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Bump Map and Normal Map causes flat shading.
Confirmed, NormalPublicKNOWN ISSUE

Description

System Information
Operating system: windows 10 1903
Graphics card: 1080ti * 2

Blender Version
Broken: 2.82.7 stable versioin

Short description of error
This issue appears both on eevee and cycles.
While using smooth shading, simply add a bump map and the shading lookes flattened.

This problem will occur on a high poly model if the camera is close enough.

Exact steps for others to reproduce the error
Bevel the cube with several segments and simply plug a bump map to the normal port of the shader node.

Revisions and Commits

Event Timeline

NXSK (NXSK) updated the task description. (Show Details)Mar 2 2020, 2:31 PM
Jacques Lucke (JacquesLucke) changed the task status from Needs Triage to Needs Information from User.Mar 3 2020, 12:56 PM

I'm not sure if this is a bug or limitation. Did this ever look differently?

NXSK (NXSK) added a comment.EditedMar 4 2020, 10:51 AM

I'm not sure if this is a bug or limitation. Did this ever look differently?

I just tested with no bump or normal map. Smooth shading doesn't look absolutely smooth. Whatever auto smooth angle I set, there is still a bit of flat shading look. Even the model is subdivided (the mesh is dense enough), the flat shading look is still there.


This is a single cube, I beveled all edges with 1 segment and 1 profile then subdivided it and set it to smooth shading.

Germano Cavalcante (mano-wii) changed the task status from Needs Information from User to Needs Triage.Mar 11 2020, 7:41 PM

@Brecht Van Lommel (brecht), I can't tell if this is a Bug, Known Issue or intended.
Any light you can shed on this?

Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.Mar 13 2020, 11:57 AM
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Known Issue".

As the problem is seen in both Cycles and Eevee, I believe this is a Known Issue.
It doesn't seem to be something that can be resolved anytime soon.

@Brecht Van Lommel (brecht), I can't tell if this is a Bug, Known Issue or intended.
Any light you can shed on this?

Small light makes this issue more obvious. With a HDRI the situation can be better but still can be noticable from a close look.

But eevee don't have the same issue. It works fine.

Thank you.

As the problem is seen in both Cycles and Eevee, I believe this is a Known Issue.
It doesn't seem to be something that can be resolved anytime soon.

Sad. It closes big part of pipeline.

The differential https://developer.blender.org/D9833 should fix the flat shading artifacts when using the inputs "Geometry: Position" and "Texture Coordinate: Object" in Eevee and Cycles. The artifacts visible when using the "Texture Coordinate: Generated" input remain unfixed.

did anyone try @Michael Möller (mmoeller) 's patch with success? I'm still getting the faceting as soon as a bump node is attached.