<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>

Ensure that you're modifying the modelview matrix by putting the following before the glRotatef call:
```
```
glMatrixMode(GL_MODELVIEW);
```
```
Otherwise, you may be modifying either the projection or a texture matrix instead.