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Thread: Compositing-ready shadows

  1. #1
    Axes grinder- Dongle #99
    Join Date
    Jul 2003
    Location
    Seattle
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    14,726

    Question Compositing-ready shadows

    dammit, I used to know this....

    How does one prep an animation so that a white, 'void' type background can be dropped out and replaced, BUT the shadows from the objects will still be respected?

    I can turn off alpha for the backdrop object but I'm not sure what happens to the shadows.... a faint memory of "preluminescent multiply blend mode" is ringing, but I can't quite get it.
    They only call it 'class warfare' when we fight back.
    Praise to Buddha! #resist
    Chard's Credo-"Documentation is PART of the Interface"
    Film the cops. Always FILM THE COPS. Use this app.

  2. #2
    Goes bump in the night RebelHill's Avatar
    Join Date
    Nov 2003
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    jersey
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    5,763
    The ol way was to set the groud objects alpha to shadow density, the alpha then contains the shadow info.

    But now... just use shadow catcher material node.
    LSR Surface and Rendering Tuts.
    RHiggit Rigging and Animation Tools
    RHA Animation Tutorials
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    RHN Nodal Tutorials
    YT Vids Tuts for all

  3. #3
    Axes grinder- Dongle #99
    Join Date
    Jul 2003
    Location
    Seattle
    Posts
    14,726
    Thanks RH: Time to dl the dox to this (crappy little) laptop I take to the coffee shop.

    GAFFER used to have a ....thing that would allow perfect compositing of shadows on backgrounds.
    They only call it 'class warfare' when we fight back.
    Praise to Buddha! #resist
    Chard's Credo-"Documentation is PART of the Interface"
    Film the cops. Always FILM THE COPS. Use this app.

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