Twilight - Invisible but cast shadow?
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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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How about using a section plane.
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Use this.TransparentDummy.skm
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@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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Have you tried adjusting the equivalent Twilight Material ?
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Possibly render with the 'Sun' off. And use emitters in the doors and windows. (In Twilight anyway).
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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... -
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.

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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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