PBR and Exterior Plant Shadows


CJSpud
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I haven't messed with PBR much but haven't been able to get 3D tree shadows with PBR for an exterior scene.  Is this possible with PBR?  If so, I wonder where I need to go to adjust a setting to get the shadows to show up.  I have looked at some images posted by others of outside PBR scenes where there appear to be shadows so I am assuming it is possible.  I can get the shadows with a ray trace - but not with PBR.  Thanks.

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