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Replacing the writing on a rotating licence plate – am I on the right lines?
The TV channel I work for is going to be showing the movie The Green Hornet, and I’m making the promos for it. I’d quite like to try tweaking the “rotating licence plate” shot, so that I can replace the word HORNET with our channel logo.
The shot in question is here:
I tried a few experiments in Motion 4 drawing a rectangle shape and rotating/repositioning it to match the licence plate, and despite moving the anchor point around it seemed like the rotation of the shape was never going to follow the rotation of the licence plate.
I started thinking that the way to do this would be to recreate the rotating licence plates in 3D space, but square on to the camera, *then* move the camera to try and match the viewpoint of the original shot, and finally use a mask to put my plates over the top of the ones from the movie.
Before I get too deep into possible frustration, do you reckon I’m on the right lines, or do I need to rethink?
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37 Replies
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Add a camera to your scene.
Keep your live action background plate as a 2D group.
Add a Grid and make the BG Opacity zero.
Adjust your camera so the grid lines up with the perspective lines of your car number plate.
At that point when you add in your new number plate – also in a 3D group it will be easy to line it up pretty much perfectly.
It stop position has an X rotation of about 14-15 degrees so you’ll need to work with that.
hawaiki.co
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Brilliant – thanks!
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Good luck with it – should look pretty cool when you’re done.
hawaiki.co
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Figured out Simon’s trick. Thank you!
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I just meant add a Grid Generator as a 3D layer which makes it easy to then line up the camera – using the interactive controls.
Happy to do a quick demo video if it’s still not clear.
Superimposing a grid is the classic way of solving this problem because it becomes really easy to judge the correct camera position from the perspective of the underlying scene.
hawaiki.co
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Like your picture Simon I can get the grid to align with the license plate either horizontally or vertically but not both at the same time. Must be the a secret sauce in there somewhere! 🙂
The workflow is genius in its simplicity and I would like to practice it for the day I will need it.
Thanks,
Don Smith
NewsVideo.com
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Hhhmm.. it would seem that I align the grid horizontally.. put in my graphic and then rotate the graphic to satisfy the vertical edges.
NewsVideo.com
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Got it. Thank you.
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Oh shucks – I’ve just done you a tutorial video which I’ll upload in a moment.
There’s a useful tip for adjusting the camera’s angle of view which might help you.
hawaiki.co
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Here’s a quick demo video on how to do this:
Hope that helps.
hawaiki.co
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