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As well as having regular compositing tanks, that are also another type of tank called external compositing tanks. And these are useful to assign, to objects that you want to, then control in post production. Using null objects, or solids. So basically, information about the position and rotation and physical elements of the object, can be exported to After Effects, using this external compositing tag.
So basically, the way that it works is, imagine Our video wall, we want to setup a video wall in after effects and, we want to match the position and rotation of this element in cinema 4D. But we can select the wall in cinema 4D and you see this information there about the Position, scale and rotation of the wall, and then if I go to tag cinema 4D tags external compose thing.
Basically what it will do is output a null or a solid for me, so I am going to ask it to put out a solid and I am going to say make the solid Let's say, 1,000 pixels square, okay? And we'll leave it bright red, okay. That'll be our wall solid. That's all we need to do. And then we'll select the floor, and we'll do the same again. Tags > Cinema 4D Tags > External Compositing.
We'll create a solid, make it 1,000 pixels square. And we'll change this color to blue. Ok, so basically it's going to output solid for each of these elements in the after effects. And that means that I could use that solid to link video files to very easily and get the position right without having to mess around with my 3D. Positioning in After Effects.
And it will do the translation between, the CINEMA 4D coordinate system, and the After Effects coordinate system. Now there is one preference that was spoken about before that's very important. In your preferences, in order for these geometries to be exported >> You need to go into Preferences. And make sure you have Safe Polygons for millange. I'd also check that while you're in here as well. And basically, that allows you to export objects, or polygons, or geometry, and animation from Cinema 4D to After Effects.
So make sure you have that all set up before you save your project. Now with external composting /g tanks there's no need to add anything to the render settings. This is saved into the project file itself. And I'll show you how you can extract that, when we go to After Effects.
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