Shadow Catcher artifacts when under transparency #52229

New Issue

Gustavo Niemeyer · 2017-07-31T05:30:05+02:00

Gustavo Niemeyer commented

2017-07-31 05:30:05 +02:00

This is a follow up on #52021 which was more specific to Branched Path Tracing and which ended up partly addressing some issues with transparency as well. This new task is specific to the handling of transparency, as requested by @Sergey and detailed below.

These tests used a nightly build of Blender, version 2.78.5 1bd9531fda.

The example starts off with some text rendering with an opacity of 0.3, and the outcome looks plausible:

But bringing the opacity all the way down to zero shows the issue:

Taking these phantom shadows and artifacts and blending over the original scene shows the exact positions of the artifacts:

Here is the blend file for the scene:

shadow-catcher-bug-2.blend

This is a follow up on #52021 which was more specific to Branched Path Tracing and which ended up partly addressing some issues with transparency as well. This new task is specific to the handling of transparency, as requested by @Sergey and detailed below. These tests used a nightly build of Blender, version 2.78.5 1bd9531fda7. The example starts off with some text rendering with an opacity of 0.3, and the outcome looks plausible: ![image.png](https://archive.blender.org/developer/F686793/image.png) But bringing the opacity all the way down to zero shows the issue: ![image.png](https://archive.blender.org/developer/F686795/image.png) Taking these phantom shadows and artifacts and blending over the original scene shows the exact positions of the artifacts: ![image.png](https://archive.blender.org/developer/F686808/image.png) Here is the blend file for the scene: [shadow-catcher-bug-2.blend](https://archive.blender.org/developer/F686811/shadow-catcher-bug-2.blend)

Sergey Sharybin was assigned by Gustavo Niemeyer

2017-07-31 05:30:05 +02:00

Gustavo Niemeyer commented

2017-07-31 05:30:05 +02:00

Changed status to: 'Open'

Gustavo Niemeyer commented

2017-07-31 05:30:05 +02:00

Added subscribers: @Sergey, @niemeyer

blender-admin commented

2017-08-11 09:33:18 +02:00

This issue was referenced by blender/cycles@4249d6dc6c

This issue was referenced by blender/cycles@4249d6dc6cca6db8eb3f768ed92d7219dc501d11

blender-admin commented

2017-08-11 09:33:18 +02:00

This issue was referenced by bd069a89aa

This issue was referenced by bd069a89aa3a2d166bc7cb4746a2b757497fdddc

Sergey Sharybin commented

2017-08-11 13:56:29 +02:00

Changed status from 'Open' to: 'Resolved'

Sergey Sharybin closed this issue

2017-08-11 13:56:29 +02:00

Sergey Sharybin commented

2017-08-11 13:57:58 +02:00

Committed some tweaks to help with transparent objects.

Please note that with this exact file you'll see some artifacts. Those are caused by path termination caused by max transparent bounces. increasing transparent bounces fixes those artifacts.

Committed some tweaks to help with transparent objects. Please note that with this exact file you'll see some artifacts. Those are caused by path termination caused by max transparent bounces. increasing transparent bounces fixes those artifacts.

Gustavo Niemeyer commented

2017-08-14 19:50:25 +02:00

Thanks again Sergey.

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Shadow Catcher artifacts when under transparency #52229