Transform a rotating cube into an animated mask?

[Fabeeo]

Hi there,

I’m wondering if and how can I transform a rotating-cube (or any 3D objects) into a black and white image that I could use as an animated mask. I tried with render to layer but with no success.

Thanks

[adrien.ravelli]

hi,
you can try the “render to texture” node. see my screenshot.
render to texture linked to alpha in material. (but you can link where you need an alpha
and for the cube material (who generate alpha texture uncheck “lit” => full white material .

regards

Adrien