Point Density Texture ID User decrement error related to the Object field #52148

New Issue

Vuk Gardašević · 2017-07-22T04:22:50+02:00

Vuk Gardašević commented

2017-07-22 04:22:50 +02:00

System Information
Windows 7, AMD x3 455, R7 360

Blender Version
builds 8009564, db8bc1d

Short description of error
Removing an object causes an ID user decrement error: OBCube.001 (from '[Main]'): 0 <= 0 if a Point Density texture has it referenced in the Object Field

Exact steps for others to reproduce the error
Default Scene > Create a new mesh object > add a Cycles material > Enable use nodes > add a Point Density texture in the Node Editor > select a mesh object in the Object field of the texture node > Delete the chosen object

Doesn't matter if the deleted object itself has the material or not nor the Object field is self referencing (the same object has the material and the Object field references it).

The Cloud Generator add-on has the similar error since it uses the Point Density texture in the "DeGenerate" option upon the scripted removal of the objects.

**System Information** Windows 7, AMD x3 455, R7 360 **Blender Version** builds `8009564`, ` db8bc1d` **Short description of error** Removing an object causes an `ID user decrement error: OBCube.001 (from '[Main]'): 0 <= 0` if a Point Density texture has it referenced in the Object Field **Exact steps for others to reproduce the error** Default Scene > Create a new mesh object > add a Cycles material > Enable use nodes > add a Point Density texture in the Node Editor > select a mesh object in the Object field of the texture node > Delete the chosen object Doesn't matter if the deleted object itself has the material or not nor the Object field is self referencing (the same object has the material and the Object field references it). The *Cloud Generator* add-on has the similar error since it uses the Point Density texture in the "DeGenerate" option upon the scripted removal of the objects.

Vuk Gardašević commented

2017-07-22 04:22:50 +02:00

Changed status to: 'Open'

Vuk Gardašević commented

2017-07-22 04:22:50 +02:00

Added subscriber: @VukGardasevic

Sergey Sharybin commented

2017-07-28 11:24:30 +02:00

Added subscribers: @mont29, @Sergey

Bastien Montagne was assigned by Sergey Sharybin

2017-07-28 11:24:30 +02:00

Sergey Sharybin commented

2017-07-28 11:24:30 +02:00

@mont29, selecting Object in PointDensity node doesn't increase user counter, however removing object will try to reduce user counter from PointDensity node. Also, re-loading file after choosing point density object will increase users of that object.

Not sure what would be a proper solution here: either make selecting object in PointDensity to increase user counter (then how?) or do something more like modifiers where user counter is not increased by target objects?

@mont29, selecting Object in PointDensity node doesn't increase user counter, however removing object will try to reduce user counter from PointDensity node. Also, re-loading file after choosing point density object will increase users of that object. Not sure what would be a proper solution here: either make selecting object in PointDensity to increase user counter (then how?) or do something more like modifiers where user counter is not increased by target objects?

Bastien Montagne commented

2017-07-28 12:13:39 +02:00

Yuck… yeah, this is really hairy…

We could add exception in libraryquery to not set refcounting flag when DI pointer of a node is an object. This is more consistent with other places where we use Objects (though I really, really dislike that stance of 'no object refcount besides scene instantiation'). But am pretty sure this will not work reliably either, NULL pointer could very easily break things again in that case I guess.

So will rather try to make assigning pointer to Node ID increment usercount, we do it already for others (images etc.) so should not be that difficult ;)

Yuck… yeah, this is really hairy… We could add exception in libraryquery to not set refcounting flag when DI pointer of a node is an object. This is more consistent with other places where we use Objects (though I really, really dislike that stance of 'no object refcount besides scene instantiation'). But am pretty sure this will not work reliably either, NULL pointer could very easily break things again in that case I guess. So will rather try to make assigning pointer to Node ID increment usercount, we do it already for others (images etc.) so should not be that difficult ;)

blender-admin commented

2017-07-28 12:43:06 +02:00

This issue was referenced by 05f377805b

This issue was referenced by 05f377805bec3b43a78b45662859d085c1c6e6a0

Bastien Montagne commented

2017-07-28 12:46:05 +02:00

Changed status from 'Open' to: 'Resolved'

Bastien Montagne closed this issue

2017-07-28 12:46:05 +02:00

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Point Density Texture ID User decrement error related to the Object field #52148