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Poor shadow smooth when using bump
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System Information
Windows 10 and Geforce 1070

Blender Version

Short description of error

When applying bump map to the material, the shadows are no longer smooth. they loose quality.

A workaround is to set the lights size to 1, at least. But for using HDRI, i don't know what to do..



Event Timeline

Philipp Oeser (lichtwerk) closed this task as Archived.Apr 17 2018, 1:02 PM
Philipp Oeser (lichtwerk) claimed this task.

I believe this is caused by an extreme value for bump (causing the normals to point in all kinds of directions). Or I'll quote @Brecht Van Lommel (brecht) from T54498:

In general such artifacts can happen if the normals are too different from the actual geometry, and the low poly geometry reveals itself

another quote from there:

It's another case of the terminator problem. We have some work towards improving it in D2574 but there's no easy solutions in general.

As a workaround you can lower the value of your multiply node, or better in this case use True displacement / Adaptive Subdivision, see the manual

I dare archiving this as known limitation, unless @Brecht Van Lommel (brecht) has something to add?