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Thread: Compositing buffer export + selected objects = no antialiasing?

  1. #1
    Registered User
    Join Date
    Oct 2012

    Compositing buffer export + selected objects = no antialiasing?


    I'm trying to setup some extra buffers for specific objects in my scene.

    I'm adding several "Compositing Buffer Exports" image filters, each with a different name and different object selections. Basically I'm trying to make masks for these objects.

    I noticed that the "diffuse" buffer is creating a white, alpha-like image for the selected objects. Strange naming, but hey, that's what I need so OK, especially since there is no "alpha" buffer in the filter options.

    Now for the problem:

    The filters work... but the resulting images are antialiased only against the background!
    If a separated object is overlapping another objects in the scene (which is not in the render pass, because of the selection) THE RESULT IS A JAGGED EDGE.
    I'm not talking about buffers that are not supposed to be aliased by design like depth or normals... this is a buffer that is PARTLY ANTIALIASED . Now this must be useful for something... (any ideas?) but not what I need.

    Please tell me if this is the expected behavior? and if so, what other buffer/ method can I use to produce simple masks? Without plugins or nodes - yes I know about Janus and Dpont etc. but my bosses insist on using native LW only - for the sake of simplicity.

  2. #2
    Super Member dwburman's Avatar
    Join Date
    Feb 2003
    Washington State, USA
    I'll sometimes use the matte settings for objects if I need to separate them. I'm not sure that's what you're asking about, though. Hmmm, I wonder if you'll still get the jaggies if you set the hidden objects alpha to 'constant black' in the scene editor.
    [mr] Dana W. Burman |
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