[Bf-committers] re: Python and layers

[Matt Ebb]

I would say the solution is to change Blender so it does what it  
should when you press ~, which is: enable all 20 3D view layers. It  
shouldn't be touching the other bits for this very reason.

Matt



On 10/10/2006, at 00:18 AM, Campbell Barton wrote:

> Thanks Matt, this makes more sense now.
> Im not sure what the solution should be..
>
> scn1.Layers= scn2.Layers should never raise an error IMHO. so maybe  
> let the user effect the next 12 bits?
>
> That or allow the users to set it but  dont apply the setting of  
> the last 12 bits.
> that means after scn1.Layers != scn2.Layers  which could be  
> confusing :/.
>
> Whats might mess up if  a scene took another scenes layers bits.?
>
> Matt Ebb wrote:
>> 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 theory.
>>
>> Anyway, hope this info is useful to the current situ, and sorry  
>> for not reporting earlier!
>>
>> cheers
>>
>> Matt
>>
>>
>>
>> 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
>
>
> -- 
> Campbell J Barton
>
> 133 Hope Street
> Geelong West, Victoria 3218 Australia
>
> URL:    http://www.metavr.com
> e-mail: cbarton at metavr.com
> phone: AU (03) 5229 0241
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------------------------------------------
Matt Ebb . matt at mke3.net . http://mke3.net



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