Hi, I have created the custom depend node, but it doesn't seems to work.
Description:
It creates a node named "multiplyUnit", having attributes "unit" and
"value", multiplication of both result into the output.
Issue:
When I change the attribute "unit", the value of attribute "value" also
changes, which is wrong, hence the output is also incorrect.
Verbose:
Added a "print" statement in the compute method.
Note:
The plugin(multiplyUnit.py) is attached.
Thanks in advance for any help.
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"""
It creates a Node which will moltiply the value of "unit" attribute to the incoming value
in the "value" attribute and spits the output in "output" attribute
eg. animCurve -> multiplyUnit -> output
3 2 3 * 2 = 6
node name = multiplyUnit
import maya.cmds as mod_mc
mod_mc.loadPlugin(<Path of this Plugin>)
mod_mc.createNode('multiplyUnit')
"""
import maya.OpenMaya as mod_om
import maya.OpenMayaMPx as mod_om_mpx
import sys
nodeName = 'multiplyUnit'
nodeId = mod_om.MTypeId(0x100fff)
class Multiply_Unit(mod_om_mpx.MPxNode):
unit = mod_om.MObject()
value = mod_om.MObject()
output = mod_om.MObject()
def __init__(self):
super(Multiply_Unit, self).__init__()
def compute(self,plug,data_block):
if plug == Multiply_Unit.output:
data_handle_unit = data_block.inputValue(Multiply_Unit.unit)
unit_quantity = data_handle_unit.asFloat()
data_handle_value = data_block.inputValue(Multiply_Unit.value)
value_quantity = data_handle_unit.asFloat()
output_quantity = unit_quantity * value_quantity
data_handle_output = data_block.outputValue(Multiply_Unit.output)
data_handle_output.setFloat(output_quantity)
# Python 2.5.x
sys.stdout.write('%s\nUnit = %s\nValue = %s\nOutput = %s' % ('_' * 30, unit_quantity, value_quantity, output_quantity))
# Python 2.6 onwards
# sys.stdout.write('Unit = {0}\nValue = {1}\nOutput = {2}'.format(unit_quantity, value_quantity, output_quantity))
data_block.setClean(plug)
def node_new():
return mod_om_mpx.asMPxPtr(Multiply_Unit())
def node_init():
attr_fn_set = mod_om.MFnNumericAttribute()
Multiply_Unit.unit = attr_fn_set.create('unit', 'u', mod_om.MFnNumericData.kFloat,0.0)
attr_fn_set.setReadable(1)
attr_fn_set.setStorable(1)
attr_fn_set.setWritable(1)
attr_fn_set.setKeyable(1)
Multiply_Unit.value = attr_fn_set.create('value','v',mod_om.MFnNumericData.kFloat, 0.0)
attr_fn_set.setReadable(1)
attr_fn_set.setStorable(1)
attr_fn_set.setWritable(1)
attr_fn_set.setKeyable(1)
Multiply_Unit.output = attr_fn_set.create('output','o',mod_om.MFnNumericData.kFloat)
attr_fn_set.setReadable(1)
attr_fn_set.setStorable(0)
attr_fn_set.setWritable(0)
attr_fn_set.setKeyable(0)
for custom_attribute in [Multiply_Unit.unit, Multiply_Unit.value, Multiply_Unit.output]:
Multiply_Unit.addAttribute(custom_attribute)
for input_attribute in [Multiply_Unit.unit, Multiply_Unit.value]:
Multiply_Unit.attributeAffects(input_attribute, Multiply_Unit.output)
def initializePlugin(m_object):
m_plugin = mod_om_mpx.MFnPlugin(m_object, 'Author: Anurag Bisht(Day Dreamer)', '1.0')
m_plugin.registerNode(nodeName, nodeId, node_new, node_init, mod_om_mpx.MPxNode.kDependNode)
def uninitializePlugin(m_object):
m_plugin = mod_om_mpx.MFnPlugin(m_object)
m_plugin.deregisterNode(nodeName)
