[Bf-committers] Re: [Bf-blender-cvs] CVS commit: blender/source/blender/python/api2_2x Mesh.c Mesh.h

[Stephane SOPPERA]

Martin Poirier a écrit :
> --- Campbell Barton <cbarton at metavr.com> wrote:
>
>   
>> campbellbarton (Campbell Barton) 2006/10/04 19:06:29
>> CEST
>>
>>   Modified files:
>>     blender/source/blender/python/api2_2x Mesh.c
>> Mesh.h 
>>   
>>   Log:
>>   mesh.transform() was applying the inverted 4x4
>> matrix to the normals, without removing the
>> translation part.
>>     
>
>
> Not only that, it should only apply the inverted
> rotation matrix, leaving out any scaling components.
>   
You have to take into account scaling part if scaling is not uniform 
(scaleX!=scaleY for example). That's why normals are to be multiplied by 
inverse transpose (which is identity when the matrix only represents a 
rotation), when position is only multiplied by the matrix itself.

Stephane