Hi,in another post I found a way to achieve my goal of converting the coordinate position to camera space and then scaling it to a small size so that he appears first.

this is new code:

def Draw(self,op, drawpass, bd, bh):
    
    
    if not op[c4d.S_MOTIONTRAIL_GTWO_DRAWENABLE]:
        return c4d.DRAWRESULT_OK
    #bd.SetMatrix_Matrix(None, c4d.Matrix())
    pmg = ~bd.GetMg()
    bd.SetMatrix_Camera()

    all_pos = self.parameters['all_pos']
    color_lis = self.parameters['color_lis']
    point_size = op[c4d.S_MOTIONTRAIL_GTWO_POINTSIZE]
    bd.SetPointSize(point_size)
    for per_pos,color in zip(all_pos,color_lis):
        bd.SetPen(color)
        cnt = len(per_pos)
        temp_lis = []
        for i in xrange(cnt-1):
            c = (pmg * per_pos[i]).GetNormalized() * 20
            f = (pmg * per_pos[i+1]).GetNormalized() * 20
            bd.DrawLine(c,f,c4d.NOCLIP_D)
            temp_lis.append(c)
        temp_lis.append(f)
        bd.DrawPoints(temp_lis)
    

    return c4d.DRAWRESULT_OK

why * 20 will work, * 1or 2 not work (c = (pmg * per_pos[i]).GetNormalized() * 20)?

I found a solution in other posts, and this is an video example:

example code:

import c4d

from c4d import bitmaps,gui





class DraggingArea(c4d.gui.GeUserArea):
    def __init__(self):
        self.startx = 0
        self.starty = 0

    def DrawMsg(self, x1, y1, x2, y2, msg):


        # Initializes draw region
        self.OffScreenOn()
        self.SetClippingRegion(x1, y1, x2, y2)
        icon_bmp = bitmaps.InitResourceBitmap(5159)
        icon_clip = bitmaps.GeClipMap()
        icon_clip.InitWithBitmap(icon_bmp,icon_bmp.GetInternalChannel())

        clip = bitmaps.GeClipMap()
        w,h = self.GetWidth(),self.GetHeight()
        clip.Init(w,h)
        clip.BeginDraw()
        clip.SetColor(0,0,180)
        clip.FillRect(0,0,w,int(h*0.4))
        clip.SetColor(180,0,0)
        clip.FillRect(0,int(h*0.4),w,h)

        clip.SetDrawMode(c4d.GE_CM_DRAWMODE_BLEND,255)
        clip.Blit(self.startx,self.starty,icon_clip,0,0,icon_clip.GetBw(),icon_clip.GetBh(),c4d.GE_CM_BLIT_COL)


        clip.EndDraw()
        # Get default Background color
        bmp = clip.GetBitmap()
        self.DrawBitmap(bmp,0,0,w,h,0,0,w,h,c4d.BMP_NORMAL)




    def InputEvent(self, msg):
        """
        Called by Cinema 4D, when there is a user interaction (click) on the GeUserArea.
        This is the place to catch and handle drag interaction.

        :param msg: The event container.
        :type msg: c4d.BaseContainer
        :return: True if the event was handled, otherwise False.
        :rtype: bool
        """
        # Do nothing if its not a left mouse click event
        if msg[c4d.BFM_INPUT_DEVICE] != c4d.BFM_INPUT_MOUSE and msg[c4d.BFM_INPUT_CHANNEL] != c4d.BFM_INPUT_MOUSELEFT:
            return True

        # Retrieves the initial position of the click
        mouseX = msg[c4d.BFM_INPUT_X]
        mouseY = msg[c4d.BFM_INPUT_Y]
        mouse_pos_dict = self.Global2Local()
        x, y = mouse_pos_dict['x'] + msg.GetInt32(c4d.BFM_INPUT_X), mouse_pos_dict['y'] + msg.GetInt32(
            c4d.BFM_INPUT_Y)  
        self.startx = x
        self.starty = y

        # Initializes the start of the dragging process (needs to be initialized with the original mouseX, mouseY).
        self.MouseDragStart(c4d.KEY_MLEFT, mouseX, mouseY, c4d.MOUSEDRAGFLAGS_DONTHIDEMOUSE | c4d.MOUSEDRAGFLAGS_NOMOVE)
        isFirstTick = True

        # MouseDrag needs to be called all time to update information about the current drag process.
        # This allow to catch when the mouse is released and leave the infinite loop.
        while True:

            # Updates the current mouse information
            result, deltaX, deltaY, channels = self.MouseDrag()
            if result != c4d.MOUSEDRAGRESULT_CONTINUE:
                break

            # The first tick is ignored as deltaX/Y include the mouse clicking behavior with a deltaX/Y always equal to 4.0.
            # However it can be useful to do some initialization or even trigger single click event
            if isFirstTick:
                isFirstTick = False
                continue

            # If the mouse didn't move, don't need to do anything
            if deltaX == 0.0 and deltaY == 0.0:
                continue

