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Old 10-02-2012, 07:32 AM   #1
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MR Shadow Issue

Hi
I have a geometry sample (in the file linked below) that is representative of a large amount of geometry in my file that is rendering unwanted shadows in MR.
I suspect that the geometry is to thin to render correctly. Almost coplanar??
I have tried back face cull.
I don't really want to have to delete faces as this could take a lot of time.
All normals seem to be correct.

Link to 3dsMax2012 File
 
Old 10-02-2012, 07:44 AM   #2
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just deleted the back faces and it does solve but dont want to have to run this solution over the whole object (400k tris)
 
Old 10-02-2012, 03:09 PM   #3
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I believe the "problem" (if I understand the issue correctly) has nothing to do with your geometry. It's your scene.
1. There's no bounced light so the underside of the object is black. Fix: Add a skylight.
2. You're using a shadow mapped light source with a projection map. The shadow map settings are low quality and add the projection map too that and it gets messy. Fix: Switch to raytraced shadows.
3. Apply a material to the object.

Attached adjusted file.
Attached Files
File Type: zip shadow query_adj.zip (89.1 KB, 2 views)
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Old 10-03-2012, 01:53 AM   #4
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HI Jeff
Thanks for that.
I'll take a look at your file.
Its not the underside of the object i'm concerned with - its the top. Where there are 'shadows' appearing on top. If i turn shadows off the errant shadows disappear.

cheers
 
Old 10-03-2012, 12:14 PM   #5
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Quote:
Originally Posted by jobwallis
Its not the underside of the object i'm concerned with - its the top. Where there are 'shadows' appearing on top.
That's related to your shadow type, it's settings, the projection map, and to a degree your a/a settings.

Switch the light over to raytraced shadows and increase the image sampling (a/a) to min:1 and max:16. If you must use shadow maps then you'll need to increase the resolution/sample settings there in addition to the image sampling rate.
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Old 10-04-2012, 03:24 AM   #6
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Thanks Jeff.
That solved it. Raytraced shadows solved it.
Much obliged.
 
Old 10-04-2012, 03:24 AM   #7
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