Blender Eevee reflection missing with default Image as Plane import settings #76709

New Issue

Fred Sprinkle · 2020-05-13T07:12:30+02:00

Fred Sprinkle commented

2020-05-13 07:12:30 +02:00

System Information
Windows 10 Laptop
1050i

Blender Version
2.82 Eevee Render Engine

Short description of error

When using the "Image As Plane" import feature in Eevee, the reflection seems missing/messed up. Changing the transparency settings to Alpha Hashed seems to work, but the default Alpha Blend does not work.

Notes: the DOF is also messed up with default settings. Of course Screen Space Reflections has been toggled.

**System Information** Windows 10 Laptop 1050i **Blender Version** 2.82 Eevee Render Engine **Short description of error** When using the "Image As Plane" import feature in Eevee, the reflection seems missing/messed up. Changing the transparency settings to Alpha Hashed seems to work, but the default Alpha Blend does not work. ![2020-05-12-22_02_57-Blender.jpg](https://archive.blender.org/developer/F8532163/2020-05-12-22_02_57-Blender.jpg) Notes: the DOF is also messed up with default settings. Of course Screen Space Reflections has been toggled.

Fred Sprinkle commented

2020-05-13 07:12:30 +02:00

Added subscriber: @FredSprinkle

Alaska commented

2020-05-13 07:26:25 +02:00

Added subscriber: @Alaska

Alaska commented

2020-05-13 07:26:25 +02:00

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

Alaska closed this issue

2020-05-13 07:26:25 +02:00

Alaska self-assigned this 2020-05-13 07:26:25 +02:00

Alaska commented

2020-05-13 07:26:25 +02:00

The Blender manual says this about screen space effects like reflections:

Blended surfaces are not considered by these effects.

This means Blender is operating as expected. I will mark this report as Invalid.

The [Blender manual ](https://docs.blender.org/manual/en/dev/render/eevee/limitations.html) says this about screen space effects like reflections: > Blended surfaces are not considered by these effects. This means Blender is operating as expected. I will mark this report as Invalid.

Fred Sprinkle commented

2020-05-13 17:52:22 +02:00

While you are correct that there is no technical bug, the experience does feel broken when you import an image as plane. It is experienced as "broken" compared to everything else in the scene. Perhaps Alpha Hashed would be a better default? Not sure.

Alaska commented

2020-05-14 00:47:13 +02:00

Added subscribers: @pioverfour, @florianfelix

Alaska commented

2020-05-14 00:47:13 +02:00

Alpha hashed may be a better default for the import images as planes addon, however I believe it wasn't picked because Alpha hashed objects can cause visual noise in EEVEE. Not 100% sure. See this part of the manual.

Alpha Hashed
The previous color will be overwritten by the surface color, but only if the alpha value is above a random clip threshold. This statistical approach is noisy but is able to approximate alpha blending without any sorting problem. Increasing the sample count in the render settings will reduce the resulting noise.

Actually, checking the original commit (blender/blender-addons@0f5738d902) for the addition of alpha support in import images as planes, there's no explanation for why they picked Alpha Blend over anything else.

@florianfelix or @pioverfour are you able to comment of this?

Alpha hashed may be a better default for the import images as planes addon, however I believe it wasn't picked because Alpha hashed objects can cause visual noise in EEVEE. Not 100% sure. See [this part ](https://docs.blender.org/manual/en/latest/render/eevee/materials/settings.html) of the manual. > **Alpha Hashed** > The previous color will be overwritten by the surface color, but only if the alpha value is above a random clip threshold. This statistical approach is noisy but is able to approximate alpha blending without any sorting problem. Increasing the sample count in the render settings will reduce the resulting noise. Actually, checking the original commit (blender/blender-addons@0f5738d902) for the addition of alpha support in import images as planes, there's no explanation for why they picked Alpha Blend over anything else. @florianfelix or @pioverfour are you able to comment of this?

Damien Picard commented

2020-05-14 01:29:41 +02:00

Hi,
at the time I made that commit (blender/blender-addons@0f5738d902), the add-on didn’t select any transparency whatsoever, as seen in blender/blender-addons#67239. I just made the commit because the task had been sitting for a while, but the default wasn’t an opinionated choice from me; if a better one can be chosen, that’s good.
But I suspect there may be many usages for this add-on, so choosing a default may not be very easy, and I don’t know the implications of each setting well enough to help here, sorry.

Hi, at the time I made that commit (blender/blender-addons@0f5738d902), the add-on didn’t select any transparency whatsoever, as seen in blender/blender-addons#67239. I just made the commit because the task had been sitting for a while, but the default wasn’t an opinionated choice from me; if a better one can be chosen, that’s good. But I suspect there may be many usages for this add-on, so choosing a default may not be very easy, and I don’t know the implications of each setting well enough to help here, sorry.

Alaska commented

2020-05-14 01:40:15 +02:00

@pioverfour That's alright. I was looking over other tasks and found one discussing why "Opaque" was the default blending mode and one of the developers said that each blending mode has it's own advantages and so picking a proper default that worked for everyone would be difficult (Lining up with what you're saying).

Thank you for taking the time to answer.

@pioverfour That's alright. I was looking over other tasks and found one discussing why "Opaque" was the default blending mode and one of the developers said that each blending mode has it's own advantages and so picking a proper default that worked for everyone would be difficult (Lining up with what you're saying). Thank you for taking the time to answer.

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Blender Eevee reflection missing with default Image as Plane import settings #76709