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Maniphest T74367

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

smooth shading issue.blend612 KBDownload

Revisions and Commits

rB Blender
Needs ReviewD9833 Correct bump mapping for smooth normals

Related Objects

Event Timeline

NXSK (NXSK) created this task.Mar 2 2020, 2:22 PM
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
Jacques Lucke (JacquesLucke) added a subscriber: Jacques Lucke (JacquesLucke).

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
In T74367#884221, @Jacques Lucke (JacquesLucke) wrote:

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
Germano Cavalcante (mano-wii) added subscribers: Brecht Van Lommel (brecht), Germano Cavalcante (mano-wii).Mar 12 2020, 12:36 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".
Germano Cavalcante (mano-wii) added projects: EEVEE & Viewport, Render & Cycles.

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.

NXSK (NXSK) added a comment.Mar 17 2020, 6:31 AM
In T74367#889804, @Germano Cavalcante (mano-wii) wrote:

@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.

Roman (rowvn) added a subscriber: Roman (rowvn).May 5 2020, 1:30 PM
Clément Foucault (fclem) moved this task from Backlog to Known Issues on the EEVEE & Viewport board.Jun 22 2020, 6:00 PM
Clément Foucault (fclem) merged a task: T74981: Bump produces sharp seams on edges even with procedural textures..Jun 28 2020, 2:11 AM
Clément Foucault (fclem) added subscribers: Vyacheslav (hitrpr), • isshak (isshak), Richard Antalik (ISS).
Vyacheslav (hitrpr) added a comment.Oct 10 2020, 3:21 PM
In T74367#890476, @Germano Cavalcante (mano-wii) wrote:

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.

Michael Möller (mmoeller) mentioned this in D9833: Correct bump mapping for smooth normals.Dec 11 2020, 10:39 PM
Michael Möller (mmoeller) added a revision: D9833: Correct bump mapping for smooth normals.Dec 11 2020, 10:41 PM
Michael Möller (mmoeller) added a subscriber: Michael Möller (mmoeller).Dec 11 2020, 10:46 PM

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.

Mikhail Matrosov (ktdfly) added a subscriber: Mikhail Matrosov (ktdfly).Dec 18 2020, 5:09 PM
michael campbell (3di) added a subscriber: michael campbell (3di).Mar 15 2021, 11:41 PM

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