@s_bach thank you for your answer! I think I have the same question as mike do, so it has been solved now. Thank you again!

Hi, @m_adam

Thank you for your kindness and the inspiring answer! It's a GREAT Christmas present for me!

So sorry asking XPresso related questions in this forum.
The problem I faced is a little bit complex than this: I need sample Effectors' total Output Strengths in the position from a Polygon Object's Points, and store the result into a Vertex Color Map attached for further use.
This problem bothers me for months, and I didn't find any clue until your post. I have never think about using Python Node with global variable in XPresso Network can keep the data as I need and do the magic!

From the bottom of my heart, I want to say THANK YOU.
The answer you give not only solve this problem, but also inspire me re-thinking of ObjectList Node and Python Node, and how these nodes executed in an XPresso Network.

Just let me THANK YOU AGAIN!

Best wishes for you to have a wonderful holiday!

Hi,

I have a Null Object with an In-/Exclusion Userdata attached. In In-/Exclusion Userdata some Mograph Effector have been added. I want to use Sample Node to get all Strength of Mograph Effector, then add output Strength together. How can I do?

Here is the snapshot of the scene.

The problem I meet is that I can't use Python to sample the output of a Mograph Effector(Sample Node With Python), and I haven't found a way to cumulate output of an Object List Node.

Thanks!

Hi @r_gigante,
Thank you for replying. I'd like to know more about this topic: if I only know the Control Point Index from PointObject.GetPoint(id) of a spline, how could I get the Spline Position of this point?

Hi, here is a thread from the old forum: Sample Node With Python.
I don't know if there will be any solution for now.

hi @passion3d,
There is no actual n-gon in the underlying layer of Cinema 4D.
Adjacent polygons use hidden edge to create n-gon-like shape(s).

Following code creates a 5-side polygon object:

import c4d, math
from c4d import utils
#Welcome to the world of Python

def main():
    pointCount = 5
    polygonCount = math.ceil(pointCount/4.0)                    # caculate minimum needed polygon number
    polyObj = c4d.BaseObject(c4d.Opolygon)                      # create an empty polygon object

    polyObj.ResizeObject(pcnt=pointCount, vcnt=polygonCount)    # resize object to have 5 points, 2 polygons

    # manually set all point position
    polyObj.SetPoint(id=0, pos=c4d.Vector(200,0,-200))
    polyObj.SetPoint(id=1, pos=c4d.Vector(-200,0,-200))
    polyObj.SetPoint(id=2, pos=c4d.Vector(-200,0,200))
    polyObj.SetPoint(id=3, pos=c4d.Vector(200,0,200))
    polyObj.SetPoint(id=4, pos=c4d.Vector(300,0,0))

    # associate points into polygons
    polygon0 = c4d.CPolygon(t_a=0, t_b=1, t_c=2, t_d=3)
    polygon1 = c4d.CPolygon(t_a=0, t_b=3, t_c=4)

    # set polygon in polygon object
    polyObj.SetPolygon(id=0, polygon=polygon0)
    polyObj.SetPolygon(id=1, polygon=polygon1)

    # set hidden edge
    nbr = utils.Neighbor()
    nbr.Init(op=polyObj, bs=None)                               # create Neighor counting all polygon in
    edge = c4d.BaseSelect()
    edge.Select(num=3)                                          # set selection, which is the id of the edge to be hidden
    polyObj.SetSelectedEdges(e=nbr, pSel=edge, ltype=c4d.EDGESELECTIONTYPE_HIDDEN)  # hide the edge

    polyObj.Message(c4d.MSG_UPDATE)

    doc.InsertObject(polyObj)

    c4d.EventAdd()

if __name__=='__main__':
    main()

Hi @cmpxchg8b and @a_block ,
I don't know much about matrix, but here is what I found.
If the point with arrow should rotate to aim, then all the possible position of the point must lay on the sphere surface which sphere's center is the parent object.
And one point and a vector can form a line in space.
So the question becomes a line-sphere intersection problem.
After solving the equations, we can get 2 points: original point and transformed point(s).
After that, we can find the transform matrix between 2 points.

btw, please read the How to Post Questions, Q&A New Functionality.
I think it's better to move this question into Cinema 4D Development category ;)

Hi @bonsak,
Try use op.GetObject().GetDeformCache().GetPointCount() in a Python Tag on the Polygon Object.
Here you can get more information: GetDeformCache().

@s_bach, thank you, I'll start to do some hard reading!