Adding a Morph Deformer Causes Pose Morph Tag to Stop Working

kangddan

Hello all, I've noticed that my Pose Morph tag stops working after I add a Morph Deformer. It seems that I can't replicate the manual process of adding the Morph Deformer. What might I be doing wrong? bandicam 2024-05-01 20-57-06-001 00_00_00-00_00_30.gif
The main function of the code is to copy the selected object, then add a pose morph, and set the target to the selected object. The reason for adding the Morph Deformer is that I can offset issues with priority lag. However, in the code, once I add the Morph Deformer, the Pose Morph stops working

import c4d

def copyObj(obj):
    _copyObj = obj.GetClone(); doc.AddUndo(c4d.UNDOTYPE_NEW, _copyObj)
    _copyObj.SetName('{}_copy'.format(obj.GetName()))
    _copyObj[c4d.ID_BASEOBJECT_VISIBILITY_EDITOR] = 2
    _copyObj[c4d.ID_BASEOBJECT_VISIBILITY_RENDER] = 2
    doc.InsertObject(_copyObj); _copyObj.InsertAfter(obj)
    
    for tag in _copyObj.GetTags():
        if isinstance(tag, c4d.modules.character.CAWeightTag):
            tag.Remove()

    for child in _copyObj.GetChildren():
        if child.CheckType(c4d.Oskin):
            child.Remove()    
    return _copyObj

def addPoseMorph(target, obj):
    pmTag = obj.MakeTag(1024237)
    priorityData = c4d.PriorityData()
    priorityData.SetPriorityValue(c4d.PRIORITYVALUE_MODE, c4d.CYCLE_INITIAL)
    pmTag[c4d.ID_CA_POSE_BASE_PRI] = priorityData
    
    pmTag[c4d.ID_CA_POSE_POINTS] = 1
    baseMorph = pmTag.AddMorph()   # id0
    targetMorph = pmTag.AddMorph() # id1
    pmTag.UpdateMorphs()
    
    targetMorph.SetName('target') 
    pmTag.SetActiveMorphIndex(1)
    pmTag[c4d.ID_CA_POSE_TARGET] = target 
    pmTag[c4d.ID_CA_POSE_MODE] = 1
    return pmTag

def addMorphDeformer(obj, tag):
    morph = c4d.BaseObject(1019768)
    morph.InsertUnder(obj)
    morph[c4d.ID_CA_MORPH_DEFORMER_OBJECT_TAG] = tag
    morph[c4d.ID_CA_MORPH_DEFORMER_OBJECT_APPLY_BASEPOSE] = True
    
def create():
    sel = doc.GetSelection()
    if not sel: return
    doc.StartUndo()
    for o in sel:
        doc.AddUndo(c4d.UNDOTYPE_CHANGE, o)
        o[c4d.ID_BASEOBJECT_VISIBILITY_EDITOR] = 1
        o[c4d.ID_BASEOBJECT_VISIBILITY_RENDER] = 1
        
        cObj = copyObj(o)
        pmTag = addPoseMorph(o, cObj)
        addMorphDeformer(cObj, pmTag)
        
    doc.EndUndo()
    c4d.EventAdd()
if __name__ == '__main__':
    create()

kangddan

test file

test.c4d

kangddan

Hello everyone, I seem to have found a solution. You just need to go to the Falloff option in Morph and add a default parameter

 data = c4d.FieldList()
morph[c4d.FIELDS] = data

This way, the PoseMorph tag becomes effective. I still don't understand why this is necessary, as I can't find any python related content about the Morph deformer:(

i_mazlov

Hi @kangddan,

Thanks for providing such a good reference for reproducing the issue!

Looks like you're missing the initialization and finalizing phases of creating the morph tag, hence you end up with invalid (or not updated) one. Executing the following functions in the correct order seems to fix your issue. Please have a look at InitMorphs(), UpdateMorphs() and ExitEdit().

Please find the corrected addPoseMorph() function below.

Regarding the falloff option, I assume it implicitly calls UpdateMorphs() function, which updates the morph tag, hence you have it in working state.

Cheers,
Ilia

PS There's no need to insert object to document first, if you later insert it after another object that's already in document, or in other words the doc.InsertObject(_copyObj) call is redundant.

The corrected addPoseMorph function code snippet:

def addPoseMorph(target, obj):
    pmTag = obj.MakeTag(1024237)
    pmTag[c4d.ID_CA_POSE_POINTS] = 1

    pmTag.InitMorphs()

    priorityData = c4d.PriorityData()
    priorityData.SetPriorityValue(c4d.PRIORITYVALUE_MODE, c4d.CYCLE_INITIAL)
    pmTag[c4d.ID_CA_POSE_BASE_PRI] = priorityData
    
    baseMorph = pmTag.AddMorph()   # id0
    targetMorph = pmTag.AddMorph() # id1
    
    targetMorph.SetName('target') 
    pmTag.SetActiveMorphIndex(1)
    pmTag[c4d.ID_CA_POSE_TARGET] = target 
    
    pmTag.ExitEdit(doc, False) # switch to "Animate Mode"
    pmTag.UpdateMorphs()

    return pmTag

kangddan

This post is deleted!

kangddan

Thank u @i_mazlov
I appreciate you pointing me in the right direction. I will try to understand the workings behind the posemorph tag!