RuntimeError setAttr

[flaye]

I get this error, and haven't been able to find the source of it. Is it way Python interprets the numbers for Y & Z?

# RuntimeError: setAttr: Error reading data element number 1: [(24.1303752966691, 1.4210854715202004e-13, 5.329070518200751e-15)] #

Here's the method that generates it:

def FKstretch(self,limb,side,ctrlAttr,rigJnt,axis):
       
        # create attribute
        mc.addAttr(ctrlAttr,ln="stretch",at="double",min=0.1, max=3, dv=1,k=True)
        mc.setAttr(ctrlAttr+".stretch")
       
        # get primary axis length value
       
        jntLength=mc.getAttr("{0}.t{1}".format(rigJnt,axis))
       
               
        setFkMdn=mc.shadingNode("multiplyDivide", au=True,n="{0}_MDN".format(ctrlAttr))
        mc.setAttr(setFkMdn+".operation",1) #set to multiply, just in case
        mc.setAttr(setFkMdn+".input1X",jntLength)
       
        mc.connectAttr(ctrlAttr+".stretch", setFkMdn+".input2X")
        mc.connectAttr(setFkMdn+".outputX",rigJnt+".t{0}".format(axis))

The strange thing is that this method works perfectly fine when called by the legs joints, but not by the arms. The code is identical for both.

thanks

[Justin Israel]

It would be great if you could identify which line actually produces this error.

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[Eduardo Grana]

Hello Flaye,

Maybe you are trying to set a double3 type with this?

[(24.1303752966691, 1.4210854715202004e-13, 5.329070518200751e-15)]

If this is the case,

be aware, you have a list with a tuple inside, so you need something like

*[(24.1303752966691, 1.4210854715202004e-13, 5.329070518200751e-15)][0]

Hope this helps,

Eduardo

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Eduardo Graña
www.eduardograna.com.ar

[flaye]

Justin: I believe the error returns on this line

mmc.setAttr(setFkMdn+".input1X",jntLength)


Eduardo: if the above is correct, I'll assume that the jntLength variable is the one getting the list. I tried adding the [0] at the end of it, but it returns a "TypeError: 'float" object has no attribute '__getitem__'

again, the odd thing is that it works perfectly well when it's the leg joints that need the stretch FK, but not the arms.



[flaye]

I'm beginning to suspect this has to do with the joint setup of the bind skeleton. Only the translation on the primary joint orientation is supposed to show up, but I get the dreaded -0 values in the other two axis. It also does not update the code for finding the primary joint orientation axis

I'll update once I (hopefully) find the culprit.