Screw modifier bug: Cycles render preview different from final render result #62857

New Issue

Christoph Werner · 2019-03-22T19:19:56+01:00

Christoph Werner commented

2019-03-22 19:19:56 +01:00

System Information
Operating system: Windows 10 Pro 64
Graphics card: GeForce GTX 1080 Ti

Blender Version
Broken: blender-2.80-1ae6aaad43ad-win64 (Same issue in blender-2.79-d7cecc2ba3f6-win64)
Worked: -

Short description of error
See my screenshot / Attached scene file.

Viewport render preview looks nice.
On the left hand you see the final render result.
Only solution to see a correct final render is to apply the screw modifier in the stack of the "Bottle cap" object.

Further note: I've observed same problems with screw modifier and reflections in the same scene.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file.

Open the file.
Right hand viewport: Switch to "rendered view" mode. Cycles begin to render.
Press F12 now, to see the final render on the left hand side.

Compare the results. The Bottle glass in the final render on left hand is wrong. Only solution for a correct final rendering is to apply the screw modifier in the stack of the "Bottle cap" object.

blender_screw_bug.blend

**System Information** Operating system: Windows 10 Pro 64 Graphics card: GeForce GTX 1080 Ti **Blender Version** Broken: blender-2.80-1ae6aaad43ad-win64 (Same issue in blender-2.79-d7cecc2ba3f6-win64) Worked: - **Short description of error** See my screenshot / Attached scene file. 1. Viewport render preview looks nice. 2. On the left hand you see the final render result. 3. Only solution to see a correct final render is to apply the screw modifier in the stack of the "Bottle cap" object. Further note: I've observed same problems with screw modifier and reflections in the same scene. **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file. 1. Open the file. 2. Right hand viewport: Switch to "rendered view" mode. Cycles begin to render. 3. Press F12 now, to see the final render on the left hand side. - > Compare the results. The Bottle glass in the final render on left hand is wrong. Only solution for a correct final rendering is to apply the screw modifier in the stack of the "Bottle cap" object. [blender_screw_bug.blend](https://archive.blender.org/developer/F6866331/blender_screw_bug.blend) ![blender_bug_screw.JPG](https://archive.blender.org/developer/F6866354/blender_bug_screw.JPG)

Christoph Werner commented

2019-03-22 19:19:56 +01:00

Added subscriber: @ChristophWerner

William Reynish commented

2019-03-22 19:30:00 +01:00

Added subscriber: @WilliamReynish

William Reynish commented

2019-03-22 19:30:00 +01:00

Changed status from 'Open' to: 'Archived'

William Reynish closed this issue

2019-03-22 19:30:00 +01:00

William Reynish self-assigned this 2019-03-22 19:30:00 +01:00

William Reynish commented

2019-03-22 19:30:00 +01:00

This doesn't appear to be a bug. Your Screw Modifier Render Steps are simply lower than the regular Steps.

Christoph Werner commented

2019-03-22 21:03:03 +01:00

No. That's not the reason. I've already checked it. I know the screw modifier well.

Even if you increase the render steps there's no difference.

Thank you

No. That's not the reason. I've already checked it. I know the screw modifier well. Even if you increase the render steps there's no difference. Thank you

Christoph Werner commented

2019-03-22 21:09:59 +01:00

Plase wait with tests. I'll check my origin file and give feedback.

Christoph Werner commented

2019-03-22 21:14:09 +01:00

In #62857#646513, @WilliamReynish wrote:
This doesn't appear to be a bug. Your Screw Modifier Render Steps are simply lower than the regular Steps.

You're right.

I'm so sorry. I was sure it was a bug. I've completey overlooked this. (Maybe too tired......) Actually I know Blender...

Excuse my post. I'll close this issue.

> In #62857#646513, @WilliamReynish wrote: > This doesn't appear to be a bug. Your Screw Modifier Render Steps are simply lower than the regular Steps. You're right. I'm so sorry. I was sure it was a bug. I've completey overlooked this. (Maybe too tired......) Actually I know Blender... Excuse my post. I'll close this issue.

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Screw modifier bug: Cycles render preview different from final render result #62857