MPxTransform 2003-11-25 - By m. park
Back
Well, me neither! This is a workaround for the fact that maya doesn't duplicate
well some
attibutes on derived MPxTransform. In a normal implementation, everything sould
be well duplicated
in the base class. But it's not! The only function called on duplication I
found (perhaps there
are some others, but I didn't see them yet) is copyInternalData. If I override
this function and
still call the base class function, I can fix the lacks (and bugs) of the base
class.
Moreover, attibutes like rotate pivot and rotate order are still maya
attributes, so I don't see
any reason why I could not modify it through the public methods of
MFnDependencyNode, or through
script using MGlobal::executeCommand (I know this is not nice, but it should
work).
Bryan, did you already try to write a derived class of the MPxTransform?
Thank you.
Mark
--- Bryan Ewert <maya@(protected)> wrote:
> ? from Mon, 24 Nov 2003 07:51:49 -0800 (PST)
>
> > yes, I have the same problem. I noticed it was not copying other attributes
> > like the rotate order.
>
> > I would say that you could fix that if you override the method :
>
> > void MPxNode:: copyInternalData ( MPxNode *node )
>
> > which is called on duplication.
>
> I don't understand why you should have to do this, or how it would help. I
> would expect the base class to copy its own internal data, particularly if
> you did _not_ override this method with a custom implementation.
> Furthermore, attributes such as the rotate pivot and rotate order are the
> jurisdiction of the base class, not the derived class(es).
>
> Secondly, how would one copy internal data from the base class? Internal
> data is, well, internal, and typically implemented as private data members.
> Objects derived from MPxNode have no access to - nor knowledge of - the
> implementation of the base class's internal data. So how are they supposed
> to copy it?
>
> --
> Bryan Ewert ? maya@(protected) ? http://www.ewertb.com ?
>
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