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How do you render against a live action plate in Vray, and have shadows show up?

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  • How do you render against a live action plate in Vray, and have shadows show up?

    I have a set built out with proxy geometry, and I have the plate being projected onto the geometry through the camera. If I want to put a sphere down and render it and have the shadows show up on the ground, how do I do this without also having the proxy geo casting shadows all over the place? I tried using a material wrapper but I can't seem to get it working right....
    Last edited by X14Halo; 08-05-2013, 01:59 PM.
    Lead 3D Artist - A52/Elastic

    www.ianruhfass.com

  • #2
    Originally posted by X14Halo View Post
    I have a set built out with proxy geometry, and I have the plate being projected onto the geometry through the camera. If I want to put a sphere down and render it and have the shadows show up on the ground, how do I do this without also having the proxy geo casting shadows all over the place? I tried using a material wrapper but I can't seem to get it working right....
    1) Add a vrayMtlwrapper on the geometry
    2) Add an material override on the vrayMtlwrapper
    3) Enable environment override, and connect the projected image (projection node)
    4) Enable shadows on the vrayMtlwrapper
    Done

    Because vrayMtlwrapper show the environment, and because you do an override on the enviornment with your projection, you will see your projection with shadows.
    www.deex.info

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    • #3
      The shadows show up, but they have this really weird outline around them and the center of the shadow is not there (pic attached...)
      https://dl.dropboxusercontent.com/u/...13/shadow1.jpg

      Any idea what might be causing this? It is a pretty simple scene with just a directional and a dome light...
      I have the backplate on the camera image plane, i have just a white material on the ground going into a wrapper with matte surface checked on, alpha contribution to -1, shadows on, and affect alpha on. What am I missing?
      Last edited by X14Halo; 09-05-2013, 01:04 PM.
      Lead 3D Artist - A52/Elastic

      www.ianruhfass.com

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      • #4
        found out that the dome light was causing that weird outline effect. when i turned it off the shadow appears normal....why the hell would a dome light do that?
        Last edited by X14Halo; 09-05-2013, 05:23 PM.
        Lead 3D Artist - A52/Elastic

        www.ianruhfass.com

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        • #5
          It would be best to get us a scene to vraymaya@chaosgroup.com; our support guys will be able to help you.

          Best regards,
          Vlado
          I only act like I know everything, Rogers.

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