Eevee Alpha Blend #60020

Closed
opened 2018-12-31 21:22:17 +01:00 by pistol ioan · 7 comments

Win 10, gtx970
Blender 2.8 a7c5f4f206

Using Eevee, Alpha Blend shows what is behind the first object.
Please see the attached images and blend file.

Alpha Blend bug.jpg

Alpha Blend bug.blend

Win 10, gtx970 Blender 2.8 a7c5f4f20657 Using Eevee, Alpha Blend shows what is behind the first object. Please see the attached images and blend file. ![Alpha Blend bug.jpg](https://archive.blender.org/developer/F6132501/Alpha_Blend_bug.jpg) [Alpha Blend bug.blend](https://archive.blender.org/developer/F6132502/Alpha_Blend_bug.blend)
Author

Added subscriber: @istoltoto

Added subscriber: @istoltoto

Added subscribers: @fclem, @ZedDB

Added subscribers: @fclem, @ZedDB
Clément Foucault was assigned by Sebastian Parborg 2019-01-01 14:26:19 +01:00

This is a common problem with realtime 3D render engines. If you rotate around a bit. You can see that sometimes the red object is rendered correctly trough the transparent object, and sometimes not.

The problems is the rendering order. When you do not see the red object, the transparent object has been rendered first, so the transparent areas do not get the red object.

Is the rendering order of transparent objects something we plan to change, @fclem ?

This is a common problem with realtime 3D render engines. If you rotate around a bit. You can see that sometimes the red object is rendered correctly trough the transparent object, and sometimes not. The problems is the rendering order. When you do not see the red object, the transparent object has been rendered first, so the transparent areas do not get the red object. Is the rendering order of transparent objects something we plan to change, @fclem ?
Author

Related to this bug I found a new problem.
6789890.jpg

Related to this bug I found a new problem. ![6789890.jpg](https://archive.blender.org/developer/F6214286/6789890.jpg)

Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'

All of this is limitation of alpha blending.

Ordering is based on object origins.

There is no per pixel ordering planned. Use alpha hashed transparency when possible as it is accurate (but noisy).

All of this is limitation of alpha blending. Ordering is based on object origins. There is no per pixel ordering planned. Use alpha hashed transparency when possible as it is accurate (but noisy).
Author

I hope will be implemented in the future the pixel ordering.
Thanks for letting me know.

I hope will be implemented in the future the pixel ordering. Thanks for letting me know.
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Reference: blender/blender#60020
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