            # Updates mouse position with the updated delta
            mouseX -= deltaX
            mouseY -= deltaY
            x -= deltaX
            y -= deltaY
            self.startx = int(x)
            self.starty = int(y)




            # Redraw the GeUserArea (it will call DrawMsg)
            self.Redraw()

        # Asks why we leave the while loop
        endState = self.MouseDragEnd()



        return True


class MyDialog(c4d.gui.GeDialog):
    """
    Creates a Dialog with only a GeUserArea within.
    """

    def __init__(self):
        # It's important to stores our Python implementation instance of the GeUserArea in class variable,
        # This way we are sure the GeUserArea instance live as long as the GeDialog.
        self.area = DraggingArea()

    def CreateLayout(self):
        """
        This method is called automatically when Cinema 4D Create the Layout (display) of the Dialog.
        """
        self.AddUserArea(1000, c4d.BFH_SCALEFIT | c4d.BFV_SCALEFIT)
        self.AttachUserArea(self.area, 1000)
        return True


def main():
    # Creates a new dialog
    dialog = MyDialog()

    # Opens it
    dialog.Open(dlgtype=c4d.DLG_TYPE_MODAL_RESIZEABLE, defaultw=500, defaulth=500)


if __name__ == '__main__':
    main()

@gheyret Thanks for your help!
i use "c4d.CallCommand(12147) # Redraw" to replace c4d.EventAdd() or c4d.Redraw(), it also work!

change code:

        if id == 1001:
            for obj in doc.GetObjects():
                obj.ChangeNBit(c4d.NBIT_EHIDE,c4d.NBITCONTROL_CLEAR)
            c4d.CallCommand(12147) # Redraw
            return True

@r_gigante @zipit
The detailed explanation is shown below
“up interpolattion”


Try use "spline trail"

I read some papers, but always been very slow, just only expanded know, such as Frenet–Serret formulas etc. But I did not directly find a better way to replace my current method, and I have been looking for it.

Computation of Rotation Minimizing Frames This seems to be a good paper, I will read it carefully.

@m_adam Thank you for your team's reply.
I will share my exploration in this post in the future.

The problem has been resolved, reinstall the graphics driver and perform a custom clean installation！

try use GetDirty(DIRTYFLAGS_CACHE)，compare last dirty and current dirty

@i_mazlov Thank you for your detailed reply, it was really helpful！
The following video shows the results, which work well. The blue polygon uses GetPolyPointST()

Hi,
you can read this thread

Hi @i_mazlov
Through exploring these two pages，page1,page2, I have converted them into Python code Inverse_Bilinear_Interpolation(), which can replace GetPolyPointST(). I am not sure why GetPolyPointST() may obtain incorrect values in certain situations, but Inverse_Bilinear_Interpolation() does not go wrong in complex situations.

video use Inverse_Bilinear_Interpolation()

code:

import math


# algorithm_InverseBilinearInterpolation 逆双线性插值 的算法

def Wedge2D(v:c4d.Vector,w:c4d.Vector):
    return v[0] * w[1] - v[1] * w[0]

def Inverse_Bilinear_Interpolation(p:c4d.Vector,p0:c4d.Vector,p1:c4d.Vector,p3:c4d.Vector,p2:c4d.Vector):

    """
    注意对点顺序的定义
    Attention :  points Order

    p2 --- p3
    |      |
    |      |
    p0 --- p1

    """

    q = p - p0
    b1 = p1 - p0
    b2 = p2 - p0
    b3 = p0 - p1 - p2 + p3

    A = Wedge2D(b2,b3)
    B = Wedge2D(b3,q) - Wedge2D(b1,b2)
    C = Wedge2D(b1,q)
    # 求V - solve v
    if abs(A) < 0.00000001:
        v = -C / B
    else:
        discrim = B * B - 4.0 * A * C
        v = 0.5 * (-B - math.sqrt(discrim)) / A  # CCW
        #v = 0.5 * (-B + math.sqrt(discrim)) / A  # CW

    # 求 u - solve u
    denom = b1 + v * b3

    if abs(denom[0]) > abs(denom[1]):
        u = (q[0] - b2[0] * v) / denom[0]
    else:
        u = (q[1] - b2[1] * v) / denom[1]

    return u,v
# example use CPolygon point position a,b,c,d, and point p in quard(CPolygon)
# u,v = Inverse_Bilinear_Interpolation(p,a,b,c,d)

sample file: custom-quadrilateral.c4d

But for the code part, there are still some doubts about the difference between CCW and CW. When I understand what's going on, I will come back and reply. If any friend can explain, that's the best!

@ferdinand Thank you. hope this can be updated in the document

Hi @ferdinand , in .res file, how to set InExcludeData IN_EXCLUDE_FLAG_SEND_SELCHANGE_MSG is True? in c++ API doc,there no this flags for IN_EXCLUDE_FLAG_SEND_SELCHANGE_MSG

Supplement an example of generating UserData using code:

import c4d


def main() -> None:
    
    
    bc = c4d.GetCustomDataTypeDefault(c4d.CUSTOMDATATYPE_INEXCLUDE_LIST)
    bc[c4d.DESC_NAME] = "Test"
    bc[c4d.IN_EXCLUDE_FLAG_SEND_SELCHANGE_MSG] = True
    did = op.AddUserData(bc)
    c4d.EventAdd()

if __name__ == '__main__':
    main()

@ferdinand Thanks,it works!

