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    Twilight - Invisible but cast shadow?

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    • ShantaS Offline
      Shanta
      last edited by

      Does anyone know of a way to render a material so that it is absolutely clear but still casts a shadow? I am trying to do a light study of a whole house in a dollhouse view (looking down with roof and ceilings removed) so that I can see the light only from windows and doors. But, of course, all the light pours in from the missing roof. I need someway to block the light that the roof would, but not obscure my view of the interior. I'd like to use high quality renderers.

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      • BoxB Offline
        Box
        last edited by

        How about using a section plane.

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        • TIGT Offline
          TIG Moderator
          last edited by

          Use this.TransparentDummy.skm

          TIG

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          • ShantaS Offline
            Shanta
            last edited by

            @box said:

            How about using a section plane.

            Nope, light enters through the section.

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            • ShantaS Offline
              Shanta
              last edited by

              @tig said:

              Use this.[attachment=0:3giecx2n]<!-- ia0 -->TransparentDummy.skm<!-- ia0 -->[/attachment:3giecx2n]

              This works great in SU, but Twilight does not render the shadow. Thanks, though.

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              • TIGT Offline
                TIG Moderator
                last edited by

                Have you tried adjusting the equivalent Twilight Material ?

                TIG

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                • bazB Offline
                  baz
                  last edited by

                  Possibly render with the 'Sun' off. And use emitters in the doors and windows. (In Twilight anyway).

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                  • TIGT Offline
                    TIG Moderator
                    last edited by

                    The way the material works in SketchUp is that its texture is a 100% transparent PNG texture, but the material is set to be 100% opaque: that way you can see through it but it casts a shadow.
                    The equivalent Twilight material that gets substituted needs the same setup...

                    TIG

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                    • ShantaS Offline
                      Shanta
                      last edited by

                      I guess I'm still missing something. I've tried with the alpha at 0% and 100%, neither produces a shadow in Twilight. The template is "flat", should I start with something else? Advanced pane has Casts Shadows and Blended Clip turned on. Any help appreciated.
                      Screen Shot 2019-06-14 at 10.26.18 AM.png

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                      • tuna1957T Offline
                        tuna1957
                        last edited by

                        Follow the link... it might be of help. Really suggest posting your question on the Twilight Forum. If it's doable Chris or Fletch should know.https://www.twilightrender.com/phpBB3/viewtopic.php?f=12&t=3107#p24290

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