bezier curve extrusion seems to be wrong after applying scale. #34533

New Issue

Alexander N. · 2013-03-05T07:50:23+01:00

Alexander N. commented

2013-03-05 07:50:23 +01:00

%%%--- Operating System, Graphics card ---
Windows 7 SP1 64bit,

- Blender version with error, and version that worked ---

blender-2.66-windows64.7z - with issues

- Short description of error ---

i don't know, if that is a bug,
but when i scale a curve and apply its scale, so that the scale is set to 1 without reducing the dimension of the curve, after that, when i enter a value in the extrude field, it seems that this value will remember its previous scale.
(Curve.extrude / bpy.data.curves['...'].extrude)

- Steps for others to reproduce the error (preferably based on attached .blend file) ---

see attached .blend file, there are four bezier circles.

BezierCircle.1:
1. default BezierCircle without any scale.
2. exturde by 1 unit, extrudes the circle by 1 unit.

BezierCircle.s3:
1. default BezierCircle with scale of 3 units on object level.
2. exturde by 1 unit, extrudes the circle by 3 unit.

  (this is what i expected)

BezierCircle.s3as:
1. default BezierCircle with scale of 3 units on object level and applied scale.
2. exturde by 1 unit, extrudes the circle by 3 unit.

  (this looks wrong to me, the extrusion should be 1 unit, because i applied the scale before i added an extrusion of 1)

BezierCircle.es3:
1. default BezierCircle with scale of 3 units in edit mode.
2. exturde by 1 unit, extrudes the circle by 1 unit.

  (this is what i expected)

%%%

%%%--- Operating System, Graphics card --- Windows 7 SP1 64bit, - Blender version with error, and version that worked --- blender-2.66-windows64.7z - with issues - Short description of error --- i don't know, if that is a bug, but when i scale a curve and apply its scale, so that the scale is set to 1 without reducing the dimension of the curve, after that, when i enter a value in the extrude field, it seems that this value will remember its previous scale. (Curve.extrude / bpy.data.curves['...'].extrude) - Steps for others to reproduce the error (preferably based on attached .blend file) --- see attached .blend file, there are four bezier circles. BezierCircle.1: 1. default BezierCircle without any scale. 2. exturde by 1 unit, extrudes the circle by 1 unit. BezierCircle.s3: 1. default BezierCircle with scale of 3 units on object level. 2. exturde by 1 unit, extrudes the circle by 3 unit. ``` (this is what i expected) ``` BezierCircle.s3as: 1. default BezierCircle with scale of 3 units on object level and applied scale. 2. exturde by 1 unit, extrudes the circle by 3 unit. ``` (this looks wrong to me, the extrusion should be 1 unit, because i applied the scale before i added an extrusion of 1) ``` BezierCircle.es3: 1. default BezierCircle with scale of 3 units in edit mode. 2. exturde by 1 unit, extrudes the circle by 1 unit. ``` (this is what i expected) ``` %%%

Alexander N. commented

2013-03-05 07:50:23 +01:00

Changed status to: 'Open'

blender-admin commented

2013-03-05 07:50:23 +01:00

#82706 was marked as duplicate of this issue

Sergey Sharybin commented

2013-03-05 08:55:54 +01:00

%%%Amount of extrusion is actually Extrusion * Curve Radius. When you apply scale on a curve, it's radius is getting scaled as well. This is needed to preserve shape when you're using bevel object and affecting on shape using radius.

This is like two conflicting things -- preserve exact shape of object when applying transformations (which is currently what we do) and as in your case preserving units behaving as in pre-scaled object.

IMO, preserving shape is more important and once you've understand what apply transformation is doing exactly, it's easy to correct values so you could continue modelling.

Thanks for the report, but would not consider this is bug.%%%

%%%Amount of extrusion is actually Extrusion * Curve Radius. When you apply scale on a curve, it's radius is getting scaled as well. This is needed to preserve shape when you're using bevel object and affecting on shape using radius. This is like two conflicting things -- preserve exact shape of object when applying transformations (which is currently what we do) and as in your case preserving units behaving as in pre-scaled object. IMO, preserving shape is more important and once you've understand what apply transformation is doing exactly, it's easy to correct values so you could continue modelling. Thanks for the report, but would not consider this is bug.%%%

Sergey Sharybin commented

2013-03-05 08:55:54 +01:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2013-03-05 08:55:54 +01:00

Alexander N. commented

2013-03-05 12:43:33 +01:00

%%%ok, this this knowledge i can live.
i did not realize that in this case the radius has an other value and controls the extrusion.
thanks for clarify.%%%

%%%ok, this this knowledge i can live. i did not realize that in this case the radius has an other value and controls the extrusion. thanks for clarify.%%%

Richard Antalik commented

2020-11-16 08:54:55 +01:00

Added subscribers: @RobertS, @EAW, @iss

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bezier curve extrusion seems to be wrong after applying scale. #34533