Alpha Matte Problem

[pax]

Hi everyone,

 

I have a problem with alpha masks, for instance:

I want to render a one object in front of another (in this example just a sphere in front of a cube). However, I want to render them separately, because one object (in this case the sphere) is already finished, while the other (the cube) is still a work in progress, so I want to render objects as they are ready, instead of waiting for everything to be done and rendering everything at once. Once the cube is ready I want to render it and use my Sphere as a matte object in order to get my alpha mask.

In Nuke I then lay the cube over the sphere.

Now my problem is that my merged alpha is not solid (see attached images). 

Any suggestions on how to fix it?

Thanks in advance.

 

Cheers,

 

 

 

alphaProblem.hip

 

[mestela]

try setting the merge mode to 'disjoint over'.

[pax]

Worked like a charm!

Thank you so much for the quick reply