Posts made by chuanzhen

@ferdinand Thanks for detailed explanation.
Let me introduce the goals that the custom deformer plugin wants to achieve. (As can be seen from the cube, cube. 1, cube. 2... in the image, each object has a weight tag.) The custom deformer plugin needs to preprocess and store some data before the ModifyObjects () function works. (By clicking a button) Access the weight tag of each object to be deformed in Message (), preprocess and store some data, and then use the preprocessed data to execute the ModifyObjects () function to correctly process the deformation calculation.

In C4D, it seems that the Surface deformer has achieved a similar function

(there are certain benefits to restricting the custom deformer plugin only to the parent level, as there is no need to spend effort on correctly linking the corresponding preprocessed data when the ModifyObjects () function works.But it did break the general logic operation of the deformer)

The only way you could do that is by checking each deformed object being passed into , to be the parent of the also passed in (i.e., the deformer also simply accessible via ). Only for an which is the parent of would you then carry out the modification.

@ferdinand Thank you for your detailed reply.
If there is no direct method, it is a feasible solution to re implement the defoemer logic. However, since it requires storing data separately for each object that needs to be deformed, limiting the deformable device to only act on the parent object is a limited but more efficient method.

Hi,
deformer object can deform an object in two ways:
method A as a child of the deformed object,
method B at the same level as the deformed object.

There is a problem. In a custom deformer plugin, I obtain the deformed object in the Message() function. Using the first method A, I can obtain the deformed object ''Cube. x'' through node. GetUp(). but method B, how can I access the deformed object (Cube, Cube. 1, Cube. 2)?

Thanks for any help!

@ferdinand Thank you for explanation. The point of confusion should be marked as 2 in the image. in doc the counterclockwise rotation (ccw) refers to the counterclockwise rotation from the spatial perspective of the image. but for the same rotation, the z-axis should have rotated clockwise（cw）. However, in any case, the calculation is correct, only the description is different。
(Describing a rotation of an axis, it is assumed that a person looks in the negative direction from the positive direction of the axis, and based on this, counterclockwise and clockwise are defined)

Hi,
When I read the matrix manual in python sdk doc, I found that the descriptions of 1 and 2 seem contradictory. In c4d, counter-clockwise rotation (ccw) displays a positive value 90 °, while clockwise rotation (cw) displays a negative value -90 °. However, in image marker 2, the transformation should be clockwise cw 90 ° (i.e. R.B=-90 °), not ccw90 °

When I restart C4D, I cannot reproduce this problem. It's really confusing, c4d 2025.2.1 (And I also forgot to save the file at that time, resulting in the loss of the file on site)

hi,
A parent object has 2 child objects whose global matrix are the same. They have the same frozen transform value, but the transform values are different. I used GetFrozenMln() to obtain the frozen matrix and found that the frozen matrix of the 2 child objects are *different.

Why do 2 child objects have the same frozen transform value but different frozen matrix?

@i_mazlov there is video, 2025.2.1,win11

Hi,
use bellow code will causing C4D to crash

import c4d

doc: c4d.documents.BaseDocument  # The currently active document.
op: c4d.BaseObject | None  # The primary selected object in `doc`. Can be `None`.

def main() -> None:
    rd = c4d.documents.RenderData()
    rd[c4d.RDATA_FRAMERATE] = 2.0


if __name__ == '__main__':
    main()

safe setting code:

    rd = c4d.documents.RenderData()
    data = rd.GetDataInstance()
    data[c4d.c4d.RDATA_FRAMERATE] = 2.0

bug?

@i_mazlov Thanks,it works!

@i_mazlov Thanks

@i_mazlov Thanks,in my code I found an error and directly used the value obtained from PRIORITYVALUEMYODE in the priority GUI to set the list The priority parameter in Add() is a low-level error.
But there is still a problem. When I used your code and adjusted the priority of **Python tag*to expression 1, the calculation order did not execute as expected. Where exactly is the problem？
My version is also 2025.2.0

@i_mazlov Thanks for reply!
I added this flag and modified the content of AddToExecution(). Execute() was successfully called, but it did not run in the expected calculation order. In the image below, The Cube object has a Python tag with priority=expression 0 and objectplugin with priority=expression 10. My expected work order should be python tag (priority=expression 0) -> objectplugin (priority=expression 10), but why is the actual running result objectplugin (priority=expression 10) ->python tags (priority=expression 10)

my code:

    def Execute(self, op, doc, bt, priority, flags) -> int:

        print("Execute")
        return c4d.EXECUTIONRESULT_OK

    def AddToExecution(self, op, list) -> bool:
        print("AddToExecution")
        mode = op[c4d.S_TEMP_PRIORITY].GetPriorityValue(c4d.PRIORITYVALUE_MODE)
        list.Add(op, mode,c4d.EXECUTIONFLAGS_NONE)

