Using Object Buffers in Cinema 4D makes it easy to create masks and track mattes for individual objects. Haven't heard of object buffers? What you can do is use the Compositing Tag to assign an object buffer to individual 3D objects, then when you render out a multi-pass render, you'll also render out a black and white version of the frame, with the selected object in white.
What's the point of that? Well, you can use this as a selection in Photoshop or as a Track Matte in After Effects. This way, you can add adjustments to individual elements of an animation wihtout needing to rotoscope or mask out the object. This can also be a huge time saver if you need to make an adjustment after you've already rendered the project.
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