hi,
It is not clear what parameter you want to modify. The code you are sharing is inside GetDDescription i suppose.
You need to user SetParameter on your node itself. The tricky part is to build the DescID to target the right parameter.
You need the ID of your fieldList, the ID of the layer on that list and the parameter ID on that layer. All level must be defined as CUSTOMDATATYPE_FIELDLIST.
You must search for the layer inside your field list and call GetUniqueID on it. This will return the correct ID you must use in your DescLevel. Below a script that will flip/flop the parameter "enable/value" for the first layer in the list.
I created a python script for r20 and for more recent version
R20 version
import c4d
def main():
# Called when the plugin is selected by the user. Similar to CommandData.Execute.
effector = op
if effector is None:
raise ValueError("there is no active objet")
fieldList = effector[c4d.FIELDS]
root = fieldList.GetLayersRoot()
clampLayer = root.GetDown()
# Retriving the unique ID allows to construct the DescID to target the right parameter.
clampUniqueID = clampLayer.GetUniqueID()
# Building the DescID
# This ID is composed of three level:
# the first one define the field list parameter,
# the second define the layer, that is why we need its UniqueID,
# the last level define the parameter in this layer.
# Note that all DescLevel are of DataType CUSTOMDATATYPE_FIELDLIST
enableID = c4d.DescID(c4d.DescLevel(c4d.FIELDS, c4d.CUSTOMDATATYPE_FIELDLIST), c4d.DescLevel(clampUniqueID, c4d.CUSTOMDATATYPE_FIELDLIST), c4d.DescLevel(c4d.ID_FIELDLAYER_ENABLE_VALUE, c4d.CUSTOMDATATYPE_FIELDLIST))
# Retreving the value using GetParameter on the effector itself.
value = effector.GetParameter(enableID, c4d.DESCFLAGS_GET_NONE)
# Define the oposite value
effector.SetParameter(enableID, not value, c4d.DESCFLAGS_SET_NONE)
c4d.EventAdd()
if __name__ == '__main__':
main()
Same example but for more recent version of c4d.
from typing import Optional
import c4d
doc: c4d.documents.BaseDocument # The active document
op: Optional[c4d.BaseObject] # The active object, None if unselected
def main() -> None:
# Called when the plugin is selected by the user. Similar to CommandData.Execute.
effector :c4d.BaseObject = op
if effector is None:
raise ValueError("there is no active objet")
fieldList :c4d.FieldList = effector[c4d.FIELDS]
root :c4d.GeListHead = fieldList.GetLayersRoot()
clampLayer :c4d.modules.mograph.FieldLayer = root.GetDown()
# Retriving the unique ID allows to construct the DescID to target the right parameter.
clampUniqueID = clampLayer.GetUniqueID()
# Building the DescID
# This ID is composed of three level:
# the first one define the field list parameter,
# the second define the layer, that is why we need its UniqueID,
# the last level define the parameter in this layer.
# Note that all DescLevel are of DataType CUSTOMDATATYPE_FIELDLIST
enableID :c4d.DescID = c4d.DescID(c4d.DescLevel(c4d.FIELDS, c4d.CUSTOMDATATYPE_FIELDLIST), c4d.DescLevel(clampUniqueID, c4d.CUSTOMDATATYPE_FIELDLIST), c4d.DescLevel(c4d.ID_FIELDLAYER_ENABLE_VALUE, c4d.CUSTOMDATATYPE_FIELDLIST))
# Retreving the value using GetParameter on the effector itself.
value : bool = effector.GetParameter(enableID, c4d.DESCFLAGS_GET_NONE)
# Define the oposite value
effector.SetParameter(enableID, not value, c4d.DESCFLAGS_SET_NONE)
c4d.EventAdd()
if __name__ == '__main__':
main()
Cheers,
Manuel
