[Bf-python] Matrix comparison broken
cbarton at metavr.com
Mon Nov 21 22:17:20 CET 2005
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.
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
> The problem I see here is what the definition of equivalency is for a
> 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
> 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
>> 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
Campbell J Barton
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e-mail: cbarton at metavr.com
phone: AU (03) 5229 0241
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