Wrong Deformation when using Curve Modifier #71691

New Issue

Telmo Silva · 2019-11-19T21:57:26+01:00

Telmo Silva commented

2019-11-19 21:57:26 +01:00

System Information
Operating system: Linux-5.3.11-300.fc31.x86_64-x86_64-with-fedora-31-Thirty_One 64 Bits
Graphics card: Mesa DRI Intel(R) HD Graphics 620 (Kaby Lake GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 19.2.4

Blender Version
Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-18 12:53, hash: 115a5bf65a
Worked: (optional)

Short description of error
Using a curve modifier on an object, using a scaled ( and applied ) curve, results in a wrong deformation.

Exact steps for others to reproduce the error

Create a curve
Create a Cube
Resize curve and apply transformation
Add Curve Modifier to Cube

Below is a screenshot with different scenarios of curve modifier use.

**System Information** Operating system: Linux-5.3.11-300.fc31.x86_64-x86_64-with-fedora-31-Thirty_One 64 Bits Graphics card: Mesa DRI Intel(R) HD Graphics 620 (Kaby Lake GT2) Intel Open Source Technology Center 4.5 (Core Profile) Mesa 19.2.4 **Blender Version** Broken: version: 2.81 (sub 16), branch: master, commit date: 2019-11-18 12:53, hash: `115a5bf65a` Worked: (optional) **Short description of error** Using a curve modifier on an object, using a scaled ( and applied ) curve, results in a wrong deformation. **Exact steps for others to reproduce the error** 1. Create a curve 2. Create a Cube 3. Resize curve and apply transformation 4. Add Curve Modifier to Cube Below is a screenshot with different scenarios of curve modifier use. ![Screenshot from 2019-11-19 21-52-41.png](https://archive.blender.org/developer/F8145004/Screenshot_from_2019-11-19_21-52-41.png)

Telmo Silva commented

2019-11-19 21:57:26 +01:00

Added subscriber: @nottelmo-4

blender-admin commented

2019-11-19 21:57:26 +01:00

#72149 was marked as duplicate of this issue

Stanislav Blinov commented

2019-11-19 22:03:43 +01:00

Added subscriber: @Stan_Pancakes

Stanislav Blinov commented

2019-11-19 22:03:43 +01:00

When you apply scale on the curve, the radius of control points is changed. That radius influences deformation of the object. So if required, you can select control points of the curve and set their radius back to 1.

Vladimir Spivak commented

2019-11-19 22:19:43 +01:00

Added subscriber: @cwolf3d

Vladimir Spivak commented

2019-11-19 22:19:43 +01:00

Try the scale reset function from the curve tools addon. It works differently than the built-in one.

Telmo Silva commented

2019-11-19 22:35:22 +01:00

In #71691#813332, @Stan_Pancakes wrote:
When you apply scale on the curve, the radius of control points is changed. That radius influences deformation of the object. So if required, you can select control points of the curve and set their radius back to 1.

Okay but, that being the default behavior is not intuitive. I think it makes sense that the radius of control points should also be changed along an apply scale transformation

> In #71691#813332, @Stan_Pancakes wrote: > When you apply scale on the curve, the radius of control points is changed. That radius influences deformation of the object. So if required, you can select control points of the curve and set their radius back to 1. Okay but, that being the default behavior is not intuitive. I think it makes sense that the radius of control points should also be changed along an apply scale transformation

Philipp Oeser commented

2019-11-20 10:27:01 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2019-11-20 10:27:01 +01:00

Changed status from 'Open' to: 'Archived'

Philipp Oeser closed this issue

2019-11-20 10:27:01 +01:00

Philipp Oeser self-assigned this 2019-11-20 10:27:01 +01:00

Philipp Oeser commented

2019-11-20 10:27:01 +01:00

In #71691#813351, @nottelmo-4 wrote:

In #71691#813332, @Stan_Pancakes wrote:
When you apply scale on the curve, the radius of control points is changed. That radius influences deformation of the object. So if required, you can select control points of the curve and set their radius back to 1.

Okay but, that being the default behavior is not intuitive. I think it makes sense that the radius of control points should also be changed along an apply scale transformation

The radius is changed when you apply scale, like @Stan_Pancakes said. [main reason is to preserve look of bevels I guess]
Have a look at Curve Tools Addon, as @cwolf3d , said, this is what you are after.

Anyways, this works as intended, dont see a bug here, closing
(@nottelmo-4: feel free though to comment again if issues persist...)

> In #71691#813351, @nottelmo-4 wrote: >> In #71691#813332, @Stan_Pancakes wrote: >> When you apply scale on the curve, the radius of control points is changed. That radius influences deformation of the object. So if required, you can select control points of the curve and set their radius back to 1. > > Okay but, that being the default behavior is not intuitive. I think it makes sense that the radius of control points should also be changed along an apply scale transformation The radius **is** changed when you apply scale, like @Stan_Pancakes said. [main reason is to preserve look of bevels I guess] Have a look at Curve Tools Addon, as @cwolf3d , said, this is what you are after. Anyways, this works as intended, dont see a bug here, closing (@nottelmo-4: feel free though to comment again if issues persist...)

Philipp Oeser commented

2019-12-05 09:47:30 +01:00

Added subscriber: @massey

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Wrong Deformation when using Curve Modifier #71691