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Old 04-28-2002, 03:46 PM   #1   Add To Ignore List  
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Default Can Transparent Portals cast shadows?

I was wondering if there is any way for a transparent portal to cast a shadow. Example: Let's say you have a transparent grate textures which you want to cast the shawdow of the bars in the grate on the opposite wall. Is there any way to do this? The Poly is only a 2d object, so I doubt this would be possible, but croteam has some surprises worked into the engine, and I'm hopeing. I thought that by checking the "after shadow" check box in poly mode would do it, but I found out that that just renders the textures after the lightmap making it immune to shadowing.

Is what I'm proposing even possible?
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Old 04-28-2002, 05:03 PM   #2   Add To Ignore List  
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MailMan from HitSquad found a great work-around for this.

For you case, apply the bars to Texture 2 to where the shadows would be (probably on the floor of an air vent.)

Toy around with the Blend options for Texture 2 and find one that applies it ala shadow (Multiply may be it.)

Anyhow, mess around and good luck.
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Old 04-28-2002, 06:35 PM   #3   Add To Ignore List  
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Thats a good work around, but with directional light, you can't skew the texture so it looks natural
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Old 04-28-2002, 06:47 PM   #4   Add To Ignore List  
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How about making the 2D brush as a 2D model instead, as Im quite sure that models cast shadows through the transparent parts of the texture on them.
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Old 04-28-2002, 10:31 PM   #5   Add To Ignore List  
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now that's a pretty good Idea. If I ever get around to learning the modeler (I've always had U/V coordinate problems) then I might try that. Thanks
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Old 04-29-2002, 09:52 AM   #6   Add To Ignore List  
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It is possible. Try marking the bars polygon as Illumination - Vitraji 1 (or whatever, found on the Shadow tab), and then applying the same setting to a light's Illumination property. Don't know if that is possible at all with directional lights, as illuminating lights don't cast any light unless there is a polygon with the same Illumination value in the way.
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