[seghier]

Hello
i created custom alpha for the orange material with sl : 22 and set render sl to : 16
but the render finished at sl 16 ; than i increased it to 19

[ababak]

Have you checked the result of custom alpha? I am sure it is black in your case as the juice is completely covered with dielectric.

[seghier]

so in this case the custom alpha don't work

[Mihai]

Try an object ID as alpha instead.

[seghier]

object ID channel ?
the custom alpha was black and th object ID created for glass only

[Mihai]

I ment:

instead of a MatID, try rendering an object ID for the SSS and see if that alpha is visible.

[seghier]

Mat ID and object ID rendered only for the glass

[Mihai]

Yes, this is a case where refractions taken into account for the MatID and ObjID would be helpful. I guess manually specifying a render area instead of using alphas in this case is the only way. Or just use the matID or objID of the glass itself.

[seghier]

matID or objID of the glass rendered as opaque object ; like there is no liquid inside it
i will create a mask for the orange

[Mihai]

Why bother? The glass alpha itself is a close enough shape to render more the SSS, even if it does also render a little bit more area than you need.