title: OpenGL Rotation
body: <p>I'm trying to do a simple rotation in OpenGL but must be missing the point.
  I'm not looking for a specific fix so much as a quick explanation or link that explains OpenGL rotation more generally.</p>
  
  <p>At the moment I have code like this:</p>
  
  <pre><code>glPushMatrix();
    glRotatef(90.0, 0.0, 1.0, 0.0);
    glBegin(GL_TRIANGLES);        
      glVertex3f( 1.0, 1.0, 0.0 );        
      glVertex3f( 3.0, 2.0, 0.0 );        
      glVertex3f( 3.0, 1.0, 0.0 );        
    glEnd();
  glPopMatrix();
  </code></pre>
  
  <p>But the result is not a triangle rotated 90 degrees.</p>
  
  <p><strong>Edit</strong>
  Hmm thanks to Mike Haboustak - it appeared my code was calling a SetCamera function that use glOrtho.  I'm too new to OpenGL to have any idea of what this meant but disabling this and rotating in the Z-axis produced the desired result. </p>