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POWhat are the texture coordinates for a cube in OpenGL?
 

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  1. POWhat are the texture coordinates for a cube in OpenGL?
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    <p>I have a cube defined as:</p> <pre><code>float vertices[] = { -width, -height, -depth, // 0 width, -height, -depth, // 1 width, height, -depth, // 2 -width, height, -depth, // 3 -width, -height, depth, // 4 width, -height, depth, // 5 width, height, depth, // 6 -width, height, depth // 7 }; </code></pre> <p>and I have image 128x128 which I simply want to be painted on each of the 6 faces of the cube and nothing else. So what are the texture cooridinates? I need the actual values. </p> <p>This is the drawing code:</p> <pre><code>// Counter-clockwise winding. gl.glFrontFace(GL10.GL_CCW); // Enable face culling. gl.glEnable(GL10.GL_CULL_FACE); // What faces to remove with the face culling. gl.glCullFace(GL10.GL_BACK); // Enabled the vertices buffer for writing and to be used during // rendering. gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); // Specifies the location and data format of an array of vertex // coordinates to use when rendering. gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVerticesBuffer); // Bind the texture according to the set texture filter gl.glBindTexture(GL10.GL_TEXTURE_2D, textures[filter]); gl.glEnable(GL10.GL_TEXTURE_2D); // Enable the texture state gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY); // Point to our buffers gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, mTextureBuffer); // Set flat color gl.glColor4f(red, green, blue, alpha); gl.glDrawElements(GL10.GL_TRIANGLES, mNumOfIndices, GL10.GL_UNSIGNED_SHORT, mIndicesBuffer); // ALL the DRAWING IS DONE NOW // Disable the vertices buffer. gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY); // Disable face culling. gl.glDisable(GL10.GL_CULL_FACE); </code></pre> <p>This is the index array:</p> <pre><code>short indices[] = { 0, 2, 1, 0, 3, 2, 1,2,6, 6,5,1, 4,5,6, 6,7,4, 2,3,6, 6,3,7, 0,7,3, 0,4,7, 0,1,5, 0,5,4 }; </code></pre> <p>I am not sure if index array is needed to find tex coordinates. Note that the cube vertex array I gave is the most efficient representation of a cube using the index array. The cube draws perfectly but not the textures. Only one side shows correct picture but other sides are messed up. I used the methods described in various online tutorials on textures but it does not work.</p>
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      1. POWhat are the texture coordinates for a cube in OpenGL?
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    1. COYou should probably post your drawing code too...
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    2. COHow many tex coordinates do we needed that is technically correct given above information? By tex coordinate I mean a 2d point like 1,0 in the tex coordinates array.
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