Question about video frame rate for miniatures - gravity vs linear movement.

Joined
Sep 17, 2006
Messages
12,773
Location
Ashburton , New Zealand
My problem: When filming miniatures we have to shoot at the inverse square of the scale difference. A 1/16th scale needs to be filmed at 1/4 speed to compensate for gravity. If the full size model fell 16m the model would have to fall 1m but because of gravity being per second squared the smaller object won't achieve the same speed and time needs to be slowed down 4X to make it look like it is bigger. Hence why it is the inverse square - to compensate for gravity.
BUT: Linear speed remains the same - 16m/s for the full size object would be 1m/s for the model - but since we are filming it 4X slower it now has to move 4X faster to achieve that look. So now it has to move at 4 m/s to look like it is doing 1 m/s.
Now the conundrum: What happens when my model car launches over a cliff? Surely it will not look natural because it will most likely launch 4X further than it would if it were going at 1m/s. Gravity will look right all the time but that instant where it launches off that cliff it's like we are going in slow motion because it will launch that much further.

 
Joined
Sep 17, 2006
Messages
12,773
Location
Ashburton , New Zealand
Thanks for that. I understand now the issue is that the vertical distance to fall is less.
I suspect there is no good solution to your problem other than CGI.
Aaaaargh! The "Photoshop" of video - I want to get it as right "in camera" as possible - I suppose that will involve two shoots at different speeds.
 

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