Lens Distortion node Error #51271

New Issue

Tyler Coggins · 2017-04-21T03:15:46+02:00

Tyler Coggins commented

2017-04-21 03:15:46 +02:00

System Information
Tested on:
Windows Vista 32bit
Linux Mint 64bit
Windows 8 64bit
Also reproduced by two others in IRC #Blender

Blender Version
Broken: 2.77, 2.78, buildbot 2.78.4
Worked: 2.76b

Short description of error
Lines along edges of image

Exact steps for others to reproduce the error
Open default scene, render, in compositing add Lens Distortion node.
Along bottom edge as well at 100% render size
Dispersion Error.blend

Believe the cause to be Dispersion as changing setting from 0.0000001 through 0.0000009 changes shape and color of lines.

Also get lines along render tile edges randomly but unable reproduce consistantly.

**System Information** Tested on: Windows Vista 32bit Linux Mint 64bit Windows 8 64bit Also reproduced by two others in IRC #Blender **Blender Version** Broken: 2.77, 2.78, buildbot 2.78.4 Worked: 2.76b **Short description of error** Lines along edges of image **Exact steps for others to reproduce the error** Open default scene, render, in compositing add Lens Distortion node. Along bottom edge as well at 100% render size [Dispersion Error.blend](https://archive.blender.org/developer/F562005/Dispersion_Error.blend) ![Dispersion Error 1b.png](https://archive.blender.org/developer/F562007/Dispersion_Error_1b.png) Believe the cause to be Dispersion as changing setting from 0.0000001 through 0.0000009 changes shape and color of lines. ![Dispersion Error 1.png](https://archive.blender.org/developer/F562012/Dispersion_Error_1.png) Also get lines along render tile edges randomly but unable reproduce consistantly.

Tyler Coggins commented

2017-04-21 03:15:46 +02:00

Changed status to: 'Open'

Tyler Coggins commented

2017-04-21 03:15:46 +02:00

Added subscriber: @Royce

Tyler Coggins commented

2017-04-21 03:37:01 +02:00

buildbot hash value in report (now removed) caused Mention of fix with same value in name, not sure how to remove/unmention.

Sergey Sharybin commented

2017-05-19 16:05:10 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2017-05-19 16:05:10 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2017-05-19 16:05:10 +02:00

Sergey Sharybin self-assigned this 2017-05-19 16:05:10 +02:00

Sergey Sharybin commented

2017-05-19 16:05:10 +02:00

This isn't really a bug. It is caused by some numerical changes and extra clamping applied after 2.76. Those fixes were needed to fix other artifacts in compositor.

This black line is coming from the node implementation itself. If you increase distortion to higher values (~0.2) then you'll see the black outline around the image. It is coming from the malformed handling of alpha and anti-aliasing on edges with the particular lens distortion node.

So thanks for the report, but it's just a limitation of math used in this node..

This isn't really a bug. It is caused by some numerical changes and extra clamping applied after 2.76. Those fixes were needed to fix other artifacts in compositor. This black line is coming from the node implementation itself. If you increase distortion to higher values (~0.2) then you'll see the black outline around the image. It is coming from the malformed handling of alpha and anti-aliasing on edges with the particular lens distortion node. So thanks for the report, but it's just a limitation of math used in this node..

Tyler Coggins commented

2017-05-20 05:24:22 +02:00

Alright, and to double check .

Having artifacts with dispersion in use, set to a value greater than defualt 0, I understand.

The problem is that the lines are there with the default 0 value, at which it shouldn't effect the image.

I'll have to find a work around to add Jitter noise to images then.

Thanks for information.

Alright, and to double check . Having artifacts with dispersion in use, set to a value greater than defualt 0, I understand. The problem is that the lines are there with the default 0 value, at which it shouldn't effect the image. I'll have to find a work around to add Jitter noise to images then. Thanks for information.

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Lens Distortion node Error #51271