Origin Offset: Simple Deform modifier (Bend) #42574

New Issue

Leon Cheung · 2014-11-12T02:04:26+01:00

Leon Cheung commented

2014-11-12 02:04:26 +01:00

System Information
Win8.1 64bit | GTX680

Blender Version
Broken: 2.72.2 0627bc2

Short description of error
Unlike other type (Twist, Taper and Stretch), The Origin of Bend seems not behave as its expected origin / center.

Exact steps for others to reproduce the error

Please see attached demo.

bend_test.blend

Thanks.

**System Information** Win8.1 64bit | GTX680 **Blender Version** Broken: 2.72.2 0627bc2 **Short description of error** Unlike other type (Twist, Taper and Stretch), The Origin of **Bend** seems not behave as its expected origin / center. **Exact steps for others to reproduce the error** Please see attached demo. ![bend_origin.jpg](https://archive.blender.org/developer/F123370/bend_origin.jpg) [bend_test.blend](https://archive.blender.org/developer/F123372/bend_test.blend) Thanks.

Leon Cheung commented

2014-11-12 02:04:26 +01:00

Changed status to: 'Open'

Leon Cheung commented

2014-11-12 02:04:26 +01:00

Added subscriber: @ZhangYu

Campbell Barton was assigned by Lukas Tönne

2014-11-12 11:02:05 +01:00

Lukas Tönne commented

2014-11-12 11:02:05 +01:00

Added subscribers: @ideasman42, @LukasTonne

Lukas Tönne commented

2014-11-12 11:02:05 +01:00

@ideasman42: Do you know how this thing is supposed to work? I can't say what the correct behavior would be, the math looks correct ...

Aaron Carlisle commented

2014-11-12 22:17:18 +01:00

Added subscriber: @Blendify

Aaron Carlisle commented

2014-11-12 22:17:18 +01:00

Considering that this is a test build please try to test this in Blender 2.72b

Aaron Carlisle commented

2014-11-12 22:18:17 +01:00

Adding myself

Leon Cheung commented

2014-11-13 08:25:15 +01:00

OK. Now I think it is something about the algorithm, which at least works since 2.4x. So I admit that this may not be a real bug. The Origin is just a offset, not a "center".

bend_test2.blend

OK. Now I think it is something about the algorithm, which at least works since 2.4x. So I admit that this may not be a real bug. The **Origin** is just a offset, not a "center". [bend_test2.blend](https://archive.blender.org/developer/F123585/bend_test2.blend) ![compare.jpg](https://archive.blender.org/developer/F123586/compare.jpg) ![249.jpg](https://archive.blender.org/developer/F123589/249.jpg)

Aaron Carlisle commented

2014-11-13 21:02:04 +01:00

Is the Origin point of your mesh in the center?

Aaron Carlisle commented

2014-11-13 21:15:03 +01:00

I don't no too much about c however he is the file that i believe that the modifier is in rna_modifier.c

static void rna_def_modifier_simpledeform(BlenderRNA *brna)
{
	StructRNA *srna;
	PropertyRNA *prop;

	static EnumPropertyItem simple_deform_mode_items[] = {
		{MOD_SIMPLEDEFORM_MODE_TWIST, "TWIST", 0, "Twist", "Rotate around the Z axis of the modifier space"},
		{MOD_SIMPLEDEFORM_MODE_BEND, "BEND", 0, "Bend", "Bend the mesh over the Z axis of the modifier space"},
		{MOD_SIMPLEDEFORM_MODE_TAPER, "TAPER", 0, "Taper", "Linearly scale along Z axis of the modifier space"},
		{MOD_SIMPLEDEFORM_MODE_STRETCH, "STRETCH", 0, "Stretch",
		                                "Stretch the object along the Z axis of the modifier space"},
		{0, NULL, 0, NULL, NULL}
	};

I don't no too much about c however he is the file that i believe that the modifier is in [rna_modifier.c](https://archive.blender.org/developer/F123673/rna_modifier.c) ``` static void rna_def_modifier_simpledeform(BlenderRNA *brna) { StructRNA *srna; PropertyRNA *prop; static EnumPropertyItem simple_deform_mode_items[] = { {MOD_SIMPLEDEFORM_MODE_TWIST, "TWIST", 0, "Twist", "Rotate around the Z axis of the modifier space"}, {MOD_SIMPLEDEFORM_MODE_BEND, "BEND", 0, "Bend", "Bend the mesh over the Z axis of the modifier space"}, {MOD_SIMPLEDEFORM_MODE_TAPER, "TAPER", 0, "Taper", "Linearly scale along Z axis of the modifier space"}, {MOD_SIMPLEDEFORM_MODE_STRETCH, "STRETCH", 0, "Stretch", "Stretch the object along the Z axis of the modifier space"}, {0, NULL, 0, NULL, NULL} }; ```

Aaron Carlisle commented

2014-11-13 21:33:52 +01:00

Okay I agree with you I Believe it is the algorithm

A moved the origin point of the modify to give it more of an effect then applied the modifier. Sub dividing one of the surfaces I can see that it is off.

Okay I agree with you I Believe it is the algorithm A moved the origin point of the modify to give it more of an effect then applied the modifier. Sub dividing one of the surfaces I can see that it is off. ![OFF.png](https://archive.blender.org/developer/F123676/OFF.png)

Campbell Barton commented

2014-12-15 16:12:44 +01:00

Changed status from 'Open' to: 'Archived'

Campbell Barton closed this issue

2014-12-15 16:12:44 +01:00

Campbell Barton commented

2014-12-15 16:12:44 +01:00

This is working as intended, updated tip f51b583ea0

This is working as intended, updated tip f51b583ea0

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Origin Offset: Simple Deform modifier (Bend) #42574