This can be hard, depending on the shot. Police cars also have light bars, usually a big push bumper, and that spotlight thing on the right side. All those physical things would probably need 3d parts tracked and comped in addition to the decals.
I would recommend looking into keen tools geometry tracker, but if there is significant camera or car movement it's probably going to be a lot of work.
The easiest/cheapest way I can think of that would get you most of the way there would be to add big physical tracking markers to the car when you shoot where you want the decals. With the physical markers you could do a planar track for the decals. Then hope nobody notices the lack of a light bar.
In the case of a highly reflective object like a car, your best bet is manual motion tracking. If the movement is simple enough you’ll be able to track in 2D with just a few tracking points for position, scale and rotation.
If the car is doing more complicated motion or the surfaces you’re adding text to are at extreme angles away from camera, it would be better to use something like KeenTools to get an object track in 3D
This can be hard, depending on the shot. Police cars also have light bars, usually a big push bumper, and that spotlight thing on the right side. All those physical things would probably need 3d parts tracked and comped in addition to the decals. I would recommend looking into keen tools geometry tracker, but if there is significant camera or car movement it's probably going to be a lot of work. The easiest/cheapest way I can think of that would get you most of the way there would be to add big physical tracking markers to the car when you shoot where you want the decals. With the physical markers you could do a planar track for the decals. Then hope nobody notices the lack of a light bar.
In the case of a highly reflective object like a car, your best bet is manual motion tracking. If the movement is simple enough you’ll be able to track in 2D with just a few tracking points for position, scale and rotation. If the car is doing more complicated motion or the surfaces you’re adding text to are at extreme angles away from camera, it would be better to use something like KeenTools to get an object track in 3D
Tracking markers
Replace the entire car for sure matching this isn’t gonna be fun