VBO drawing by baldurk

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glEnableClientState(GL_VERTEX_ARRAY);     glEnableClientState(GL_NORMAL_ARRAY);     if(!vboenabled)     {         vboenabled = true;         glGenBuffers(1, &vbo);         glBindBuffer(GL_ARRAY_BUFFER, vbo);         // NumTriangles triangles, each with 3 normals and 3 vertices, each with 3 components         glBufferData(GL_ARRAY_BUFFER,              NumTriangles * 3 * 3 * 2 * sizeof(float),              NULL, GL_STATIC_DRAW);         float *verts = new float[NumTriangles * 3 * 3 * sizeof(float)];         float *norms = new float[NumTriangles * 3 * 3 * sizeof(float)];         for(int i=0; i < NumTriangles; i++)         {         int ref = i*3*3;         verts[ref+0] = Vertices[Triangles[i].vertices[0]].pos.x;         verts[ref+1] = Vertices[Triangles[i].vertices[0]].pos.y;         verts[ref+2] = Vertices[Triangles[i].vertices[0]].pos.z;         verts[ref+3] = Vertices[Triangles[i].vertices[1]].pos.x;         verts[ref+4] = Vertices[Triangles[i].vertices[1]].pos.y;         verts[ref+5] = Vertices[Triangles[i].vertices[1]].pos.z;         verts[ref+6] = Vertices[Triangles[i].vertices[2]].pos.x;         verts[ref+7] = Vertices[Triangles[i].vertices[2]].pos.y;         verts[ref+8] = Vertices[Triangles[i].vertices[2]].pos.z;         norms[ref+0] = Vertices[Triangles[i].vertices[0]].normal.x;         norms[ref+1] = Vertices[Triangles[i].vertices[0]].normal.y;         norms[ref+2] = Vertices[Triangles[i].vertices[0]].normal.z;         norms[ref+3] = Vertices[Triangles[i].vertices[1]].normal.x;         norms[ref+4] = Vertices[Triangles[i].vertices[1]].normal.y;         norms[ref+5] = Vertices[Triangles[i].vertices[1]].normal.z;         norms[ref+6] = Vertices[Triangles[i].vertices[2]].normal.x;         norms[ref+7] = Vertices[Triangles[i].vertices[2]].normal.y;         norms[ref+8] = Vertices[Triangles[i].vertices[2]].normal.z;         }         glBufferSubData(GL_ARRAY_BUFFER,                 0,                 NumTriangles * 3 * 3 * sizeof(float),                 verts);         glBufferSubData(GL_ARRAY_BUFFER,                 NumTriangles * 3 * 3 * sizeof(float),                 NumTriangles * 3 * 3 * sizeof(float),                 norms);         delete[] verts;         delete[] norms;         glVertexPointer(3, GL_FLOAT, 0, (void*)0);         glNormalPointer(GL_FLOAT, 0, (void*)(NumTriangles * 3 * 3 * sizeof(float)));     }     glDrawArrays(GL_TRIANGLES, 0, NumTriangles*3);