[Bf-python] Matrix comparison broken

[Gilbert, Joseph T.]

How about >, >= , <, <=?
With the vector classes these sort the length of the vector. Should
these be implemented on matrix?
I think we will agree then on numerical identity for '==' on all the
math classes. We'll implement this on quat, euler, matrix.

-----Original Message-----
From: bf-python-bounces at projects.blender.org
[mailto:bf-python-bounces at projects.blender.org] On Behalf Of Campbell
Barton
Sent: Monday, November 21, 2005 4:17 PM
To: Blender Foundation Python list
Subject: Re: [Bf-python] Matrix comparison broken

Id say just numerical equiv. Wil some error margin ~0.000001 or
somthing.
If they are different but describe the same TX then there still
different.
Another func could be used to test the other- added later if people
need.
- Cam


Gilbert, Joseph T. wrote:
> This is default behavior. A == B is by default an instance comparison.
> We need to write overloaded comparison operators for the other math
> classes.
>
> The problem I see here is what the definition of equivalency is for a
> matrix.
> i.e. what does a == b supposed to evaluate? Do you mean they have the
> exact same numbers? If so to what floating point extent. Is a matrix
> equivalent when it describes the same transformation?
>
> -----Original Message-----
> From: bf-python-bounces at projects.blender.org
> [mailto:bf-python-bounces at projects.blender.org] On Behalf Of Campbell
> Barton
> Sent: Monday, November 21, 2005 3:26 PM
> Cc: Blender Foundation Python list
> Subject: Re: [Bf-python] Matrix comparison broken
>
> instance_a is instance_b - Alredy works for instance comparison,
> shouldent we raise an error if its not supported?
> It causes bugs to be written into new python code. - and scriptors
need
> to find out for themselves that its not supported.
> or at least print an error message.
>
> - Cam
>
>
>
>
> Gilbert, Joseph T. wrote:
>   
>> Because matrix has no overloaded comparison operator like vector. 
>> A == b is an instance comparison. It's equivalent to:
>> instance_a == instance_b = False
>>
>>
>> -----Original Message-----
>> From: bf-python-bounces at projects.blender.org
>> [mailto:bf-python-bounces at projects.blender.org] On Behalf Of Campbell
>> Barton
>> Sent: Monday, November 21, 2005 12:25 PM
>> To: bf-python at blender.org
>> Subject: [Bf-python] Matrix comparison broken
>>
>> Entered this into the command line, matrix's never return true when 
>> comparing ATM-
>> a = Mathutils.Matrix()
>> b = Mathutils.Matrix()
>> b == a
>> False
>>
>>   
>>     
>
>
>   


-- 
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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