Early on we thought a lot about coping with the player putting their head and hands through objects and the boundaries of the scenery [clipping], and we planned some pretty complicated systems to cope with this. But in the end we found it really wasn't an issue; that when strong immersion is maintained, obeying the rules of the world switches from a conscious choice to an instinct.
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Now we still have systems designed to cope with problematic player movement, but as a result of our findings the designs have become simpler and more focused on the worst case scenarios. So we have to have protections in place in case the player moves out of view of the camera, but say for guarding against them clipping through the edge of the car window as they lean through it, well if strongly immersed most players will simply duck their head exactly as they do in real life.
I do my best.
