Alpha values as 0/-1 (minus one)?

[jms.lwly]

A feature I previously used in V-Ray (yes, another one of those type of questions) was overriding an objects contribution to the alpha map to zero or minus one - or occasionally something in between.

This was normally achieved by right-clicking and accessing some V-Ray properties - obviously not applicable in Corona!

Has Corona got a similarly automated way to do this? If not I can render a MatID element or similar and mask objects out of my alphas that way (or manually in Photoshop) - but if there’s any other way it’d be great!

[mferster]

From what I understand, you want to override a material's alpha to be either black or white regardless of it's alpha value? If that is the case you can do this in the materials advanced options rollout, and change the alpha mode from default to black or white.

[maru]

Exactly, if that's what you need, there is an "alpha mode" rollout under "advanced options" in the Corona mtl.

[jms.lwly]

This is exactly what I was looking for...

...not sure how I missed it! Thanks both!