Le 27/01/2021 à 19:46, kurtz le pirate a écrit :
> Hi,
> 
> 
> I try to have "transparent" background for one image. In accordance with
> the documentation, i check the "Add Alpha Channel" in output options.
> The file type is png. I had already used this option with the previous
> versions without any problem. It even seems to me that in the image
> window, a button could raise the transparency (the grey/white
> checkerboard).
> 
> This feature seems no longer exist.
> Error on my part or forgotten option ?

The preview display does not have the checkerboard anymore, and does not
display the alpha channel. But the generated png file should be ok.

From my (old) memory, for png with alpha, +UA on the command line AND
something about "background" in the scene (NO background at all).

Also, that's where sky_sphere might be a problem : it's a background too.

Ok, you will get alpha with background/sky_sphere as long as you have
some transmit or filter part in the colour of background/sky_sphere.
And +UA.

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