Le 04/03/2016 21:02, Satadorus a écrit :
> QUESTION:
> 
> - Am I correct to assume that Povray only makes the rays that DO NOT hit an
> object transparent?

Well, transparent is area that was background only. And "half-transparent" the border
between object and background if you use antialiasing (yes, you do with AA 0.3)

> 
> - If I specify a greenish background and that colour also appears in my
> rendering, is ONLY the background transparent? Or also part of my rendering.

Colour is irrelevant, it's the background, as a concept, that is important.

> 
> - How can I use a series of Povray images to create an animation?
> - - Years ago I used VideoMach. Are there better tools?
> - - Are there tools to merge my animation with another video?

Depend on your platform.

I would go for ffmpeg and kdenlive, but I'm on linux (and tuning ffmpeg can be
painful).

> 
> What I would like is a way to show my animation 'in front' of another video.
> Like Blue or Green screen technique used for film and TV.
> 

You need a video editor, with multiple tracks... kdenlive :-)

If you have all the frames from both video, you can also do it by hand/script with
imagemagick, then encode the final result.

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