I am always happy to help! That was atrocious rust!
1. Actually, I think that the ground surface and the bottom of the image should be parallel. I always adjust the window so that one of the wheels is touching the bottom of the screen, and then rotate until both are.
2. Yes, I think that the relationship between the camera and the car is actually more important than how level the ground is, within reason.
Quote:
I'll take the truck to school today and look really strange with my level, checking the ground slope. Maybe I'll do it in the Environmental Studies parking lot, at least there I have a decent excuse.
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Just borrow a lab coat!