Hi,
In the tag plugin, i use MSG_EDIT in Message() to detect the double-click behavior of the mouse, and then execute some commands. However, when create tag, MSG_EDIT is also used. I tried using gui.GetInputState (c4d.BFM_INPUT_MOUSE, c4d.BFM_INPUT_DOUBLECLICK,bc) obtains specific information to distinguish between label create tag and double-click behavior, but bc no double click information is obtained.
code:

    def Message(self, node: GeListNode, type: int, data: object) -> bool:
        if type == c4d.MSG_EDIT:
            
            c4d.CallCommand(200000084) # Rectangle Selection

            bc = c4d.BaseContainer()
            gui.GetInputState(c4d.BFM_INPUT_MOUSE,c4d.BFM_INPUT_DOUBLECLICK,bc)
            if bc[c4d.BFM_INPUT_DOUBLECLICK] : 
                print("double")
            return True
        return True

How to distinguish between these two behaviors
Thanks for any help!

Hi,
I have created a object modifier plugin and I want it to work once in priority Expression 10, and then again in Generator 1. How can I make it work as expected?
In the code, AddToExecution() and Execute() do not seem to work (the documentation states that switching priorities requires calling these two functions).

import c4d
from c4d import plugins, bitmaps


PLUGIN_ID = 1000001

class S_Temp(plugins.ObjectData):


    def Execute(self, op, doc, bt, priority, flags) -> int:
        print("Execute")
        return c4d.EXECUTIONRESULT_OK

    def AddToExecution(self, op, list) -> bool:
        print("AddToExecution")
        return True


    def Init(self, node, isCloneInit: bool) -> bool:
        self.InitAttr(node, c4d.BaseList2D, c4d.S_TEMP_POSEDTARGETS)
        self.InitAttr(node, c4d.BaseList2D, c4d.S_TEMP_POSEDSOURCEADD)
        self.InitAttr(node, c4d.PriorityData, c4d.S_TEMP_PRIORITY)

        if not isCloneInit:
            pridata = c4d.PriorityData()
            pridata.SetPriorityValue(c4d.PRIORITYVALUE_MODE, c4d.CYCLE_EXPRESSION)
            pridata.SetPriorityValue(c4d.PRIORITYVALUE_PRIORITY, 10)
            node[c4d.S_TEMP_PRIORITY] = pridata
        return True

    def ModifyObject(self, mod, doc, op, op_mg, mod_mg, lod, flags, thread):
        allp = [pos + c4d.Vector(0,100,0) for pos in op.GetAllPoints()]
        op.SetAllPoints(allp)
        op.Message(c4d.MSG_UPDATE)

        return True


if __name__ == '__main__':
    plugins.RegisterObjectPlugin(id=PLUGIN_ID, str="S_Temp", g=S_Temp, description="stemp", info=c4d.OBJECT_MODIFIER,
                                 icon=None)

Here is the file of this plugin --> s_Temp.zip

Thanks for any help!

@i_mazlov Thanks for your help, it works well.

@JH23 Thanks for your help,this is indeed a solution.
For existing objects in Object Manager, using this code is effective, but creating a new object and setting it up yields a different result, which is confusing.

@chuanzhen said in Change Icon Color parameter:

import c4d

doc: c4d.documents.BaseDocument  # The currently active document.
op: c4d.BaseObject | None  # The primary selected object in `doc`. Can be `None`.

def main() -> None:
    for i in range(2):
        obj = c4d.BaseObject(c4d.Ojoint)
        obj[c4d.ID_BASELIST_ICON_COLORIZE_MODE] = 2
        obj[c4d.ID_BASEOBJECT_USECOLOR] = 2
        obj[c4d.ID_BASEOBJECT_COLOR] = c4d.Vector()

        obj.SetName(str(i))
        doc.InsertObject(obj)
    c4d.EventAdd()


if __name__ == '__main__':
    main()

hi,
I use script to create bone and insert it to document, set it Icon Color=Display Color,Why does the Icon Color parameter of the object turn to Custom when I click on it.

import c4d

doc: c4d.documents.BaseDocument  # The currently active document.
op: c4d.BaseObject | None  # The primary selected object in `doc`. Can be `None`.

def main() -> None:
    for i in range(2):
        obj = c4d.BaseObject(c4d.Ojoint)
        obj[c4d.ID_BASELIST_ICON_COLORIZE_MODE] = 2
        obj[c4d.ID_BASEOBJECT_USECOLOR] = 2
        obj[c4d.ID_BASEOBJECT_COLOR] = c4d.Vector()

        obj.SetName(str(i))
        doc.InsertObject(obj)
    c4d.EventAdd()


if __name__ == '__main__':
    main()

Thanks for any help!

