+1  A: 

If you are scaling by the same amount in the x and y directions, then your projection is causing the distortion.

Just a hunch, but maybe try swapping the 320 and 480 in your Ortho projection. (In case the X and Y on the iPhone is swapped)

geofftnz  2009-08-13 03:24:42
Wow! That was the answer, thank you very much. Everything works now!
 2009-08-13 04:48:04
Don't Forget to accept his post AJ.
Goz  2009-08-13 07:54:50
I would, but I can't see how to do that at the moment. Maybe there is a minimum time limit or I can't because I'm not registered. I will check back later anyway.
 2009-08-13 23:29:02

related questions

Developing a NavigationBar Based application including one Open GL View : How?
Want to display a 3D model on the iPhone: how to get started?
OpenGl ES scrollable ListBox clipping problem
What is the fastest way to draw single pixels directly to the screen in an iPhone application?
Understanding the memory consumption on iPhone
porting iPhone openGLES app to OSX?
3D effects in a 2D game using OpenGL
Any one know of an OpenGL ES example of an interactive globe/earth for the iPhone.
How do I grab an image form my EAGLLayer ?
opengl: how to avoid texture scaling
Custom view transition in OpenGL ES
Re-displaying EAGLView in simple iPhone game
OpenGL: How to implement an "eraser" tool?
What's "in" and "out" of OpenGL-ES? (Porting from OpenGL)
Can I use indexed primitives when using vertex buffer objects in OpenGL ES 1.x?
Why does calling glMatrixMode(GL_PROJECTION) give me EXC_BAD_ACCESS in an iPhone app?
Change texture opacity in OpenGL
Large scrolling background in OpenGL ES
Why does my OpenGL ES iPhone game flicker when I first turn on the phone?
Is there a way to import a 3D model into Android?
Dithering gouraud-shaded vertex-colored polygons to remove banding
How to Implement Ocean Surface Effect Using OpenGL ES 1.1?
How do I create a zoom effect in OpenGLES on the iPhone?
How well does the Android Phone Emulator reflect the performance?
Learning OpenGL ES 1.x