Compositor - ID Mask Anti Aliasing not working #49944

New Issue

iMac Retina Late 2015
OS X El Capitan

Blender 2.78a
Worked: 2.76

Anti Aliasing in the ID Mask Node doesn't work anymore.

Left side: Blender 2.78a Right side: Blender 2.76

iMac Retina Late 2015 OS X El Capitan Blender 2.78a Worked: 2.76 Anti Aliasing in the ID Mask Node doesn't work anymore. Left side: Blender 2.78a Right side: Blender 2.76 ![ID Mask AA Bug.jpg](https://archive.blender.org/developer/F393043/ID_Mask_AA_Bug.jpg)

Changed status to: 'Open'

Added subscriber: @ManuelMarino-1

Added subscriber: @Sergey

This was an intentional change in feb574f. The issue was that adding two masks did not give proper full coverage of the image causing compositing artifacts.

However, here it seems there is no AA at all (hard to tell from just seeing the image). It might or might not be a real issue here.

This is why it is always important to attach .blend file which demonstrates the issue.

This was an intentional change in feb574f. The issue was that adding two masks did not give proper full coverage of the image causing compositing artifacts. However, here it seems there is no AA at all (hard to tell from just seeing the image). It might or might not be a real issue here. This is why it is always important to attach .blend file which demonstrates the issue.

Here's the blend file

ID Mask no AA.blend

Here's the blend file [ID Mask no AA.blend](https://archive.blender.org/developer/F394455/ID_Mask_no_AA.blend)

Ok, there is AA in the mask, but it seems to be not enough to give smooth edges. Will try to tweak some parameters to solve both of this problems..

Added subscriber: @mano-wii

Any news here?
I can confirm that although anti aliasing works, it was much better before.

Any news here? I can confirm that although anti aliasing works, it was much better before.

Added subscriber: @dfelinto

This is a know issue, a limitation of the current alias algorithm/implementation.

Added subscriber: @Jeroen-Bakker

We currently have the AA node. From workflow point of view masks can be added and AA afterwards.
For more complex setups use Cryptomatte.

My proposal would be to use the SMAA operators for AA in ID Mask with the default settings. How to use these operators can be found in AntiAliasingNode::convertToOperations.

We currently have the AA node. From workflow point of view masks can be added and AA afterwards. For more complex setups use Cryptomatte. My proposal would be to use the SMAA operators for AA in ID Mask with the default settings. How to use these operators can be found in `AntiAliasingNode::convertToOperations`.

Added subscriber: @tactical_fluke

Hey, I'm a new contributor, and I'd like to pick up this task.

I just submitted a possible patch for this at https://developer.blender.org/D11881

Hey, I'm a new contributor, and I'd like to pick up this task. I just submitted a possible patch for this at https://developer.blender.org/D11881

This issue was referenced by 98c4224ff0

This issue was referenced by 98c4224ff032a746a54cc04b6d9a485620de0f4a

Changed status from 'Confirmed' to: 'Resolved'

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Compositor - ID Mask Anti Aliasing not working #49944