If anyone interested:

def MatrixBlend(mxA, mxB, t):
    quatA = c4d.Quaternion()
    quatA.SetMatrix(mxA)

    quatB = c4d.Quaternion()
    quatB.SetMatrix(mxB)

    return utils.MatrixMove( utils.MixVec(mxA.off, mxB.off, t) ) * utils.QSlerp(quatA, quatB, t).GetMatrix() * utils.MatrixScale( utils.MixVec(mxA.GetScale(), mxB.GetScale(), t) )

@m_magalhaes Thanks Manuel,
I appreciate your wise support every time.

Merry Xmas and Happy New Year!

@m_magalhaes Hi Manuel,

Thanks for the reply.

1. I've read the caution in API documentation, but I have tried it once and now can't stop to use it.
   At least for now I don't face app crashes, so maybe C4D have some safety margin for python developers
2. I can use cache, and I use it. But I want both options to be available.
   BTW when I'm using Cache from execute it also gives me whole tree including the Cloner sub-tree, when executing at Expression priority. In Generator priority GetCache() produces expected results.
3. I don't like to affect DIRTYFLAGS_CACHE, because I'm also optimizing redraw based on dirty check with flag c4d.DIRTYFLAGS_DESCRIPTION | c4d.DIRTYFLAGS_DATA | c4d.DIRTYFLAGS_CHILDREN | c4d.DIRTYFLAGS_CACHE
   Also it seems like VolumeBuilder starts to re-generate mesh after CSTO called, and I went into infinite redraw.
4. Thanks for pointing to IsolateObjects method, but as you mentioned I have to find all linked objects, which is not a trivial task in C4D.
   I wouldn't go that way.
5. Provided solution with the ExecutePasses is updating geometry very rarely (if it supposed to be executed from python tag).
6. Currently made a solution to check baseObject.GetInfo() & c4d.OBJECT_INPUT to stop further children processing.
   Seems to work good enough.

Hi,

I need alternative to GetCache(), and CSTO seems to be a good option.
But Python tag produces wrong geometry when executed over clone of the object with CSTO.
It additionally produces geometry which should be hidden by parent generators (for ex. Cloner under Volume Builder).
Behavior is the same in Python Expression, or Python Tag Plugin, and it affects Cinema4D R21+ at the least.

Here's the code:

                srcClone = srcObj.GetClone(c4d.COPYFLAGS_NO_ANIMATION)
                doc.InsertObject(srcClone)

                cstoResult = c4d.utils.SendModelingCommand(
                    command=c4d.MCOMMAND_CURRENTSTATETOOBJECT,
                    list = [srcClone],
                    mode = c4d.MODELINGCOMMANDMODE_ALL,
                    bc = c4d.BaseContainer(),
                    doc = doc
                )

                srcClone.Remove()

            for resObj in cstoResult:
                for resChildObj in HierarchyIterator(resObj.GetDown()):
                    cloneObject = resChildObj.GetClone(c4d.COPYFLAGS_NO_HIERARCHY)
                    cloneObject.InsertUnderLast(selfObj)

Viewport:

Don't like the idea to call CSTO over original object, because it rebuilds object cache and affect DIRTYFLAGS_CACHE.
What's the issue, is it possible to resolve it?

Plugin https://www.dropbox.com/s/fxz8g7p8uuwc5y0/c4d_tag_csto.zip?dl=0
Scene simple csto test.c4d

Thanks.

@ferdinand Thanks, no issues so far.

Hi @m_adam ,

Adding Touch() is removing visibility of original object, but dynamics stop to work on children after that

BTW, your code throw error:

in GetVirtualObjects
    hierarchy_clone = op.GetAndCheckHierarchyClone(hierarchyhelp, orig, c4d.HIERARCHYCLONEFLAGS_ASPOLY, True, trans)
TypeError: an integer is required

Scene file test_generator.c4d
Generator plugin test_generator.zip

I found it's because of OBJECT_INPUT flag. Single OBJECT_GENERATOR flag is allowing children to have dynamics...

However original objects are observable in the viewport for a fraction of the second every frame update.
Also Make Editable and Current State to Object applied to the generator contains generated + original objects in the null.

How to get same experience as built-in generators, where no source objects are visible, and children dynamics is supported?

Hi,

I'm developing generator plugin over child polygon objects.

It works good with GetAndCheckHierarchyClone + CurrentStateToObjectCommand which might have regular deformers underneath.
But it doesn't work with children with applied dynamics to them.

If it GetDeformCache() + GetCache() - maybe there's an example exist?

@ferdinand you were clear and example is pretty good, I got the idea.
No need to write code for me

But it's not trivial overall, I just need to spend some time on this.

Thanks again.

@ferdinand thanks a lot, seems clear.
More or less...

Hi @ferdinand,

Thank you, appreciate your reply.

So if Spline provided as an input then GetCache() returns LineObject which is great.

Can you please highlight how to deal with Splines under the Cloner object?
Cloner's deform cache in that case returns null with nondeformed splines:

Test generator scene: py-dynamics-cache.c4d