Hi,
Jumping in but did anyone notice some bugged behavior, where pluging
commands using flags with String String String arguments forms are not
correctly made accessible in Python by Maya ?
Having the problem at the moment with 3delight's Ri commands, that work
well from Mel but can't be accessed correctly from Python for that
reason :
http://www.3delight.com/en/modules/PunBB/viewtopic.php?id=1643
Did anyone manage to write a plugin command using that type of syntax
and have it correctly handled by Maya in Python, a MSyntax::
addFlag (const char *shortName, const char *longName, MArgType
argType1,
MArgType argType2, MArgType
argType3 with like 3 String arguments?
Olivier
Paul Molodowitch wrote:
Well, glad you got that sorted out. =)
Still, I'm a little surprised that the PRMan plugin didn't also supply
a python version of mtor - generally speaking, as long as the plugin
is implemented "properly" - ie, uses MSyntax for it's command arg
processing - it should make both a python and mel command.
- Paul
On Thu, Sep 17, 2009 at 3:41 AM, Drake <[email protected]> wrote:
Hey Paul,
Thx a lot for the detailed explanation. During the tracing of pymel's
Mel class, I did notice the different handling of mel commands and mel
functions and I didn't realize that I have found the solution yet.
PRMan's mtor is command-styled and I would use pymel.mel.mtor
('control', 'getvalue', '-sync') for them.
Sometimes, it is too convenient to use pymel such that we made some
very fundamental mistakes~
-- Drake
On Sep 17, 12:04 am, Paul Molodowitch <[email protected]> wrote:
Hey drake -
First of all, for commands from plugins, BOTH a python command and a
mel command should be made. So, both of these should be valid:
// From mel:
mtor(...)
# From python:
import maya.cmds
maya.cmds.mtor(...)
Also, if you encounter problems with pymel.mel's wrapping, you can
always fall back on the the default maya.mel.eval, which just
evaluates a mel string:
import maya.mel
maya.mel.eval('mtor ...')
Thus far, I've just talked about stuff in maya's standard python/mel
- now onto pymel. Note that I don't have access to Renderman myself,
so I can't give definitive answers on the mtor command, but this
should point you in the right direction.
In pymel, you can access the maya.cmds python function as normal:
import pymel
pymel.mtor(...)
Note, however, that if you did something like this:
from pymel import *
loadPlugin('mtor.so')
mtor(...)
...you would get:
# NameError: name 'mtor' is not defined #
The reason here is that when you did the 'from pymel import *', the
'mtor' command was not defined - you will have to either re-import *
into your namespace, or use pymel.mtor
Making a guess at the syntax for the mtor command, the best way to
invoke the command you were looking for would probably be something
like this:
mtor('control', 'getvalue', sync=True)
If, for some reason, you have to use the MEL version of the command,
note that pymel's 'mel' wraps things using the 'function' syntax of
the mel command, not the 'command' syntax. If you're not clear on the
difference between the two, here's an example:
// mel command syntax:
xform -q -translation;
// mel function syntax:
xform("-q", "-translation");
Thus, the correct way to invoke this command from pymel.mel would also be:
pymel.mel.xform("-q", "-translation");
So, if you had to call mtor from python using the mel version, you
would likely do something like this:
pymel.mel.mtor('control', 'getvalue', '-sync')
Finally, as a last fallback, you can use pymel.mel.eval, which is just
a wrapper for the standard maya.mel.eval:
pymel.mel.eval('mtor control getvalue -sync')
On Wed, Sep 16, 2009 at 4:48 AM, Drake <[email protected]> wrote:
It's a lovely design to use 'mel.ooxx(...)' to invoke mel function as
'ooxx ...' but we encountered one special case as Pixar's mtor
function. In mel, mtor's function works like these:
mtor control getvalue -sync;
mtor control getvalue -rg dspyName;
mtor control setvalue -rg "dspyQuantizeOne" -value $ooxx;
...
We could not directly make it work through pymel as following:
mel.mtor("control getvalue -sync")
Therefore, I did my own dirty hack on Mel class to make the above code
snippet work. I am wondering what is the suggested way to invoke some
mel functions like 'mtor'?
-- Drake
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http://groups.google.com/group/python_inside_maya
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--
Olivier Renouard
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