Custom Subdivide Generator

On 25/07/2015 at 05:28, xxxxxxxx wrote:

I've been experimenting with python and c4d to learn about it's basics, and made myself this python generator to subdivide the contained object.

However, the code continues to subdivide on each mouse movement, it keeps subdividing the end result until everything is out of memory.

What am I missing here?

import c4d
#Welcome to the world of Python

def main() :
    child = op.GetDown()
    if child is None:
    settings = c4d.BaseContainer()
    settings[c4d.MDATA_SUBDIVIDE_SUB] = 1
    polyobj = op.GetAndCheckHierarchyClone(hh,child,c4d.HIERARCHYCLONEFLAGS_ASPOLY,False)["clone"]
    return polyobj

On 27/07/2015 at 00:17, xxxxxxxx wrote:

Looking for a solution

On 27/07/2015 at 05:30, xxxxxxxx wrote:


GetAndCheckHierarchyClone() is an optimized function. It will return a cached polygon object if the generator or the child object are not dirty (you can actually read the C++ source code in c4d_baseobject.cpp ).

As you know, GetAndCheckHierarchyClone() does not return an object but a dictionary. If the "dirty" value is true a new polygon copy was created based on the original object. If it is false a cached version is used and you must not apply the subdivision again.

The Python Generator is only executed on every mouse move if you disable "Optimize Cache".

Best wishes,

On 27/07/2015 at 13:51, xxxxxxxx wrote:

I use a python generator however I don't get why it keeps getting the already subdivided model
The line always takes the "child" object

polyobj = op.GetAndCheckHierarchyClone(hh,child,c4d.HIERARCHYCLONEFLAGS_ASPOLY,False)["clone"]

When I change the "False" to "True" it does not work at all. (printing polyobj returns base object instead of a polygonal object)

I forgot to mention that the child object is a box primitive, I want this to work with primitives as well, however I don't know if this is related to the repetitive continuous subdivision problem at all?

Edit: To clarify the problem once again:
Even though I get the model once and apply the subdivision once (per execution) the script keeps applying the subdivision over the already subdivided model over and over. This is the behavior I want to fix.

On 28/07/2015 at 02:35, xxxxxxxx wrote:


as I said, GetAndCheckHierarchyClone() does not always create a new polygon copy of the given object but will return a cached polygon object if the original object did not change. Since you apply the subdivision to that polygon object, you will apply the subdivision not only once but again and again to it if it is returned again by GetAndCheckHierarchyClone().

So you don't have to change "False" to "True" but you have to check that value and react accordingly. Something like this:

result = op.GetAndCheckHierarchyClone(hh,child,c4d.HIERARCHYCLONEFLAGS_ASPOLY,False)  
polyobj = result["clone"]  
if result["dirty"] is True:  

best wishes,

On 28/07/2015 at 03:08, xxxxxxxx wrote:

Oh, amazing!
When "False" is changed to "True" it does not give me a polygonal object (but the base object is returned), is this how it's supposed to work?

On 28/07/2015 at 09:08, xxxxxxxx wrote:


is your latest question actually related to the topic of your other thread: "GetAndCheckHierarchyClone & subdivision surfaces ?"?

best wishes,

On 28/07/2015 at 11:17, xxxxxxxx wrote:

Yes and no,
I'm just experimenting with python, both questions are related to the same experimentation however problems are different (maybe related), just opened different topics for different problems/questions to make it as clear as possible for the future newcomers like myself.