Blender Cycles Render make weird scratches on surface of objects when it's following path #54284

New Issue

Łukasz Debita · 2018-03-10T08:41:06+01:00

Łukasz Debita commented

2018-03-10 08:41:06 +01:00

System Information
My laptop:
GeForce GTX 1060 6gb with Max-Q Design
16 GB RAM
i7-7700HQ CPU @ 2.80GHz
Windows 10 (x64)

and also other PC with similar set up, the differences:
32 GB Ram,
GeForce GTX 1070 TI

Blender Version
2.79a Hash: 8928d99270, Date: 2018-02-21 (but in just 2.79 was the same problem)

Short description of error
When pieces of a car parrented to an Empty Cube (called: "CAR") are moving (because of the Empty Cube movement by Follow Path Constrain), after frame 328 it is starting to makes weird scratches on the surface of the objects. Regardless of Motion Blur, Material Settings, World Settings, Modifiers... But when you disable the Follow Path Constrain on the Empty Cube the scratches are gone.

The very extreme sctraches are visable after frame 420.

glitch.blend

Exact steps for others to reproduce the error
Just turn on rendering, even in viewport

**System Information** My laptop: GeForce GTX 1060 6gb with Max-Q Design 16 GB RAM i7-7700HQ CPU @ 2.80GHz Windows 10 (x64) and also other PC with similar set up, the differences: 32 GB Ram, GeForce GTX 1070 TI **Blender Version** 2.79a Hash: 8928d99270f, Date: 2018-02-21 (but in just 2.79 was the same problem) **Short description of error** When pieces of a car parrented to an Empty Cube (called: "CAR") are moving (because of the Empty Cube movement by Follow Path Constrain), after frame 328 it is starting to makes weird scratches on the surface of the objects. Regardless of Motion Blur, Material Settings, World Settings, Modifiers... But when you disable the Follow Path Constrain on the Empty Cube the scratches are gone. The very extreme sctraches are visable after frame 420. ![Glitch2.jpg](https://archive.blender.org/developer/F2433336/Glitch2.jpg) ![Glitch1.jpg](https://archive.blender.org/developer/F2433334/Glitch1.jpg) [glitch.blend](https://archive.blender.org/developer/F2433335/glitch.blend) **Exact steps for others to reproduce the error** Just turn on rendering, even in viewport

Łukasz Debita commented

2018-03-10 08:41:06 +01:00

Added subscriber: @LukaszDebita

Philip Holzmann commented

2018-03-11 16:31:48 +01:00

Added subscriber: @Foaly

Philip Holzmann commented

2018-03-11 16:31:48 +01:00

I can reproduce this.

I have simplified the scene. glitch.blend
Go into rendered preview. There is a black stripe on the bottom left corner of the object.
The stripe seems to get thicker the further the object is away from the origin. However the numbers seem to small for it to be a floating point inaccuracy.
The effect also gets stronger, when the Bounces Max is decreased.

I can reproduce this. I have simplified the scene. [glitch.blend](https://archive.blender.org/developer/F2434972/glitch.blend) Go into rendered preview. There is a black stripe on the bottom left corner of the object. The stripe seems to get thicker the further the object is away from the origin. However the numbers seem to small for it to be a floating point inaccuracy. The effect also gets stronger, when the Bounces Max is decreased.

Brecht Van Lommel commented

2018-03-15 02:48:41 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2018-03-15 02:48:41 +01:00

Changed status from 'Open' to: 'Archived'

Brecht Van Lommel closed this issue

2018-03-15 02:48:41 +01:00

Brecht Van Lommel self-assigned this 2018-03-15 02:48:41 +01:00

Brecht Van Lommel commented

2018-03-15 02:48:41 +01:00

Thanks for the report, this appears to be another variation of a known issue that we are trying to address in D1212 for example. Small features far away from the original are problematic for raytracing.

Thanks for the report, this appears to be another variation of a known issue that we are trying to address in [D1212](https://archive.blender.org/developer/D1212) for example. Small features far away from the original are problematic for raytracing.

Brecht Van Lommel commented

2018-03-15 02:50:35 +01:00

Closed as duplicate of #43835

Brecht Van Lommel closed this issue

2018-03-15 02:50:35 +01:00

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Blender Cycles Render make weird scratches on surface of objects when it's following path #54284