alpha layer node

[pleiada]

the layer node is replaced now by layer rgba, layer shader and layer float. i do see the way to input alpha channel now. Any suggestion?? i am looking for the way to make alpha with ambient occlusion

i found this article https://docs.arnoldrenderer.com/display/A5AFMUG/Layer+RGBA but still don't understand how to connect two standart surfaces to it. the node is just greyed out and don't allow me to connect shaders

[madsd]

Hi
Im using 3ds max here, but you should be able to recreate it in Cinema since we use same nodes.

If I understand you correctly, you want to use AO to control some objects alpha.

You can add up 2 AO shaders tracing front and back normals to catch full cage.
Used a CC node to add more contrast, but you can leave it out.

The Opacity slot would be your main target here, adding up the 2 different AO effects. That returns some object with AO as alpha here atleast.

I inverted the Application so the AO area returns MESH and non affected areas is invisible.