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Thread: complete cast shadows as a render buffer?

  1. #1

    complete cast shadows as a render buffer?

    I do a lot of product renders for print and render out the shadow buffer to create a separate shadow layer in photoshop when supplying final layered files. If I want the full shadow without the product's silhouette cut out of it, I can set up an extra render with the product object "unseen by camera."

    I was messing around today and trying to come up with a way to set this up as a custom render buffer on the "floor" material, so that extra renders wouldn't be necessary. I have not figured it out yet. Maybe there's another trick I'm not aware of. Anyone have any ideas?

    Thanks.

  2. #2
    Curmudgeon in Training Ma3rk's Avatar
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    "Never be a cat in a cartoon. Never." Chief Wiggum

  3. #3
    No. I want the complete shadow behind the object. Imagine rendering the shadow pass with the car set to unseen by camera. How do I render that as a render buffer, without setting up a second render?

    Quote Originally Posted by Ma3rk View Post

  4. #4
    obfuscated SDK hacker Lightwolf's Avatar
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    Quote Originally Posted by cwarden View Post
    No. I want the complete shadow behind the object. Imagine rendering the shadow pass with the car set to unseen by camera. How do I render that as a render buffer, without setting up a second render?
    You don't. Those shadows don't actually exist in the renderer - until the area that receives the shadow is actually visible.

    Cheers,
    Mike

  5. #5
    Curmudgeon in Training Ma3rk's Avatar
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    And Mike would certainly know, but perhaps there's some combo of Surface or Object ID buffers you can massage to get that.
    "Never be a cat in a cartoon. Never." Chief Wiggum

  6. #6
    My solution was just to have a second frame where the product is dissolved 100% and a product copy set to unseen by camera casts a full shadow. Since unseen by camera is not keyframe-able, this seems like the only way.
    I was sure there would have been a way with custom buffers though.

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