Re: [Maya-Python] object1.f[38] in [object2.f[38]] == True?

[Justin Israel]

I don't know much about the PyMel class structures, but it seems something is not defined properly for the __eq__ or __cmp__ methods of the base class, to reflect that they are different objects. There is a lot of inheritance in there so I am not really sure where to trace it back to

f1 = pm.MeshFace("pSphere1.f[0]")

f2 = pm.MeshFace("pSphere2.f[0]")

f3 = pm.MeshFace("pSphere2.f[1]")

# Should be False

print f1 == f2

# True

# Should be False

print f1 == f3

# False

On Wed, Feb 26, 2014 at 12:50 PM, Michael Boon <boon...@gmail.com> wrote:

Hi all,

I have a situation where this happens:

MeshFace(u'foo.f[38]') in [MeshFace(u'pillar_section2_lod0.f[38]')]#Result: True

These are Pymel MeshFaces. The object 'foo' is a result of a boolean operation involving 'pillar_section2_lod0', but the two faces are not the same on each object. I've deleted history on 'foo'.

I'm not sure if the fact that both faces are index 38 is a coincidence or not.

Can someone explain why this might happen? It shouldn't happen, right? Or do I have some misapprehension about MeshFaces?

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[Marcus Ottosson]

I had a look with inspect

import inspect

import pymel.core as pm

node = pm.MeshFace('pSphere1.f[0]')

print inspect.getsourcelines(node.__eq__)

print inspect.getsourcefile(node.__eq__)

..and it looks like it all comes down to this.

def __eq__(self, other):

        if not hasattr(other, '__apicomponent__'):

            return False

        return self.__apicomponent__().isEqual( other.__apicomponent__().object() )

Defined at general.py:3717

It does have an __apicomponent__ attribute, so it ends up comparing it to other.__apicomponent__().object() which says that it is a:

Result: <maya.OpenMaya.MObject; proxy of <Swig Object of type 'MObject *' at 0x0000000038F33E40> > # 

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Marcus Ottosson
konstr...@gmail.com