[Bf-committers] re: Python and layers

Matt Ebb matt at mke3.net
Mon Oct 9 16:03:56 CEST 2006

Funny you guys mention this, I ran into a similar problem earlier  
with the 3DS importer choking when I had all layers enabled. I was  
going to mention it but I was without internet at the time and forgot.

Anyway, at least in my case I think the 'problem' (or at least the  
possible solution) is in Blender itself. As you guys would know, the  
layers int in blender is abused for more than just layers, which  
complicates things.

However, when you press ~ to enable all 3D View layers, it actually  
does more than that, it sets every bit in the layers int to 1. This  
is bad behaviour, since when a user is pressing ~ they mean to show  
all the 20 3D View layers, they don't mean to mess with the other 12  
flags for local view or whatever it is. When python checks to see if  
all layers are enabled, it's just looking at the 20 layer bits as it  
should, and not the extra ones. So python was comparing the int that  
should be when 20 layers are set to the number that is actually there  
after you press ~ in Blender (which is much higher) and found that  
they mismatch, giving an error. From memory, manually clicking all  
the little layer buttons to set them on worked, which confirms this  

Anyway, hope this info is useful to the current situ, and sorry for  
not reporting earlier!



On 09/10/2006, at 23:43 PM, Campbell Barton wrote:

> Alexander Ewering wrote:
>> On Mon, 9 Oct 2006, Campbell Barton wrote:
>>> campbellbarton (Campbell Barton) 2006/10/09 06:29:24 CEST
>>>  Modified files:
>>>    blender/release/scripts image_billboard.py
>>>    blender/release/scripts/bpymodules BPyRender.py
>>>    blender/source/blender/python/api2_2x Scene.c
>>>  Log:
>>>  BPyRender.imageFromObjectsOrtho's now sets all layers visible,
>>>  an error in Scene.c - scn.Layers disallowd all layer bits to be  
>>> set.
>> The error is not in Scene.c, but in BPyRender.py, which tries to  
>> enable 21
>> layers instead of 20.
>> To avoid such confusion, I would suggest replacing arbitary *decimal*
>> numbers which don't mean a thing with things such as (1 << 20)-1, or
>> at least 0xfffff.
> are you sure? - if you enable all layers and then print them the  
> scn.Layers the number it spits  out is 2097151
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Matt Ebb . matt at mke3.net . http://mke3.net

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