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POTrouble with OpenGL Vertex Array Sphere C
 

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  1. POTrouble with OpenGL Vertex Array Sphere C
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    <p>Heres a pic of the problem:</p> <p><img src="https://i.stack.imgur.com/Di13k.png" alt="enter image description here"></p> <p>And here is the wireframe:</p> <p><img src="https://i.stack.imgur.com/siS8j.png" alt="wireframe"></p> <p>As you can see from the pictures above, I have some sort of weird graphical issue and am not sure how to fix, I think somethings wrong with the code although noone else has had trouble with the code.</p> <p>Code:</p> <pre><code> unsigned int rings = 12, sectors = 24; float const R = 1./(float)(rings-1); float const S = 1./(float)(sectors-1); int r, s; vertices.resize(rings * sectors * 3); normals.resize(rings * sectors * 3); texcoords.resize(rings * sectors * 2); std::vector&lt;GLfloat&gt;::iterator v = vertices.begin(); std::vector&lt;GLfloat&gt;::iterator n = normals.begin(); std::vector&lt;GLfloat&gt;::iterator t = texcoords.begin(); for(r = 0; r &lt; rings; r++) for(s = 0; s &lt; sectors; s++) { float const y = sin( -M_PI_2 + M_PI * r * R ); float const x = cos(2*M_PI * s * S) * sin( M_PI * r * R ); float const z = sin(2*M_PI * s * S) * sin( M_PI * r * R ); *t++ = s*S; *t++ = r*R; *v++ = x * getR(); *v++ = y * getR(); *v++ = z * getR(); *n++ = x; *n++ = y; *n++ = z; } indices.resize(rings * sectors * 4); std:vector&lt;GLushort&gt;::iterator i = indices.begin(); for(r = 0; r &lt; rings; r++) for(s = 0; s &lt; sectors; s++) { *i++ = r * sectors + s; *i++ = r * sectors + (s+1); *i++ = (r+1) * sectors + (s+1); *i++ = (r+1) * sectors + s; } glEnableClientState(GL_VERTEX_ARRAY); glEnableClientState(GL_NORMAL_ARRAY); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glVertexPointer(3, GL_FLOAT, 0, vertices.data()); glNormalPointer(GL_FLOAT, 0, normals.data()); glTexCoordPointer(2, GL_FLOAT, 0, texcoords.data()); glDrawElements(GL_QUADS, indices.size(), GL_UNSIGNED_SHORT, indices.data()); </code></pre> <p>Code taken from (<a href="https://stackoverflow.com/questions/5988686/how-do-i-create-a-3d-sphere-in-opengl-using-visual-c/5989676#5989676">Creating a 3D sphere in Opengl using Visual C++</a>)</p>
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    1. COIf I had to guess, perhaps you are not filling in one of your vertex points so it remanins with uninitialized data. Rotate the camera around and see how many points are bad to confirm this.
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      1. USMichael Dorgan
    2. COOther people haven't had problems with them so not sure what the problem is :S Heres how it looks in wireframe mode http://img687.imageshack.us/img687/5849/globe2.png
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    3. COIt looks like either off-by-one error or a driver bug. Are you sure your `vector`s are empty?
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      1. USBartek Banachewicz
 

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