Result from using curve taper/bevel objects not scaled properly when used in scene with 0.01 metric scene scale #51666

New Issue

Henrik Berglund · 2017-05-30T16:00:08+02:00

Henrik Berglund commented

2017-05-30 16:00:08 +02:00

System Information
Win8, GTX1070

Blender Version
Broken: 2.78 e92f235283 and recent 2.78 builds too

Short description of error
When selecting a taper object and a bevel object for a bezier curve in a scene with 0.01 metric scene scale it turns into a huge mess. I'm guessing it has something to do with the scale of the bevel object because if you scale it down 100 times the curve looks normal.

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps
Expected result: (in scene with 1 metric scene scale)

Create two bezier curves and a bezier circle.
Select one of the bezier curves, select the other bezier curve as a taper object, the circle as a bevel object.
You end up with a small blob.

Not expected result: (in scene with 0.01 metric scene scale)

Create two bezier curves and a bezier circle.
Select one of the bezier curves, select the other bezier curve as a taper object, the circle as a bevel object.
You end up with a huge cylinder looking thing.
Scale down the bevel object to 0.01 scale, things look normal again.

.blend file: bug_curve_scene_scale_001.blend

**System Information** Win8, GTX1070 **Blender Version** Broken: 2.78 e92f235283 and recent 2.78 builds too **Short description of error** When selecting a taper object and a bevel object for a bezier curve in a scene with 0.01 metric scene scale it turns into a huge mess. I'm guessing it has something to do with the scale of the bevel object because if you scale it down 100 times the curve looks normal. **Exact steps for others to reproduce the error** Based on a (as simple as possible) attached .blend file with minimum amount of steps Expected result: (in scene with 1 metric scene scale) 1. Create two bezier curves and a bezier circle. 2. Select one of the bezier curves, select the other bezier curve as a taper object, the circle as a bevel object. 3. You end up with a small blob. Not expected result: (in scene with 0.01 metric scene scale) 1. Create two bezier curves and a bezier circle. 2. Select one of the bezier curves, select the other bezier curve as a taper object, the circle as a bevel object. 3. You end up with a huge cylinder looking thing. 4. Scale down the bevel object to 0.01 scale, things look normal again. .blend file: [bug_curve_scene_scale_001.blend](https://archive.blender.org/developer/F613064/bug_curve_scene_scale_001.blend)

Henrik Berglund commented

2017-05-30 16:00:08 +02:00

Changed status to: 'Open'

Henrik Berglund commented

2017-05-30 16:00:08 +02:00

Added subscriber: @cyaoeu

Sergey Sharybin commented

2017-06-02 11:26:12 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2017-06-02 11:26:12 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2017-06-02 11:26:12 +02:00

Sergey Sharybin self-assigned this 2017-06-02 11:26:12 +02:00

Sergey Sharybin commented

2017-06-02 11:26:12 +02:00

This is how taper works -- it multiplies the bevel by a Y coordinate (in local object space) of point of curve used for taper. In your case thay Y coordinate goes up to about 24. This what makes your curve to look really big.

Thanks for the report, but it's not a bug. Maybe improvements are possible here, but those happens outside of the bug tracking process.

This is how taper works -- it multiplies the bevel by a Y coordinate (in local object space) of point of curve used for taper. In your case thay Y coordinate goes up to about 24. This what makes your curve to look really big. Thanks for the report, but it's not a bug. Maybe improvements are possible here, but those happens outside of the bug tracking process.

Henrik Berglund commented

2017-06-02 12:30:18 +02:00

It doesn't make sense. The dimensions for the objects are the same in a scene with 1 scale or 0.01 scale, so why would the result be different?

If repeat the above process in a scene with 1 metric unit scale it looks fine. So why is it broken in 0.01 unit scale?

It doesn't make sense. The dimensions for the objects are the same in a scene with 1 scale or 0.01 scale, so why would the result be different? If repeat the above process in a scene with 1 metric unit scale it looks fine. So why is it broken in 0.01 unit scale?

Sergey Sharybin commented

2017-06-02 12:37:35 +02:00

Unit system and scale factor is purely interface thing, which scales internal values by given scale factor and appends unit. This also affects the grid. But internally everything is stored and processed in Blender Units.

You can see the exact blender values if you set units to None and units scale to 1. Those would be the values Blender is operating with internally.

Unit system and scale factor is purely interface thing, which scales internal values by given scale factor and appends unit. This also affects the grid. But internally everything is stored and processed in Blender Units. You can see the exact blender values if you set units to None and units scale to 1. Those would be the values Blender is operating with internally.

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Result from using curve taper/bevel objects not scaled properly when used in scene with 0.01 metric scene scale #51666