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  1. PO
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    copied!<p>The problem with your syntax is by saying targetVertices[iii] you re referring to the iiith index of the array, not the entire column. 2D arrays are stored as 1D arrays, but provide [][] for simple access. You can refer to them as single or dual dimensional.</p> <p>Here is a more reusable way to approach this.</p> <pre><code>void addVertex(std::vector&lt;GLfloat&gt; &amp;data, GLfloat x, GLfloat y, GLfloat z) { data.push_back(x); data.push_back(y); data.push_back(z); } </code></pre> <hr> <pre><code>void addCube(std::vector&lt;GLfloat&gt; &amp;data, GLfloat x, GLfloat y, GLfloat z) { addVertex(data, x-1, y-1, z-1); addVertex(data, x-1, y-1, z+1); addVertex(data, x-1, y+1, z+1); addVertex(data, x-1, y+1, z-1); addVertex(data, x+1, y-1, z-1); addVertex(data, x+1, y-1, z+1); addVertex(data, x+1, y+1, z+1); addVertex(data, x+1, y+1, z-1); addVertex(data, x-1, y-1, z-1); addVertex(data, x-1, y-1, z+1); addVertex(data, x+1, y-1, z+1); addVertex(data, x+1, y-1, z-1); addVertex(data, x-1, y+1, z-1); addVertex(data, x-1, y+1, z+1); addVertex(data, x+1, y+1, z+1); addVertex(data, x+1, y+1, z-1); addVertex(data, x-1, y-1, z-1); addVertex(data, x-1, y+1, z-1); addVertex(data, x+1, y+1, z-1); addVertex(data, x+1, y-1, z-1); addVertex(data, x-1, y-1, z+1); addVertex(data, x-1, y+1, z+1); addVertex(data, x+1, y+1, z+1); addVertex(data, x+1, y-1, z+1); } </code></pre> <hr> <pre><code>void makeCubes(std::vector&lt;GLfloat&gt; &amp;data) { float targetX[10], targetY[10], targetZ[10]; data.clear(); data.reserve(720); //...initialize the above arrays... for (int i=0; i&lt;10; i++) { std::vector&lt;GLfloat&gt; newData; addCube(newData, targetX[i], targetY[i], targetZ[i]); data.insert(data.begin(), newData.begin(), newData.end()); } } </code></pre> <hr> <p>You can easily convert this to a C-array by taking a reference to the first element:</p> <pre><code>std::vector&lt;GLfloat&gt; data; makeCubes(data); GLfloat *cArray = &amp;data[0]; </code></pre> <p>A call to glBufferData could be made like this:</p> <pre><code>glBufferData(GL_ARRAY_BUFFER, data.size()*sizeof(GLfloat), &amp;data[0], GL_STREAM_DRAW); </code></pre>
 

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