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Old 07-04-2003, 09:53 PM   #1
Sardo Numspa
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Default How do you get soft Shadows when Raytracing?

This is a scene I have been working on. Notice the hard shadows underneath the cars. How do I soften these up? They are ray traced...not Dmaps. Any other suggestions welcomed and how to improve this scene and look. Thanks.

BTW...I would use Dmaps but the shadows are hosed. I have adjusted the Res to match the render output i.e. 640 x 480. So I raytrace.
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Old 07-04-2003, 10:28 PM   #2
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You want to look at both the light radius and shadow rays attributes. In a nutshell, adjusting the light radius will give you your soft shadows. The Shadow rays attribute controls the sampling of the shadows (kind of like the dmap filter).
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Old 07-04-2003, 10:48 PM   #3
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Btw, here's a quick example I just did for you with a sphere, ground plane (a cube actually) and a spotlight. I left the raytracing defaults in render globals and in the spotlight's attributes, it's setup like this:

no decay
cone angle 40
penumbra 10
dropoff: 0


raytraced shadows on:

Light radius: 2.009
shadow rays: 10
depth limit: 1

You should experiment with lower values....increasing radius or rays will slow your rendering, even for simple scene such as the one I did.
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Old 07-04-2003, 10:49 PM   #4
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Ewps, forgot the attachment (hit the wrong button). Here it is.
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Old 08-04-2003, 12:00 AM   #5
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Thank you for the advice and example. However, I am using 4 directional lights so what are the parameters for soft shadows with them. Thanks.
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Old 08-04-2003, 12:41 AM   #6
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Directional lights have the same raytrace shadow attributes as the spotlights. Adjust the same settings I mentioned.
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Old 08-04-2003, 12:47 AM   #7
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Here's another example using the same settings as before except this has a directional light rather than a spotlight.
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Old 10-04-2003, 01:57 AM   #8
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Thanks man. I got it to work. I have a new problem now so check for my next posting.

Cheers
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Old 10-04-2003, 06:57 AM   #9
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Hey, i really like your render there, thats a great scene... i would definately tone down the lighting a bit though, it makes it look a bit fake because it shows ALL the details with that much light, the less light, can sometimes be the best thing . Really nice though, post your fixed image when its done .
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