Parenting to curve object makes curve vertice location (in edit mode) alter location of the meshes #105276

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opened 2023-02-28 03:06:12 +01:00 by Gabriel Moro · 3 comments

Gabriel Moro commented

2023-02-28 03:06:12 +01:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 528.24

Blender Version
Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: rB55485cb379f7
Worked: (newest version of Blender that worked as expected)

Short description of error
This is not a major bug but changing the position of the curve in edit mode changes the position of the mesh parented to the curve object.

Exact steps for others to reproduce the error
Get in edit mode and move the vertice. And move the whole curve outside edit mode too.

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 4090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 528.24 **Blender Version** Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: `rB55485cb379f7` Worked: (newest version of Blender that worked as expected) **Short description of error** This is not a major bug but changing the position of the curve in edit mode changes the position of the mesh parented to the curve object. **Exact steps for others to reproduce the error** Get in edit mode and move the vertice. And move the whole curve outside edit mode too.

Blender_ [C__Users_NPC Tech_OneDrive_Área de Trabalho_Parent Curve Bug.blend] 2023-02-27 17-55-48.mp4

4.2 MiB

Parent Curve Bug.blend

2.8 MiB

Gabriel Moro added the

labels 2023-02-28 03:06:13 +01:00

Iliya Katushenock commented

2023-02-28 06:15:24 +01:00

Member

This is not a regression... although I haven't heard of this behavior, it doesn't seem like a bug.

This is not a regression... although I haven't heard of this behavior, it doesn't seem like a bug.

Iliya Katushenock added the

label 2023-02-28 06:15:33 +01:00

Gabriel Moro commented

2023-02-28 10:39:00 +01:00

Author

Shouldn’t the parenting in this case only take into account the main loc/rot/scale from the parent object? In this case I added screws to a cable and parented it (to the curve object), so I believe it shouldn’t move when editing the curve points (I’m just assuming)..?

Shouldn’t the parenting in this case only take into account the main loc/rot/scale from the parent object? In this case I added screws to a cable and parented it (to the curve object), so I believe it shouldn’t move when editing the curve points (I’m just assuming)..?

Philipp Oeser commented

2023-02-28 15:23:07 +01:00

Member

This is caused by a combination of two things:

the curve has Path Animation turned ON (see https://docs.blender.org/manual/en/3.5/modeling/curves/properties/path_animation.html)
parent relationship was set up with a parent inverse (see https://docs.blender.org/manual/en/3.5/scene_layout/object/editing/parent.html#parent-inverse)

So to set this up properly (or to correct the setup in the file), you can do the following:

select Hex Stopper.004
Object > Parent > Clear and Keep Transformation
do the same with the other bolts
disable Path Animation on BezierCurve.079
select Hex Stopper.004 again, then BezierCurve.159
CTRL + P > Set Parent to Object (Keep Transform without Inverse)
do the same with the other bolts

Now we have a parent relationship without transforms or settings messing with the behavior of curve editmode

you can still move the whole curve object and the bolts move along
you can move any curve point in editmode (including first and last) with expected behavior

Parent Inverse and Path Animation are sometimes a bit hard to grasp, still think there is no bug here, will close.
(but of course feel free to comment again if issues persist)

This is caused by a combination of two things: - the curve has Path Animation turned ON (see https://docs.blender.org/manual/en/3.5/modeling/curves/properties/path_animation.html) - parent relationship was set up with a parent inverse (see https://docs.blender.org/manual/en/3.5/scene_layout/object/editing/parent.html#parent-inverse) So to set this up properly (or to correct the setup in the file), you can do the following: - select `Hex Stopper.004` - `Object` > `Parent` > `Clear and Keep Transformation` - do the same with the other bolts - disable `Path Animation` on `BezierCurve.079` - select `Hex Stopper.004` again, then `BezierCurve.159` - `CTRL + P` > Set Parent to `Object (Keep Transform without Inverse)` - do the same with the other bolts Now we have a parent relationship without transforms or settings messing with the behavior of curve editmode - you can still move the whole curve object and the bolts move along - you can move any curve point in editmode (including first and last) with expected behavior Parent Inverse and Path Animation are sometimes a bit hard to grasp, still think there is no bug here, will close. (but of course feel free to comment again if issues persist)

Parent Curve Bug corrected.blend

2.7 MiB

Philipp Oeser closed this issue

2023-02-28 15:23:33 +01:00

Blender Bot added

and removed

labels 2023-02-28 15:23:34 +01:00

Philipp Oeser referenced this issue

2023-02-28 16:03:41 +01:00

UI: add parenting (Keep Transform Without Inverse) to menu #105301

Sybren A. Stüvel referenced this issue from a commit

2023-03-07 15:14:11 +01:00

UI: add parenting (Keep Transform Without Inverse) to menu

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