Hi clue-minute,

This is a clear question with complex-to-answer content, as rendering can be so much, but in short, typically not. I leave an option open here, just in case I miss something that is so far not communicated about your target.

When an object is rendered, it has influenced the scene, typically with reflections, shadows, and bouncing light. Eventually, it has refracted what is behind it, or mixed some parts from the scene based on depth of field or motion blur, and is perhaps overwritten (value-wise) by post effects of Bloom (or Flare, Glow, etc), etc.

The answer is no, if the object was not rendered with a specific mask and with a separate render that leaves the data behind it in the scene. So, if the object allows a separate rendering pass, then animating in After Effects, or even in Cinema 4D, is again possible. But any animation requires a new calculation, as any compositing takes the foreground and subtracts the pixels from the background. This requires at least a new writing of the file.

One more point, objects have a typically perspective and moving it without adjusting it to the new “view” will make it sit not well in the scene, given it is 3D.

The idea of faster rendering is typically that you get a fast preview, make your adjustments, and if needed, render in higher quality and resolution.

Perhaps I missed a point, and you have something else in mind, then please share a little bit more. Thank you!

I'm happy to look at your question more in detail if you share more.

Cheers