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  • Background Plate Render

    Hey
    Very occasionally I need to montage a building on a background image. 99% of the time this is just a simple comp in photoshop as usual. Say however you wanted an exact background image to be reflected in the scene geometry (poolwater, shiny floors etc). If I put the backplate bitmap in the background as a screen environment with a GI override for the skylight - I get the result attached:
    Click image for larger version

Name:	teapot_Environ.jpg
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    The teapot has a simple white material with no refraction or opacity, and yet you can see the background through it in the shadow areas. Why is this? I can kind of understand how the reflection of the background bitmap on the blue plane would not work, as it is an arbitrary flat screen environment. Is there a way of achieving this without putting the backplate on a literal plane in the scene? BTW the blue water plane in this image has no refraction turned on either, and yet the background shows through it.

    Cheers
    Last edited by Bruce Hart; 24-07-2016, 07:54 PM. Reason: Additional Info

  • #2
    it think the solution someone had given me was to just turn on environment and reflection in vray environment and turn colors to black, try that
    Architectural and Product Visualization at MITVIZ
    http://www.mitviz.com/
    http://mitviz.blogspot.com/
    http://www.flickr.com/photos/shawnmitford/

    i7 5960@4 GHZm, 64 gigs Ram, Geforce gtx 970, Geforce RTX 2080 ti x2

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    • #3
      This is usually caused by the GI when environment map is added in screen-space.
      Change the mapping of the GI environment map to spherical and it should render fine.
      Svetlozar Draganov | Senior Manager 3D Support | contact us
      Chaos & Enscape & Cylindo are now one!

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      • #4
        but sometimes you want it in screen-space
        Architectural and Product Visualization at MITVIZ
        http://www.mitviz.com/
        http://mitviz.blogspot.com/
        http://www.flickr.com/photos/shawnmitford/

        i7 5960@4 GHZm, 64 gigs Ram, Geforce gtx 970, Geforce RTX 2080 ti x2

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        • #5
          GI environment with screen space will always project the image over the geometry.
          And under what circumstances is it necessary to add GI-environment in screen-space? You may add the background image in screen-space that's fine but adding the same image in GI-environment will cause those defects since GI requires other mappings types in order to generate more accurate result.
          Svetlozar Draganov | Senior Manager 3D Support | contact us
          Chaos & Enscape & Cylindo are now one!

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