Material ID aliasing artifacts #52185

New Issue

Aaron Smithey · 2017-07-25T05:39:44+02:00

Aaron Smithey commented

2017-07-25 05:39:44 +02:00

System Information
Windows 7 x64 Nvidia GTX 970

Blender Version
2.78 e8299c8

Short description of error

Not sure why the material ID Masks have such extreme aliasing artifacts. I really wish Blender had an pure Alpha ID mask node. Very similar to how the material ID Mask node works by assigning a index number to a material, but instead of crude ID Masks it could generate high quality alpha masks that could be exported for compositing in Photoshop. I could just render my entire scene and pump out as many alpha masks that i need for color correction in Photoshop.

Thanks

Exact steps for others to reproduce the error
no steps required.

**System Information** Windows 7 x64 Nvidia GTX 970 **Blender Version** 2.78 e8299c8 **Short description of error** Not sure why the material ID Masks have such extreme aliasing artifacts. I really wish Blender had an pure Alpha ID mask node. Very similar to how the material ID Mask node works by assigning a index number to a material, but instead of crude ID Masks it could generate high quality alpha masks that could be exported for compositing in Photoshop. I could just render my entire scene and pump out as many alpha masks that i need for color correction in Photoshop. Thanks ![Material ID.png](https://archive.blender.org/developer/F677985/Material_ID.png) **Exact steps for others to reproduce the error** no steps required.

Aaron Smithey commented

2017-07-25 05:39:44 +02:00

Changed status to: 'Open'

Aaron Smithey commented

2017-07-25 05:39:44 +02:00

Added subscriber: @AaronSmithey

Brecht Van Lommel commented

2017-07-25 18:05:18 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2017-07-25 18:05:18 +02:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2017-07-25 18:05:18 +02:00

Brecht Van Lommel self-assigned this 2017-07-25 18:05:18 +02:00

Brecht Van Lommel commented

2017-07-25 18:05:18 +02:00

Thanks for the report, but this is a known limitation at the moment. We can't antialias these ID masks since if you assign e.g. ID 10, then you might get any value between 0 and 10 and so you can't identify the object anymore.

We would like to improve things here (see for example D2106), but this is a feature request and not a bug, and so we don't track that here.

Thanks for the report, but this is a known limitation at the moment. We can't antialias these ID masks since if you assign e.g. ID 10, then you might get any value between 0 and 10 and so you can't identify the object anymore. We would like to improve things here (see for example [D2106](https://archive.blender.org/developer/D2106)), but this is a feature request and not a bug, and so we don't track that here.

Aaron Smithey commented

2018-01-16 22:30:49 +01:00

Hi. I know this thread is closed. But along the lines of the aliasing that is associated with the ID Masks, have you seen this node solution for generating quality alpha masks? https://www.youtube.com/watch?v=f1KvYync1VM. It is in German but easy to follow. I have been using this node group to render out individual alpha masks for compositing, Is there any way to incorporate this type of functionality into the rendering of the material and object ID Masks with Cycles. This method produces clean edges for compositing.
Thanks

Hi. I know this thread is closed. But along the lines of the aliasing that is associated with the ID Masks, have you seen this node solution for generating quality alpha masks? https://www.youtube.com/watch?v=f1KvYync1VM. It is in German but easy to follow. I have been using this node group to render out individual alpha masks for compositing, Is there any way to incorporate this type of functionality into the rendering of the material and object ID Masks with Cycles. This method produces clean edges for compositing. Thanks

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Material ID aliasing artifacts #52185