How to use c4d.utils.PolygonReduction
I'm struggling to understand how does the polygon reduction works. The manual provides a sample code:
I tried to run this one, but I get the following error:
StandardError: The dictionary must contain a valid polygonal BaseObject (_op dictionary entry)
I understand this error: I'm providing the wrong object type (https://developers.maxon.net/docs/Cinema4DPythonSDK/html/types/objects.html). I think I have to convert the object to PolygonObject, am I right? If so, how do I do that?
That's right, the error you're getting is related to the type of the passed object to be processed by the
The sample code shouldn't try to process an object that isn't a
PolygonObjectbecause there's this check at the beginning:
if not polyObject.IsInstanceOf(c4d.Opolygon): return
To convert a
PolygonObjectthe Current State to Object modeling command can be used.
The utility function below invokes the
def CSTO(obj, doc, inheritance, keepAnimation, noGenerate): bc = c4d.BaseContainer() bc.SetBool(c4d.MDATA_CURRENTSTATETOOBJECT_INHERITANCE, inheritance) bc.SetBool(c4d.MDATA_CURRENTSTATETOOBJECT_KEEPANIMATION, keepAnimation) bc.SetBool(c4d.MDATA_CURRENTSTATETOOBJECT_NOGENERATE, noGenerate) res = c4d.utils.SendModelingCommand(c4d.MCOMMAND_CURRENTSTATETOOBJECT, list=[obj.GetClone()], bc=bc, doc=doc) if isinstance(res, list): return res else: return None
The CSTO() function can then be invoked like this:
if not polyObject.IsInstanceOf(c4d.Opolygon): polyObject = CSTO(polyObject, doc, True, True, False) if polyObject is None: return
I moved the topic to "CINEMA 4D DEVELOPMENT" category and I turned it into a question and answer (you can do this by yourself, see Q&A New Functionality).
Thank you y_puech
Would you be so kindly to explain me the difference between a BaseObject, a PolygonObject and a PointObject? Honestly I don't think the python documentation is really clear
Consider that I'm new to cinema4d (I'm from the blender's world)
A BaseObject is the base type of every object in a document. A PointObject is an object that holds points. Then an object can be a PolygonObject if it has polygons.
For instance if a generator object is made editable then it's transformed into a PolygonObject which is also a PointObject.
The (reduced) object classes inheritance tree is as follows:
Thank you! This is so much clear now