Alpha in image texture node broken in Eevee #73760
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Reference: blender/blender#73760
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System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.12
Blender Version
Broken: version: 2.82 (sub 6), branch: master, commit date: 2020-02-11 14:45, hash:
c939b4df18Worked: (optional)
Short description of error
Using Eevee, if an RGBA image is added into the image texture node in a shader network then the alpha does not display.
If a separate image texture node is used with an alpha only input file the alpha can be added in, suggesting that the alpha output of the image texture node isn't working.
To illustrate, image textures have been added to two mesh emitters, one with one texture node with an RGBA image (left), one with two texture nodes, one for the RGB and one for the alpha (right). Below the rendered views of the two emitters are shown in Eevee rendered view with blend mode set to 'Alpha Hashed'
Below is what the emitters looks like in Cycles:
Here is the shader network for the emitter on the left:
and the emitter on the right:
I have also attached the blend file used to show this bug and the two image files used.
alpha_bug.blend
Exact steps for others to reproduce the error
Added subscriber: @lexielodge
Added subscriber: @Blendify
Changed status from 'Needs Triage' to: 'Needs User Info'
Make sure the alpha mode is set to "Channel Packed" https://docs.blender.org/manual/en/dev/editors/image/image_settings.html#editors-image-image-settings-common
This doesn't solve the issue for me
Changed status from 'Needs User Info' to: 'Needs Triage'
Added subscriber: @mano-wii
Changed status from 'Needs Triage' to: 'Confirmed'
Thansk for the report, I was able to reproduce the problem.
But I think the report can be simplified to "Alpha Channel of a Texture is not displayed in Eevee"
Here is the simplified file:
alpha_eevee_bug.blend
Is there anything I ignored or can I update the report description?
Added subscriber: @lichtwerk
For this EXR
rgba.exrblender as a whole doesnt seem to be able to read alpha. (not sure yet whether this is correct or not)Image metadata tells the following:
oiiotool.exe some.tif someother.tif -chappend -o rgba.exr-chappendoption documents the following:it now has the following layers in the EXR:
Color.RGBY.Y?Not exactly sure why Cycles can interpret that
Y.Ylayer as alpha [this might be correct though -- cycles uses oiio as well, maybe that is on that side of the puzzle, needs more investigation...]If you provide Eevee an EXR that has the Alpha in the
Aof theColor.RGBAlayer, Eevee can do that without problems...Natron doesnt recognize the
Y.Ychannel as Alpha by default either...Added subscriber: @brecht
Looking at this doesnt help (me at least) much either
If it is just luminace, should this always be read as Alpha?
Maybe @brecht knows?
Added subscriber: @iss
File rgba.exr opened in gimp has no alpha channel, in krita it does.
Not working in 2.79 as well
Files created with blender doesn't seem to have this problem.
This channel layout is nonsensical, how to interpret it is probably not defined anywhere.
My advice is to close this as not a bug, it's not worth spending time to support OpenEXR images that don't follow the standard, created with a command line tool.
Changed status from 'Confirmed' to: 'Archived'
OK, will close then
@lexielodge: feel free to comment again if you can provide further information about this specific EXR channel layout (and/or its usecase, standard etc)
Have confirmed was issue with the test image file - hadn't realised that the oiiotool had generated the image with incorrectly labelled channels. Thanks.