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trouble illuminating a glass box w/ GI in redshift


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I'm trying to render a kiosk that has 3 sides of glass.  I can't get good illumination in there without turning off one side.  I've put Redshift object tags on the glass and turned off the "seen by GI" options, but nothing changes.  What am I doing wrong?

one_side_off.jpg

closed box.jpg

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A few thoughts:

 

1. If your glass sheets have thickness - check the normals are correct and facing outwards.

 

2. If the glass is just a single poly - eg not a solid - then use the Redshift material 'thin wall' refraction option.

 

Finally - here are my general notes on rendering glass with Redshift.


For best quality:
Lights and HDRI domes > Ray : Affected by refraction: always
Material > Optimisations : Cull Dim Internal Reflections : off
Material > Advanced : shadow opacity may need to be increased.
Render settings > Optimization : Reflection/Refraction/Combined: 16

 

Could it be related to shadow opacity?

 

I hope this helps.

 

EDIT:  just one other thought: Are you using a custom material? If so, try it with the preset RS Material > glass preset. If that works OK, it's likely to be some custom material setting if you've built your own glass.

 

 

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