize all rotation matrices, translation matrix, and model view matrix to identity rotateX = GLKMatrix4Identity; rotateY = GLKMatrix4Identity; rotateZ = GLKMatrix4Identity; modelMat = GLKMatrix4Identity; zNear = 0.1; zFar = 1000.0; frustumScale = 1.0; //GLint maxbuffers; //glGetIntegerv(GL_MAX_DRAW_BUFFERS, &amp;maxbuffers); //NSLog(@"Max. number of buffers: %d", maxbuffers); // called? NSLog(@"awakeFromNib called..."); // set the aspect ratio here NSSize dim = [self frame].size; aspectRatio = dim.width/dim.height; // compute the projection matrix projMat = GLKMatrix4MakePerspective(frustumScale, aspectRatio, zNear, zFar); ... // compute the model matrix GLKMatrix4 tempLeft = GLKMatrix4Multiply(rotateX, rotateY); GLKMatrix4 tempRight = GLKMatrix4Multiply(rotateZ, translation); modelMat = GLKMatrix4Multiply(tempLeft, tempRight); </code></pre>
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    1. COAre you sure you actually _have_ a depth buffer?
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    2. COA missing depth buffer would be the default guess — assuming the face with no green on it is drawn second? It's hard to figure out what's going on given that you've got one explicitly ticked in IB and you've enabled though. What do you get if you log out a `CGLDescribePixelFormat` call to `openglView.pixelFormat.CGLPixelFormatObj` with `kCGLPFADepthSize`?
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    3. COAlso: enabling glCullFace should have hidden the problem (without resolving it) given that your geometry is convex. Are you sure the enables are performed at all?
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      1. USTommy
 

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