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Can't make crystal clear glass material
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Description

System Information
Operating system: windows 10
Graphics card: gtx 970

Blender Version
Broken: 2.91.0
Worked: none

Exact steps for others to reproduce the error
Default cube with Glass BSDF Shader and set roughness to zero (Use Principled BSDF to make glass give the same result).
Use a sun light with 0 degree angle to illuminate the scene.

The glass material in render result still has some roughness. The object in the glass is not lit enough and the shadow is too soft.

editor

render result

Event Timeline

Robert Guetzkow (rjg) closed this task as Archived.Dec 29 2020, 7:44 PM

Thank you for your report. Unfortunately, the bug tracker is not right place for questions about learning or using Blender. Please post a question on one of our community websites, for instance Blender's StackExchange, blenderartists.org or the #support channel on Blender chat.

It seems that the number of samples you're using is too low for a noise free result.

But why the shadow that soft?