EEVEE: Alpha Blend + Show Backface material is out of focus. #76752

New Issue

Maciej · 2020-05-14T16:30:45+02:00

Maciej commented

2020-05-14 16:30:45 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.87

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: 375c7dc4ca
Worked: (optional)

Short description of error
In EEVEE when the DOF is on, and the focus is on the glass object, it is blurred.
Only when you set the focus on an object that can be seen through the glass, it becomes sharp.

I set up a simple animation in the blender file, where the camera's DOF is fixed on the glass ball, and the background moves forward and backward.
Focus is only caught when the background overlaps with the ball.

Exact steps for others to reproduce the error

Open Attached File
disable and enableShow Backface
focus bug.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2060 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.87 **Blender Version** Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-03-12 05:06, hash: `375c7dc4ca` Worked: (optional) **Short description of error** In EEVEE when the DOF is on, and the focus is on the glass object, it is blurred. Only when you set the focus on an object that can be seen through the glass, it becomes sharp. I set up a simple animation in the blender file, where the camera's DOF is fixed on the glass ball, and the background moves forward and backward. Focus is only caught when the background overlaps with the ball. **Exact steps for others to reproduce the error** - Open Attached File - disable and enable`Show Backface` [focus bug.blend](https://archive.blender.org/developer/F8535367/focus_bug.blend)

Maciej commented

2020-05-14 16:30:45 +02:00

Added subscriber: @tomala3d

blender-admin commented

2020-05-14 16:30:45 +02:00

#95388 was marked as duplicate of this issue

blender-admin commented

2020-05-14 16:30:45 +02:00

#82806 was marked as duplicate of this issue

Jordan Matelsky commented

2020-05-14 20:53:29 +02:00

Added subscriber: @j6m8

Jordan Matelsky commented

2020-05-14 20:53:29 +02:00

With "Show Backface" disabled, this problem goes away (Mac Catalina, Blender 2.90 alpha)

"Correct" behavior from actual optics physics; with focus on the glass object, the geometry of the glass should be in-focus, but the background refraction should NOT be. (With focus on the background, the background refraction should be in focus, but the "edge" of the glass may look fuzzy.)

With "Show Backface" disabled, this problem goes away (Mac Catalina, Blender 2.90 alpha) ![image.png](https://archive.blender.org/developer/F8535891/image.png) ![image.png](https://archive.blender.org/developer/F8535889/image.png) "Correct" behavior from actual optics physics; with focus on the glass object, the geometry of the glass should be in-focus, but the background refraction should NOT be. (With focus on the background, the background refraction should be in focus, but the "edge" of the glass may look fuzzy.)

Fynn Grotehans commented

2020-05-15 01:41:38 +02:00

Added subscriber: @FynnGr

Fynn Grotehans commented

2020-05-15 01:41:38 +02:00

I've also no problem with disabled "Show backface" option (Win10 64bit 2.82(sub7))

Germano Cavalcante changed title from ~~EEVEE Glass out of focus~~ to EEVEE: Alpha Blend + Show Backface material is out of focus.

2020-05-15 16:16:31 +02:00

Germano Cavalcante commented

2020-05-15 16:16:31 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2020-05-15 16:17:46 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-05-15 16:17:46 +02:00

It doesn't have to be glass, it can be any material, as long as it has the option Show Backface enabled.

It doesn't have to be glass, it can be any material, as long as it has the option `Show Backface` enabled.

Maciej commented

2020-05-17 12:24:07 +02:00

The temporary solution is: using the mixed Principled BSDF with shader and changing the transparency blend to HASZED.

Blender_eevee_DOF 2020-05-17 11-59-01.mp4

The temporary solution is: using the mixed Principled BSDF with shader and changing the transparency blend to HASZED. [Blender_eevee_DOF 2020-05-17 11-59-01.mp4](https://archive.blender.org/developer/F8539894/Blender_eevee_DOF_2020-05-17_11-59-01.mp4)

Clément Foucault commented

2020-05-18 16:17:00 +02:00

Added subscriber: @fclem

Clément Foucault commented

2020-05-18 16:17:00 +02:00

This is a limitation. Transparent object using alpha blend mode do not write to the depth buffer if you enable show backface. So the defocus will not be correct.

Robert Guetzkow commented

2020-11-18 11:02:12 +01:00

Added subscribers: @JJones, @rjg

Germano Cavalcante commented

2022-02-02 17:21:12 +01:00

Added subscriber: @TheJeran

Jacob Merrill commented

2022-02-02 17:36:44 +01:00

Added subscriber: @JacobMerrill-1

Jacob Merrill commented

2022-02-02 17:36:44 +01:00

could we add a output aov channel that is allocated auto - depth - so people can write their own info to the depth pass before the DOF?

Philipp Oeser removed the

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EEVEE: Alpha Blend + Show Backface material is out of focus. #76752