How do I set and get values from a multi attribute? I can't find any
examples. I know how to read/write to simple floats, but once you
turn it into an array (multi) with setArray(1), I hit a dead-end on
knowing what to do, or even where to look up how I would do such a
thing. Here's a simplified chunk of code:
import sys
import maya.OpenMaya as om
import maya.OpenMayaMPx as omMPx
kPluginNodeTypeName = "pyNode"
pyNodeId = om.MTypeId(0x87000)
class pyNode( omMPx.MPxNode ):
inputs = om.MObject()
output = om.MObject()
def __init__( self ):
omMPx.MPxNode.__init__( self )
def compute( self, plug, dataBlock ):
if ( plug == pyNode.output ):
####Not doin' what I wish it would
dataHandle = dataBlock.inputValue( pyNode.inputs )
inputFloat = dataHandle.asFloatArray()
result = inputFloat[0] ### or [1], or [2], I just want to
be able to pull specific ones
outputHandle = dataBlock.outputValue( pyNode.output )
outputHandle.setFloat[0]( result ) ### or [1], or [2], I
just want to be able to set specific ones
####End wishiness
dataBlock.setClean( plug )
return om.kUnknownParameter
def nodeCreator():
return omMPx.asMPxPtr( pyNode() )
def nodeInitializer():
####I'm guessing this is wrong, too
nAttr = om.MFnNumericAttribute()
pyNode.inputs = nAttr.create ( "inputs", "in",
om.MFnNumericData.kFloat, 0.0 )
nAttr.setArray(1)
nAttr.setStorable(1)
pyNode.addAttribute ( pyNode.inputs )
nAttr = om.MFnNumericAttribute()
pyNode.output = nAttr.create( "output", "out",
om.MFnNumericData.kFloat, 0.0 )
nAttr.setArray(1)
nAttr.setStorable(1)
nAttr.setWritable(1)
pyNode.addAttribute( pyNode.output )
####End likely wronginess
pyNode.attributeAffects( pyNode.inputs, pyNode.output )
def initializePlugin(mobject):
mplugin = omMPx.MFnPlugin(mobject)
try:
mplugin.registerNode( kPluginNodeTypeName, pyNodeId, nodeCreator,
nodeInitializer )
except:
sys.stderr.write( "Failed to register node: %s" %
kPluginNodeTypeName )
raise
def uninitializePlugin(mobject):
mplugin = omMPx.MFnPlugin(mobject)
try:
mplugin.deregisterNode( pyNodeId )
except:
sys.stderr.write( "Failed to deregister node: %s" %
kPluginNodeTypeName )
raise
An answer to the problem is much appreciated, the answer to where you
looked/referenced would be even more appreciated.
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Yours,
Maya-Python Club Team.
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