Thanks for the reply, TheChubu.
I did what you said- but nothing happened. The entire scene is rendered however no translation is being done.
I'm not sure if it makes a difference, but I noticed that you wrote:
But whatever I change that variable to- nothing happens.
Are you sure I don't have to somehow feed each variable through the shader? Or is that automatic?
My graphics card is an "ATI Mobility Radeon HD 2400 XT". My machine is a 2011 iMac but running Boot Camped WinXP.