Inconsistency in a child's location relative to its parent's origin in Mesh vs Curve types. #100531

New Issue

Sleepy Star · 2022-08-21T06:27:22+02:00

Sleepy Star commented

2022-08-21 06:27:22 +02:00

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.78

Blender Version
Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: e05e1e3691
Worked: N/A

Short description of error
Inconsistency in a child's location relative to its parent's origin in Mesh vs Curve types.
A Mesh child's transform location is relative to its origin.
However, a Curve child's transform location is relative to splines- [x].points[0].

Expected behavior: both Mesh and Curve types behave the same.
Actual/Observed behavior: Setting a Cube's child.location to (0,0,0) goes to the Cube's center. However, Setting a Curve's child.location to (0,0,0) goes to splines- [x].points- [x] despite a different origin.

Exact steps for others to reproduce the error

Create a mesh Cube by using menu Add > Mesh > Cube.
Create an empty by using Add > Empty > Plain Axis
Parent empty to Cube, such that the empty is a child of the Cube.
Create a curve Circle by using Add > Curve > Nurbs Circle.
Create another empty by using Add > Empty > Plain Axis
Parent empty from step 5 to Circle, such that the empty is a child of the Circle.
Observe that the Cube's child empty is at the center of the Cube because its location is (0,0,0) relative to the Cube's origin.
Observe that the Circle's child empty is to the left of the Circle's origin. It is actually at splines- .points[0].
This is what we see:

LocationOfChildrenOfMeshAndCurve.blend

Expected behavior: both Mesh and Curve types behave the same, so that a child's location is relative to the origin, not a point making the points on the Curve. Like the picture below:

**System Information** Operating system: Windows-10-10.0.22000-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3060 Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 512.78 **Blender Version** Broken: version: 3.2.0, branch: master, commit date: 2022-06-08 10:22, hash: `e05e1e3691` Worked: N/A **Short description of error** Inconsistency in a child's location relative to its parent's origin in Mesh vs Curve types. A Mesh child's transform location is relative to its origin. However, a Curve child's transform location is relative to splines- [x].points[0]. Expected behavior: both Mesh and Curve types behave the same. Actual/Observed behavior: Setting a Cube's child.location to (0,0,0) goes to the Cube's center. However, Setting a Curve's child.location to (0,0,0) goes to splines- [x].points- [x] despite a different origin. **Exact steps for others to reproduce the error** 1. Create a mesh Cube by using menu Add > Mesh > Cube. 2. Create an empty by using Add > Empty > Plain Axis 3. Parent empty to Cube, such that the empty is a child of the Cube. 4. Create a curve Circle by using Add > Curve > Nurbs Circle. 5. Create another empty by using Add > Empty > Plain Axis 6. Parent empty from step 5 to Circle, such that the empty is a child of the Circle. 1. Observe that the Cube's child empty is at the center of the Cube because its location is (0,0,0) relative to the Cube's origin. 2. Observe that the Circle's child empty is to the left of the Circle's origin. It is actually at splines- [x].points[0]. This is what we see: ![image.png](https://archive.blender.org/developer/F13408940/image.png) [LocationOfChildrenOfMeshAndCurve.blend](https://archive.blender.org/developer/F13408948/LocationOfChildrenOfMeshAndCurve.blend) Expected behavior: both Mesh and Curve types behave the same, so that a child's location is relative to the origin, not a point making the points on the Curve. Like the picture below: ![image.png](https://archive.blender.org/developer/F13408949/image.png)

Sleepy Star commented

2022-08-21 06:27:22 +02:00

Added subscriber: @sleepystar96

Scurest commented

2022-08-21 11:36:32 +02:00

Added subscriber: @scurest

Pratik Borhade commented

2022-08-23 07:28:10 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-08-23 07:28:10 +02:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Pratik Borhade self-assigned this 2022-08-23 07:28:10 +02:00

Pratik Borhade commented

2022-08-23 07:28:10 +02:00

This happens if Path Animation is enabled for curve object. otherwise empty is parented to curve's center.
I'm not sure if this is working as expected or not. I'll investigate it later this week. Forwarding this report to developers for now

This happens if `Path Animation` is enabled for curve object. otherwise empty is parented to curve's center. I'm not sure if this is working as expected or not. I'll investigate it later this week. Forwarding this report to developers for now

Sleepy Star commented

2022-08-24 06:47:01 +02:00

Hey @PratikPB2123, you're right, disabling path animation makes the child follow origin again.

Perhaps this should be documented somewhere? I cannot find anything related on https://docs.blender.org/manual/en/latest/modeling/curves/properties/geometry.html. Sorry if I missed it.

Thank for the quick response!

Best,
sleepystar

Hey @PratikPB2123, you're right, disabling path animation makes the child follow origin again. Perhaps this should be documented somewhere? I cannot find anything related on https://docs.blender.org/manual/en/latest/modeling/curves/properties/geometry.html. Sorry if I missed it. Thank for the quick response! Best, sleepystar

Pratik Borhade removed their assignment 2022-12-29 05:02:28 +01:00

Philipp Oeser removed the

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Inconsistency in a child's location relative to its parent's origin in Mesh vs Curve types. #100531