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POOpenGL Display Error - Incorrect display
 

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  1. POOpenGL Display Error - Incorrect display
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    <p>I'm learning OpenGL and I've got a problem with incorrect rendering. This is the problem I'm having, there are gaps between sides of pyramids.</p> <p><img src="https://i.stack.imgur.com/4cVq1.png" alt="enter image description here"></p> <p>Here are the vertices I'm using to construct.</p> <pre><code>// Create Pyramid Vertex Buffer FloatBuffer vertexBuffer = BufferUtils.createFloatBuffer(3 * 12); vertexBuffer.put(new float[] { // Side one 0f, 0.8f, 0f, -0.8f, -0.8f, 0.8f, 0.8f, -0.8f, 0.8f, // Side two 0f, 0.8f, 0f, 0.8f, -0.8f, 0.8f, 0.8f, -0.8f, -0.8f, // Side three 0f, 0.8f, 0f, 0.8f, -0.8f, -0.8f, -0.8f, -0.8f, -0.8f, // Side four 0f, 0.8f, 0f, -0.8f, -0.8f, -0.8f, -0.8f, -0.8f, 0.8f }); vertexBuffer.rewind(); </code></pre> <p>I thought that this was because the model comes out of screen. So I thought translating on the z-axis should be fine and I added this line before calling <code>glDrawArrays</code></p> <pre><code>glTranslatef(0f, 0f, -1f); </code></pre> <p>This came up with this strange behaviour, having more sides being drawn.</p> <p><img src="https://i.stack.imgur.com/IaS6x.png" alt="enter image description here"></p> <p>The three sides are rendered but it is only supposed to view only two! How can I solve this problem? I have also enabled the depth test.</p> <p>Here's how I initialize OpenGL</p> <pre><code>// Initialize OpenGL glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-1, 1, -1, 1, 1, -1); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glViewport(0, 0, Display.getWidth(), Display.getHeight()); </code></pre>
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    1. USSri Harsha Chilakapati
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    1. COCan you post your viewport creation code? I can't tell if the triangle is getting cut off by your near frustum or maybe far frustum or even a combination of both. I think you are seeing the inside of the pyramid in your second picture, and the back of the world in the black spot of the first picture. However, that seems counter intuative since moving further away should result in what you get in the first picture and you should see the inside of the pyramid if you move closer. Also, do you have any other transforms? And what vert parameter is mapped to which color? X->Red, Y->Green?
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    2. CO@zero298 I've included the code for initializing opengl. Also I'm not having any shaders. I've got it working with changing the glOrtho function but I still didn't understand why.
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      1. USSri Harsha Chilakapati
 

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