EEVEE doesent render transparent alpha blend mode properly #62369

New Issue

Josua Thurnheer · 2019-03-08T20:29:50+01:00

Josua Thurnheer commented

2019-03-08 20:29:50 +01:00

System Information
Operating system:
Graphics card:

Blender Version
Broken:
(example: 2.79b release)
(example: 2.80, edbf15d3c0, blender2.8, 2018-11-28, as found on the splash screen)
Worked: (optional)

When using images as planes, with alpha blend, eevee seems to ignore the texture if a glass object is placed in front, does only work if the plane is solid.

Import images as planes, select png file with transparent backgroung, render settings > enable Screen Space Reflection > refraction, in Material > settings > alpha blend
display in render preview
place object with simple glass shader in front
voilah- doesent render any texture, only BG for some reason.

**System Information** Operating system: Graphics card: **Blender Version** Broken: (example: 2.79b release) (example: 2.80, edbf15d3c044, blender2.8, 2018-11-28, as found on the splash screen) Worked: (optional) When using images as planes, with alpha blend, eevee seems to ignore the texture if a glass object is placed in front, does only work if the plane is solid. Import images as planes, select png file with transparent backgroung, render settings > enable Screen Space Reflection > refraction, in Material > settings > alpha blend display in render preview place object with simple glass shader in front voilah- doesent render any texture, only BG for some reason.

Josua Thurnheer commented

2019-03-08 20:29:50 +01:00

Added subscriber: @Josua-Thurnheer

Josua Thurnheer commented

2019-03-08 20:42:05 +01:00

sorry, blender 2.80 03-08-2019

also, why does screen space refraction in the material settings ignore the texture even if its not alpha blend, for example: clip or hashed suddenly stop working as well if its turned on?

sorry, blender 2.80 03-08-2019 also, why does screen space refraction in the material settings ignore the texture even if its not alpha blend, for example: clip or hashed suddenly stop working as well if its turned on?

Sebastian Parborg commented

2019-03-09 12:43:33 +01:00

Added subscriber: @ZedDB

Clément Foucault was assigned by Sebastian Parborg

2019-03-09 12:43:33 +01:00

Sebastian Parborg commented

2019-03-09 12:43:33 +01:00

I can confirm this issue:
alpha.blend

I don't see anything mentioning this on https://docs.blender.org/manual/en/dev/render/eevee/limitations.html so I guess this is a bug?

I can confirm this issue: [alpha.blend](https://archive.blender.org/developer/F6789802/alpha.blend) I don't see anything mentioning this on https://docs.blender.org/manual/en/dev/render/eevee/limitations.html so I guess this is a bug?

Clément Foucault commented

2019-03-22 15:12:01 +01:00

This is because alpha blended objects do not write to the depth buffer and cannot be "raytraced". Only opaque/hashed alpha can be seen through refraction due to rendering order.

I'll add this to the limitations section of the documentation.

This is because alpha blended objects do not write to the depth buffer and cannot be "raytraced". Only opaque/hashed alpha can be seen through refraction due to rendering order. I'll add this to the limitations section of the documentation.

Clément Foucault commented

2019-03-22 15:21:23 +01:00

Changed status from 'Open' to: 'Archived'

Clément Foucault closed this issue

2019-03-22 15:21:23 +01:00

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EEVEE doesent render transparent alpha blend mode properly #62369