Hi,
I'm also havung the same issue. i want to create a expression to give the
rotation values of a locator to a selected control of a rig. the rig name
may vary.
import maya.cmds as mc
cntl = mc.ls(selection=True)[0]
print(cntl)
loc1 = mc.spaceLocator()[0]
print(loc)
mc.expression( s = ('loc1 + ".RotateX" = cntl + ".RotateX"') )
can you please help me understan the procedure
On Thursday, March 12, 2009 at 11:01:25 PM UTC+5:30 elrond79 wrote:
> Unfortunately, there are still a bunch of places in maya that only
> take MEL (and not python) - expressions being a big culprit.
>
> My general approach when I have to do stick in some mel code into a
> python script is to have the mel call a python function, instead of
> putting in a mel literal string.
>
> ie, instead of:
>
> Method 1 - Raw String:
> =================
>
> melCommand = r'''
> $someVal = $someOtherVal
> '''
>
> I might do:
>
> Method 2 - Call python function:
> =======================
>
> melCommand = r'''python("import myCommand;myCommand.go()")'''
>
> However, expressions are actually their own language, similar but
> somewhat different from mel... and I seem to recall that last time I
> tried to mix python and expressions, there were some additional
> complications... something to do with imports, I think? So, trying to
> do Method 2 may end up being more trouble than it's worth, especially
> if it's a very simple expression.
>
> If you want to use a mel string, but need to dynamically change it,
> you'll have to fall back on string formatting operations, I'm afraid.
> Ie:
>
> expressionCommand = r'''
> spriteScaleXPP=rand(%f,%f);
> spriteScaleYPP=spriteScaleXPP;
> spriteSpin=rand(%f);
> spriteTwistPP=rand(%f,%f);''' % (scaleMin, scaleMax, spinMax,
> twistMin, twistMax)
>
> (Look up Section "3.6.2 String Formatting" in the python help for details.)
>
> Note that, for readability, using the r (for a raw string literal),
> and triple quoting it can help a lot (see section "2.4.1 String
> Literals" in the python help for details).
>
> Finally, as regards your outlinerEditor problem - maya GUI callback
> CAN generally run python code, but there's some weird issues to work
> around. For details, see this topic:
>
>
> http://groups.google.com/group/python_inside_maya/browse_thread/thread/4fe55cd54ebb822/7fffe668f7b814e1?lnk=gst&q=gui+callback#7fffe668f7b814e1
>
> ...and look for Ofer Koren's post, which actually quotes the pymel docs.
>
> Good luck!
>
> - Paul
>
>
>
>
> On Tue, Mar 10, 2009 at 9:17 PM, [email protected]
> <[email protected]> wrote:
> >
> >
> > Hi Guys,
> > this is probably one of those questions that has been asked a
> > million times but meh, dynamic expressions as we all know are written
> > in maya, as mel expressions, and to use these in python we simply
> > write it as MEL in brackets and all is dandy. except how do we edit
> > the contents of these expressions? can we even do so ? as they are MEL
> > scripts i am unsure. i thought the MEL.EVAL might be of help but am
> > unsure.
> >
> > Example:....
> >
> > mc.dynExpression('%s'%spriteOutParticleName,s="spriteScaleXPP=rand
> > (0.5,1.8);\r\nspriteScaleYPP=spriteScaleXPP;\r\nspriteSpin=rand
> > (-90-45);\r\nspriteTwistPP=rand(-90,90);",c=1)
> >
> > basically how can i edit the values inside the " ", inserting
> > variables etc. HELP !
> >
> >
> > so i surrender this to the PYTHON gods, how do we edit MEL dynamic
> > expresssions, through python ?
> >
> > As an offering to the said gods i present the solution to
> > another python/Mel problem
> >
> > if you need the outliner in your GUI, which is quite useful, and need
> > a command to be executed whenever the user clicks on an element with
> > in the outliner... you can t. it will only execute mel commands. weird
> > no? after a few hours of pointlessly playing i ve solved this issue by
> > using a mel wrapper. this is just one example but the principle is the
> > same
> >
> > import maya.cmds as cmds
> > import maya.mel as mel
> >
> > def tester():
> > print "hello"
> >
> > mel.eval( " global proc wrapper() { python( \"tester()\" ); } " )
> >
> > cmds.window()
> > cmds.frameLayout( labelVisible=False )
> > panel = cmds.outlinerPanel()
> > outliner = cmds.outlinerPanel(panel, query=True,outlinerEditor=True)
> > cmds.outlinerEditor( outliner, edit=True, sec="wrapper()")
> > cmds.showWindow()
> >
> > just thought i d share it
> > >
> >
>
--
You received this message because you are subscribed to the Google Groups
"Python Programming for Autodesk Maya" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/python_inside_maya/62f91475-41b1-45c0-a8d7-c688a94212aen%40googlegroups.com.
