Export Alpha for animation

[Clero]

Hi, I'm trying to make an animation and I would like to export a no background scene to put it in after effects later, what is the way to save an alpha  in the animation of Cinema 4d + Corona?

[TomG]

Save to an image sequence like PNG which supports an alpha channel (as a note, you should always render animations to image sequences and composite to video later, never direct to a movie format - e.g. if the power goes outwith saving to movie, you have to start from the beginning, with saving to file sequence, you start from the next frame and carry on; and so on).

[Clero]

Save to an image sequence like PNG which supports an alpha channel (as a note, you should always render animations to image sequences and composite to video later, never direct to a movie format - e.g. if the power goes outwith saving to movie, you have to start from the beginning, with saving to file sequence, you start from the next frame and carry on; and so on).

Yes, i will render as image sequence, if i use multipass, like for alpha on some elements, does it work?
thanks for replying.

[TomG]

Not 100% sure what you mean - if the multipass element is being saved to PNG, it should already have an alpha (assuming that is set in the save settings); you can also add an Alpha multipass element and save that, to use as a mask should you not be saving to PNG or have any other reason to want that separately. I am not sure if you mean multipass elements, or if you mean elements in the scene like specific objects - for the latter, you should be able to use an ID pass to identify the object and mask it out in post etc.

You can post an example of the multipasses you are saving, what the scene looks like, what you want to achieve, etc. Hope this helps though!