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I am not sure what you mean by using tracking. I am projecting the scene using a back projecting screen (2m by 1.5) which is 43.5cm above the ground. So, when people's eye-height is set to 1.05m that does not correspond to the centre of the display, but a bit lower than that, so the horizon is wrong.
I am recording eye-movements as well as the position within the scene. Is that any help?
Thanks!
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