How to get AE to remember where active 3D are placed for each shot composition?

I'll try to explain this in simple terms, as I'm a newbie...

We will say that we have live action camera images outdoors in an open space in the empty field. Two people are filmed talking to each other, standing in an interview next, sort of in a V angle. The camera that is the current active president and moves from one speaker to the other speaker. The empty field in the background are visible. What happens if we wanted to model import 3D of a tree and a 3D model of a bench Park and composite them in the background behind the first person and to import 3D model of a trash can and a 3D model of a traffic sign and composite those behind the second person.

Question1: Here, the question is, what is the industry standard workflow? The composer needs to follow the process of model track/match/import for every shot in the scene in order to add the assets concerned 3D EVERY TIME specific? Or is it possible to apply to memory/brain After Effects to be remembered and 'stick' of the asset with "tape" or "glue" on the surface of the soil of the field somehow, so they can simply be imported at the scene when the relevant shooting with the person concerned is indicated? i.e. Person1 has a background of a tree and a bench Park and Person2 has a trash can and a road sign. What is the standard common workflow in the industry for After Effects to 'remember' where to place the 3d elements? Is there a name for the process ' store where are placed the 3D assets "I am talking in Compositing language/lingo?

Question 2: what happens if two people have left the area 10 feet and then turned and walked toward the area of origin where they stood, but rather than stop there, they continued to foot - i.e. a continuous walk. How we can configure After Effects to remember and show the four 3D assets/models in the appropriate places as people walked passed between them where they have been placed at the origin?

If you want to add items to a scene and make them respond to the camera, you have only two options. The first is to run a track of the camera at the scene, establish a plan of mass and of origin and then insert your items. The second option is to use equipment of control of movement on your camera and then use these motion control data to control the position of a 3D camera in a 3D application. There is no direct way to import a motion control platform trace data directly in After Effects. I don't know anything about your production, but I doubt that you spend thousands of dollars a day for a motion control platform shoot your pictures. The only other option is to track camera your scene. Since no camera tracking data is included in any video file, you must perform the task of Camera Tracking, establish a plan of mass and inserting layers of reference for each shot.

AE camera has no lens distortion if you are shooting with a camera that has a lot of lens distortion is a good idea to try to remove as much of this distortion as you can before Camera Tracking. This also applies to the motion control machines. If the lens is pretty much a normal lens with a minimum distortion, you can get away with just followed the shooting.

Camera Tracker of AE done a very good job followed the shots that have a good amount of fixed geometry in the shot and this geometry has a lot of detail. You cannot track camera something like a Telephoto shot of a crowd of people walking on a sidewalk, because everything in the shot moves. There is no fixed geometry. You cannot walk on a beach and fire a shot of the waves coming and get a camera success follow unless you include enough of the Bank or other things that do not move to give the tracker some fixed geometry for follow up. You can't keep a shot of a wheat field a windy day with blue skies and a combine to harvest wheat, wheat all blowing in the wind, the combine is moving and there is no detail in the sky.

Now that we have that out of the way, with the right kind of shooting AE camera tracker is very good to generate a precise device that mimics the movement of the camera to film the original video. With a good track, you can insert 3D layers that are attacked to any plan (surface) of the geometry in the plan that you can use to generate a good target. Objects of reference will stay right where they should be. If you want another object of reference plan somewhere between the surfaces that you have identified in the shot, then you can easily add another layer 3D, hold down the SHIFT key and parent temporarily layer to one of the reference plans. This will send you the new 3D object on the same position as the reference layer. Use then other views of EI to position the layer between the layers of reference. IF YOU want to use the same time for several projects, you can duplicate the model in the project Panel and change the comp in doubles. Once you have added the camera and a few layers of reference, you can remove the effect camera Tracker. After the cameras and reference layers are added, there is no other use of the effect in your project.

If you want to add 3D elements to the scene when you have your camera and layers of reference correctly setup, you can export the project to C4D and it will generate a 3D with the camera project, the lights and the EI reference plans in the right place in C4D. You can then use the reference plans to place your 3D scene object.

Back in AE if you have obstacles in the scene, as your players walking between the 3D object or layers that you added, and then you use a copy of the layer of film or a solid and Rotoscoping you the layer to hide the parts of the 3D object or layer you need to fix them so the illusion is preserved.

If you need to generate a 3D model of the objects in the scene that you can do with 3rd party software like summaries. These 3D models can add it to your AE comp first, bringing the news of syntheses in a 3D application. In most cases, with the shots you describe, followed simple camera will do the job.

Here are two small videos showing Camera Tracking and masking, then Camera tracking for C4D Lite and adding and animating a 3D object. They are very short and not detailed, but you'll get the idea.

Sometimes, there is another option and is to do these things in 2D using Mocha or stabilize movements in AE, but that's another discussion. Good technique depends entirely on the photo that you use. All techniques require that all the follow-up work and to place layers of reference for each shot, you want to track.

Tags: After Effects

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