Hi,
i use this script code to detect obj selected in InExcludeData(),always return "None"

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:
    ie = op[c4d.ID_USERDATA,1]
    for i in range(ie.GetObjectCount()):
        print(ie.GetData(i)[c4d.IN_EXCLUDE_DATA_SELECTION])

if __name__ == '__main__':
    main()

i found a example code in this post,but it also not work.

Thanks for any help!

@ferdinand Thanks for reply
Other channels（BOX,X-Ray....） also seem to be unfeasible, and currently it seems only can accept this limitation (affected by depth of field)
Due to the current not to transfer to C++, some plugin ideas are indeed somewhat unusual
only using some simple C4D drawings to generate Bitmaps, so I did not pay attention to the handling of Ocio. I will carefully read the manual on this aspect in the document.

@ferdinand Thanks,
DRAWPASS::HANDLES There is a limitation that only displays when I select the object, and my goal is to keep it displayed (select or not select)
code:

    def Draw(self,op, drawpass, bd, bh):

        

        if drawpass == c4d.DRAWPASS_OBJECT:
            #draw
            bd.SetMatrix_Screen()
            
            window_dict = bd.GetSafeFrame()
            
            bd.SetLightList(c4d.BDRAW_SETLIGHTLIST_NOLIGHTS)
            # set uv ... info
            uvadr = [c4d.Vector(), c4d.Vector(), c4d.Vector(), c4d.Vector()]
            uvadr[1] = c4d.Vector(1, 0, 0)
            uvadr[2] = c4d.Vector(1, 1, 0)
            uvadr[3] = c4d.Vector(0, 1, 0)
            padr = [c4d.Vector(), c4d.Vector(), c4d.Vector(), c4d.Vector()]  
            padr[0] = c4d.Vector(window_dict['cl'], window_dict['ct'], 0)
            padr[1] = c4d.Vector(window_dict['cr'], window_dict['ct'], 0)
            padr[2] = c4d.Vector(window_dict['cr'], window_dict['cb'], 0)
            padr[3] = c4d.Vector(window_dict['cl'], window_dict['cb'], 0)
            map = xx  # this can be any images
            cadr = [c4d.Vector(1), c4d.Vector(1), c4d.Vector(1), c4d.Vector(1)]
            nadr = [c4d.Vector(1), c4d.Vector(1), c4d.Vector(1), c4d.Vector(1)]
            if map:
                bd.DrawTexture(map, padr, cadr, nadr, uvadr, 4, c4d.DRAW_ALPHA_NORMAL, c4d.DRAW_TEXTUREFLAGS_TEMPORARY)
        
        return c4d.DRAWRESULT_OK

hi,
I have a OBJECT_GENERATOR plugin and I encountered some problems while drawing it. I am drawing something in screen space use BaseDraw.DrawTexture(), and when I turn on depth of field of viewport, the drawn content is also affected. How to make the drawn content not affected by depth of field.
Thanks for any help!

@ferdinand

Hi,
I used the example code from c4d.documents.RendeDocument() in the document, which indicates that the values returned by progress are between 0-1.0. However, in my actual use, there may be some values greater than 1.0

This is my code, using Viewport Render with a frame range of 1001-1100

"""
Copyright: MAXON Computer GmbH
Author: Maxime Adam

Description:
    - Render the current document with a progress hook to get notified about the current rendering progress.

Class/method highlighted:
    - c4d.bitmaps.MultipassBitmap
    - c4d.documents.RenderDocument()

"""
import c4d



def PythonCallBack(progress, progress_type):
    """Function passed in RenderDocument. It will be called automatically by Cinema 4D with the current render progress.

    Args:
        progress (float): The percent of the progress for the current step
        progress_type (c4d.RENDERPROGRESSTYPE): The Main part of the current rendering step
    """
    print(progress)


def main():
    # Retrieves the current active render settings
    rd = doc.GetActiveRenderData()

    # Creates a Multi Pass Bitmaps that will store the render result
    bmp = c4d.bitmaps.MultipassBitmap(int(rd[c4d.RDATA_XRES]), int(rd[c4d.RDATA_YRES]), c4d.COLORMODE_RGB)
    if bmp is None:
        raise RuntimeError("Failed to create the bitmap.")

    # Adds an alpha channel
    bmp.AddChannel(True, True)



    # Renders the document
    if c4d.documents.RenderDocument(doc, rd.GetDataInstance(), bmp,c4d.RENDERFLAGS_EXTERNAL, prog=PythonCallBack,
                                    wprog=None) != c4d.RENDERRESULT_OK:
        raise RuntimeError("Failed to render the temporary document.")

    # Displays the render in the Picture Viewer
    #c4d.bitmaps.ShowBitmap(bmp)


if __name__ == "__main__":
    main()

Thanks for any help!