Bug on depsgraph #85482

New Issue

wenye he · 2021-02-09T05:50:11+01:00

wenye he commented

2021-02-09 05:50:11 +01:00

System Information
Operating system: Windows 10
Graphics card: GTX1060 6GB

Blender Version
Blender 2.91

Short description of error
I think it is a bug in depsgraph causes the wrong result... Or I made some mistakes in using depsgraph
I am writing a function to convert a NURBS curve into a poly curve. Each edge has the same length along z-axis.
For example, the curve's z-dimension is 12 meters. The curve is composed of 11 points and 10 edges. pt0.z = 0, pt1.z = 1.2, pt3.z = 2.4, ..., pt11.z = 12.
I use bmesh.ops.bisect_plane to help me.

I attach the file with the script. If I run getUniformCurveOnZ alone in the script, it is OK. However, if I want to run getUniformCurveOnZ for different objects in one execution, I have a high chance to get the wrong result.
The number of control points in NURBS may influence the result.

Exact steps for others to reproduce the error
The attached blend files, bugreport.blend includes the running result, while bugreportwithoutresult.blend doesn't.
Run the script directly in bugreportwithoutresult.blend to get the same result as shown inbugreport.blend.

Test one SpineCenterline works.
Test two SpineCenterlines give the wrong result.

You can copy my scripts and create your NURBS curves in your blender file. Just need to ensure the curve is not parallel to xy-plane.
One more thing, you can print the return vert at the end of getUniformCurveOnZ and after getUniformCurveOnZ. I don't know why they are different in SpineCenterline1.

**System Information** Operating system: Windows 10 Graphics card: GTX1060 6GB **Blender Version** Blender 2.91 **Short description of error** I think it is a bug in depsgraph causes the wrong result... Or I made some mistakes in using depsgraph I am writing a function to convert a NURBS curve into a poly curve. Each edge has the same length along z-axis. For example, the curve's z-dimension is 12 meters. The curve is composed of 11 points and 10 edges. pt0.z = 0, pt1.z = 1.2, pt3.z = 2.4, ..., pt11.z = 12. I use bmesh.ops.bisect_plane to help me. I attach the file with the script. If I run getUniformCurveOnZ alone in the script, it is OK. However, if I want to run getUniformCurveOnZ for different objects in one execution, I have a high chance to get the wrong result. The number of control points in NURBS may influence the result. **Exact steps for others to reproduce the error** The attached blend files, [bugreport.blend](https://archive.blender.org/developer/F9742151/bugreport.blend) includes the running result, while [bugreportwithoutresult.blend](https://archive.blender.org/developer/F9742036/bugreportwithoutresult.blend) doesn't. Run the script directly in **bugreportwithoutresult.blend** to get the same result as shown in**bugreport.blend.** Test one SpineCenterline works. Test two SpineCenterlines give the wrong result. You can copy my scripts and create your NURBS curves in your blender file. Just need to ensure the curve is not parallel to xy-plane. One more thing, you can print the return vert at the end of getUniformCurveOnZ and after getUniformCurveOnZ. I don't know why they are different in **SpineCenterline1**.

wenye he commented

2021-02-09 05:50:11 +01:00

Added subscriber: @WenyeHe

Philipp Oeser commented

2021-03-04 11:02:44 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-03-04 11:02:44 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Philipp Oeser commented

2021-03-04 11:02:44 +01:00

Cannot reproduce here (tested in both 2.91 and current 2.93)

Always getting the (seemingly) correct result:

Just to make sure:

Is this still an issue in 2.93 Alpha build from https://builder.blender.org/download/?

I have a high chance to get the wrong result

Does this mean sometimes results are correct, sometimes they are not?

Cannot reproduce here (tested in both 2.91 and current 2.93) Always getting the (seemingly) correct result: ![image.png](https://archive.blender.org/developer/F9865345/image.png) Just to make sure: - Is this still an issue in 2.93 Alpha build from https://builder.blender.org/download/? > I have a high chance to get the wrong result Does this mean sometimes results are correct, sometimes they are not?

Philipp Oeser commented

2021-03-24 15:28:57 +01:00

Changed status from 'Needs User Info' to: 'Archived'

Philipp Oeser closed this issue

2021-03-24 15:28:57 +01:00

Philipp Oeser commented

2021-03-24 15:28:57 +01:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

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Bug on depsgraph #85482