after boolean snap don't work #52310

New Issue

Massimiliano Puliero · 2017-08-09T04:56:31+02:00

2017-08-09 04:56:31 +02:00

System Information
win7 64bit gtx1070

Blender Version
Broken: 2.78c

Short description of error
after the boolean operation, with the modifier still active, the boolean object is not affected by the snap anymore.

Exact steps for others to reproduce the error
move the selected object and you will see that the snaps don't work anymore.
thankyou

snapbug.blend

**System Information** win7 64bit gtx1070 **Blender Version** Broken: 2.78c **Short description of error** after the boolean operation, with the modifier still active, the boolean object is not affected by the snap anymore. **Exact steps for others to reproduce the error** move the selected object and you will see that the snaps don't work anymore. thankyou [snapbug.blend](https://archive.blender.org/developer/F701090/snapbug.blend)

Massimiliano Puliero commented

2017-08-09 04:56:31 +02:00

Changed status to: 'Open'

Massimiliano Puliero commented

2017-08-09 04:56:31 +02:00

Added subscriber: @MassimilianoPuliero

Germano Cavalcante commented

2017-08-10 16:26:59 +02:00

Added subscriber: @mano-wii

ChameleonScales commented

2017-08-11 15:15:15 +02:00

Added subscriber: @ChameleonScales

ChameleonScales commented

2017-08-11 15:15:15 +02:00

This would be understandable as the surface of the object is affected by the boolean object. However it should at least work when the modifier is hidden, which is not the case. We have to remove the object from the modifier or remove the modifier itself.

Juha Wiiala commented

2017-08-31 16:11:08 +02:00

Added subscriber: @tynkatopi

Sergey Sharybin commented

2017-09-15 09:40:05 +02:00

Added subscriber: @Sergey

Sergey Sharybin commented

2017-09-15 09:40:05 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2017-09-15 09:40:05 +02:00

Sergey Sharybin self-assigned this 2017-09-15 09:40:05 +02:00

Sergey Sharybin commented

2017-09-15 09:40:05 +02:00

Thanks for the report, but it' not really a bug.

What's happening here is that transform system will not allow to snap object which is dependent on currently editing one. This is needed to avoid feedback loops which will ruing your scene. This is done based on dependency graph relations. Those relations are based on modifier stack and not based on modifier visibility flags. Making relations aware of modifier visibility will cause depsgraph rebuilds on every modifier visibility toggle, which isn't really something you want from performance point of view. But additionally, making relations aware of such visibility will make it really hard to spot dependency cycles when some modifier is only enabled for render and not for viewport.

So while this is annoying issue, we can't really make snapping to work here as you expect: if modifier is enabled, then you hit feedback cycle and object will snap to some weird location., disabled modifiers are tricky to support and still somewhat unpredictable and useless for snapping.

Thanks for the report, but it' not really a bug. What's happening here is that transform system will not allow to snap object which is dependent on currently editing one. This is needed to avoid feedback loops which will ruing your scene. This is done based on dependency graph relations. Those relations are based on modifier stack and not based on modifier visibility flags. Making relations aware of modifier visibility will cause depsgraph rebuilds on every modifier visibility toggle, which isn't really something you want from performance point of view. But additionally, making relations aware of such visibility will make it really hard to spot dependency cycles when some modifier is only enabled for render and not for viewport. So while this is annoying issue, we can't really make snapping to work here as you expect: if modifier is enabled, then you hit feedback cycle and object will snap to some weird location., disabled modifiers are tricky to support and still somewhat unpredictable and useless for snapping.

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after boolean snap don't work #52310