Applying Scale to Curves is ignored by Bevel and Geometry settings #78568

New Issue

Andreas Resch · 2020-07-03T08:49:37+02:00

Andreas Resch commented

2020-07-03 08:49:37 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14

Blender Version
Broken: version: 2.83.1, branch: master, commit date: 2020-06-25 09:47, hash: 8289fc688b
Worked: (newest version of Blender that worked as expected)

Short description of error
When I import a curve (for example from Illustrator as SVG), scale it up and apply "Apply Scale" afterwards, everything looks fine in the size information. But when I change the setting for Depth, Extrude, Offset etc. in the Object Data Properties tab, the values are not correct and i seems as if the original scaling is applied on top of the actual value I was entering.

Exact steps for others to reproduce the error
*) Import some curve (for example as SVG)
*) Scale it up (let's say by 125)
*) "Apply Scale" to that curve so the scale values all show "1.000"
*) Go to the Object Data Properties tab and set the value for Extrude to 1 (in my case 1cm)
*) The height of the extruded curve is now 250cm (2cm * 125) instead of 2cm

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14 **Blender Version** Broken: version: 2.83.1, branch: master, commit date: 2020-06-25 09:47, hash: `8289fc688b` Worked: (newest version of Blender that worked as expected) **Short description of error** When I import a curve (for example from Illustrator as SVG), scale it up and apply "Apply Scale" afterwards, everything looks fine in the size information. But when I change the setting for Depth, Extrude, Offset etc. in the Object Data Properties tab, the values are not correct and i seems as if the original scaling is applied on top of the actual value I was entering. **Exact steps for others to reproduce the error** *) Import some curve (for example as SVG) *) Scale it up (let's say by 125) *) "Apply Scale" to that curve so the scale values all show "1.000" *) Go to the Object Data Properties tab and set the value for Extrude to 1 (in my case 1cm) *) The height of the extruded curve is now 250cm (2cm * 125) instead of 2cm

Andreas Resch commented

2020-07-03 08:49:37 +02:00

Added subscriber: @AndreasResch

Germano Cavalcante commented

2020-07-07 15:25:43 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-07-07 15:25:43 +02:00

Can you provide the .svg file or the .blend file itself with the imported curve?

Andreas Resch commented

2020-07-07 15:32:58 +02:00

Here's a simple circle exported by Illustrator. You'll have to scale it by 125 to get to the scale from Illustrator.

Here's a simple circle exported by Illustrator. You'll have to scale it by 125 to get to the scale from Illustrator.![Circle_2cm_Normal.svg](https://archive.blender.org/developer/F8675571/Circle_2cm_Normal.svg)

Germano Cavalcante commented

2020-07-07 15:50:56 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Germano Cavalcante closed this issue

2020-07-07 15:50:56 +02:00

Germano Cavalcante self-assigned this 2020-07-07 15:50:56 +02:00

Germano Cavalcante commented

2020-07-07 15:50:56 +02:00

Thanks for the report, but there is no bug here.
Extrude is a property that depends on the normal of each point.
This is to allow effects like this:

You can view the normal when the curve is 3D. and the "Normals" option is enabled in the viewport overlay.

Thanks for the report, but there is no bug here. Extrude is a property that depends on the normal of each point. This is to allow effects like this: ![image.png](https://archive.blender.org/developer/F8675590/image.png) You can view the normal when the curve is 3D. and the "Normals" option is enabled in the viewport overlay.

Andreas Resch commented

2020-07-07 16:07:48 +02:00

What do the normals have to do with the scale issue? Is there a scale assigned to the normals? And how can I display the normals for a curve object?

How can this be explained via normals?

What do the normals have to do with the scale issue? Is there a scale assigned to the normals? And how can I display the normals for a curve object? How can this be explained via normals? ![Units_03.jpg](https://archive.blender.org/developer/F8675617/Units_03.jpg)

Germano Cavalcante commented

2020-07-07 16:21:06 +02:00

The overlay panel is called "normal", but the transform panel is called "radius":
https://docs.blender.org/manual/en/latest/modeling/curves/editing/curve.html#radius

The overlay panel is called "normal", but the transform panel is called "radius": https://docs.blender.org/manual/en/latest/modeling/curves/editing/curve.html#radius

Andreas Resch commented

2020-07-07 16:27:39 +02:00

So the question is, why does "Apply Scale" on a curve change the value of "Mean Radius"?

Germano Cavalcante commented

2020-07-07 16:36:29 +02:00

This has been the case since the original code. And if changed, it would affect many users.

In my opinion it is reasonable to apply the scale value for the radius as well. This keeps the generated geometry equal before and after being applied.

If the radius value was not changed/applied, the observable value of the extrude or bevel would change in the generated geometry.

Many would think that this is a bug.

This has been the case since the original code. And if changed, it would affect many users. In my opinion it is reasonable to apply the scale value for the radius as well. This keeps the generated geometry equal before and after being applied. If the radius value was not changed/applied, the observable value of the extrude or bevel would change in the generated geometry. Many would think that this is a bug.

Andreas Resch commented

2020-07-07 17:04:41 +02:00

This logic may apply when you fiddle with a curve and then scale it. But if you scale the curve first and start to work on it after that, everything falls apart and the values for Extrude, Offset etc. are meaningless. Unless you go into Edit Mode, set the "Mean Radius" to 1 and start working on the curve afterwards.

And there's another issue. Let's say I have changed the "Mean Radius" values to nice numbers like "1", "2", "0.5" etc. because I've set them numerically considering some proportions. If I scale the curve by let's say "2.654434" (cause I did it visually) and use "Apply Scale" afterwards, those "Mean Radius" values are all messed up and changing them in relation to each other becomes really hard.

So overall I don't think that the "Mean Radius" values should never be messed with from outside as they represent proportional values with "1" being "normal". When I scale the curve by 10 and use "Apply Scale", suddenly "10" is "normal" (plus the values for Extrude, Offset etc. are not really representative any more.

From a logical standpoint, this isn't a very elegant solution. But if you don't want to mess with old decisions, then that's that.

This logic may apply when you fiddle with a curve and then scale it. But if you scale the curve first and start to work on it after that, everything falls apart and the values for Extrude, Offset etc. are meaningless. Unless you go into Edit Mode, set the "Mean Radius" to 1 and start working on the curve afterwards. And there's another issue. Let's say I have changed the "Mean Radius" values to nice numbers like "1", "2", "0.5" etc. because I've set them numerically considering some proportions. If I scale the curve by let's say "2.654434" (cause I did it visually) and use "Apply Scale" afterwards, those "Mean Radius" values are all messed up and changing them in relation to each other becomes really hard. So overall I don't think that the "Mean Radius" values should never be messed with from outside as they represent proportional values with "1" being "normal". When I scale the curve by 10 and use "Apply Scale", suddenly "10" is "normal" (plus the values for Extrude, Offset etc. are not really representative any more. From a logical standpoint, this isn't a very elegant solution. But if you don't want to mess with old decisions, then that's that.

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Applying Scale to Curves is ignored by Bevel and Geometry settings #78568