Weird behaviour of Holdouts in Eevee #75520

New Issue

Radek Goláň · 2020-04-08T10:23:43+02:00

Radek Goláň commented

2020-04-08 10:23:43 +02:00

System Information
Operating system: Windows 10 Pro (1909)
Graphics card: Quadro 4100M

Blender Version
Broken: v2.82
Worked: n/a

Short description of error
Holdouts in Eevee sometimes work, sometimes don't.
I've got four "output" projects total, and two libraries. All of the projects use Eevee as the render engine. Three out of four of the projects that use the Holdout setting in the Outliner work as expected, with the "mask" objects being within the file itself.
One project that does the same thing renders the mask objects with the default material, while the mask object's collection is linked from a library.

Exact steps for others to reproduce the error

Create lib.blend with a collection containing an object to serve as a holdout object. (My case was leaving the materials empty)
Create proj.blend which links the collection from lib.blend, and set holdout on the parent collection

In Cycles, this will render as expected - the linked collection's objects will be used as holdout/mask objects.
In Eevee however, the linked collection objects will be rendered with the default material instead.

Also note, that in the rendered viewport, the holdout behaves as expected.

Workaround
In lib.blend, set the material on the collection's objects to "Holdout".

**System Information** Operating system: Windows 10 Pro (1909) Graphics card: Quadro 4100M **Blender Version** Broken: v2.82 Worked: n/a **Short description of error** Holdouts in Eevee sometimes work, sometimes don't. I've got four "output" projects total, and two libraries. All of the projects use Eevee as the render engine. Three out of four of the projects that use the Holdout setting in the Outliner work as expected, with the "mask" objects being within the file itself. One project that does the same thing renders the mask objects with the default material, while the mask object's collection is linked from a library. **Exact steps for others to reproduce the error** 1. Create lib.blend with a collection containing an object to serve as a holdout object. (My case was leaving the materials empty) 2. Create proj.blend which links the collection from lib.blend, and set holdout on the parent collection In Cycles, this will render as expected - the linked collection's objects will be used as holdout/mask objects. In Eevee however, the linked collection objects will be rendered with the default material instead. Also note, that in the rendered viewport, the holdout behaves as expected. **Workaround** In lib.blend, set the material on the collection's objects to "Holdout".

Radek Goláň commented

2020-04-08 10:23:43 +02:00

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