@ferdinand Thanks for your help.
For the unwanted effect of perspective distortion, I tried projecting a fixed size line onto an object to determine the length of the projected line in the world, and then proceeded to draw it.

code:

import c4d

doc: c4d.documents.BaseDocument  # The document containing this field object.
op: c4d.BaseTag  # The Python tag containing this code.
flags: int  # The execution flags of `main()`. See c4d.EXECUTIONFLAGS for details.
priority: int  # The execution priority of this tag. See c4d.EXECUTIONPRIORITY for details.
tp: c4d.modules.thinkingparticles.TP_MasterSystem  # The TP system of the document.

def GetLineAndPlaneIntersection(plane_pos, plane_normal, line_start, line_dir):

    zero_find = line_dir.Dot(plane_normal)
    if zero_find == 0:
        return False, None
    else:
        d = (plane_pos - line_start).Dot(plane_normal) / zero_find


    return True, line_start + d * line_dir


def main() -> None:

    pass







def draw(bd: c4d.BaseDraw) -> bool:


    if op[c4d.EXPRESSION_ENABLE]:
        c_mg = bd.GetMg()
        c_mi = bd.GetMi()

        plane_normal = c_mg.v3

        plane_100_point = c_mg * c4d.Vector(0,0,100)
        plane_obj_point = op.GetMain().GetMg().off

        intersect,intersect_100_plane_point = GetLineAndPlaneIntersection(plane_100_point, plane_normal, plane_obj_point, c_mg.off - plane_obj_point)
        line_end = intersect_100_plane_point + (c_mg * c4d.Vector(5,0,0) - c_mg.off)  # fixed size
        intersect,intersect_obj_plane_point = GetLineAndPlaneIntersection(plane_obj_point, plane_normal, c_mg.off, line_end - c_mg.off)
        length = (intersect_obj_plane_point - plane_obj_point).GetLength()



        mg = op.GetMain().GetMg()
        pos = bd.WS(plane_obj_point)
        bd.SetMatrix_Screen()
        bd.SetPen(c4d.GetViewColor(c4d.VIEWCOLOR_XAXIS))
        x = bd.WS(mg * c4d.Vector(length,0,0))
        bd.DrawLine2D(pos,x)
        bd.SetPen(c4d.GetViewColor(c4d.VIEWCOLOR_YAXIS))
        y = bd.WS(mg * c4d.Vector(0,length,0))
        bd.DrawLine2D(pos,y)
        bd.SetPen(c4d.GetViewColor(c4d.VIEWCOLOR_ZAXIS))
        z = bd.WS(mg * c4d.Vector(0,0,length))
        bd.DrawLine2D(pos,z)


    return True

hi,
I tried to have an object display its coordinate axis at a fixed screen space length, but it didn't work properly. Where did I make a mistake with my code?

This is a c4d file that displays its coordinate axis using tags.-->

video:

code:

import c4d

doc: c4d.documents.BaseDocument  # The document containing this field object.
op: c4d.BaseTag  # The Python tag containing this code.
flags: int  # The execution flags of `main()`. See c4d.EXECUTIONFLAGS for details.
priority: int  # The execution priority of this tag. See c4d.EXECUTIONPRIORITY for details.
tp: c4d.modules.thinkingparticles.TP_MasterSystem  # The TP system of the document.


def main() -> None:
    """Called by Cinema 4D to execute the tag.
    """
    # Get the object the tag is attached to and its global position.
    pass






def draw(bd: c4d.BaseDraw) -> bool:
    # Called to display some visual element in the viewport. Similar to TagData.Draw.
    # Write your code here
    if op[c4d.EXPRESSION_ENABLE]:
        size = 40  #  40 pixel length line
        bd.SetMatrix_Screen()
        start = c4d.Vector(200)
        end = start + c4d.Vector(size,0,0)
        bd.SetPen(c4d.Vector(1.0))
        bd.DrawLine2D(start, end)

        mg = op.GetMain().GetMg()
        pos = bd.WS(mg.off)


        length = size/bd.WP_W(pos,True)


        bd.SetPen(c4d.Vector(1.0,0,0))
        x = bd.WS(mg * c4d.Vector(length,0,0))
        bd.DrawLine2D(pos,x)
        bd.SetPen(c4d.Vector(0,1.0,0))
        y = bd.WS(mg * c4d.Vector(0,length,0))
        bd.DrawLine2D(pos,y)
        bd.SetPen(c4d.Vector(0,0,1.0))
        z = bd.WS(mg * c4d.Vector(0,0,length))
        bd.DrawLine2D(pos,z)


    return True

Thanks for any help!