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)?

@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.

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

Hi,
you can read this thread

@m_adam Great, thank you！

Hi,
I want to get Preferences folder path of my c4d.
Thanks for any help!

@m_adam Thanks

Hi ,@m_magalhaes
When I set the string for AddEditText , for example, set the string "walker_aaa", I want to mark "_aaa", but I don't know how to mark it.

I only found "BFM_EDITFIELD_GETBLOCKSTART" "BFM_EDITFIELD_GETCURSORPOS" in the document.

Hi,

How c4d GeDialog achieves the effect of gif, I only know how to control the position of the cursor

Thanks for any help!

@r_gigante Thanks for your help!

@Cairyn
It seems I should try some other solutions.Thanks for your help.

@Cairyn
Thanks,useful!
Is there a way to directly obtain the object using this uniquely identified ID?

Hi,
If there are multiple objects with the same name and the same type in the object manager, what is the unique identification of each object.
Thanks for any help!

my python plugins(draw some point in spline) work in R21 and R22 have different result in viewport

in Right/Top/Front view use code

bd.SetMatrix_Camera()
offset = c4d.Vector(0.0,0.0,-100000.0)
new_point = bd.WC(test_pointone) + offset
s = bd.WC(test_pointone) + offset
e = bd.WCtest_pointtwo) + offset

so i change code for R22

bd.SetMatrix_Camera()
offset = c4d.Vector(0.0,0.0,-100000.0)
in_v = c4d.Vector(1.0,-1.0,1.0)
new_point = (bd.WC(test_pointone) + offset) ^ in_v
s = (bd.WC(test_pointone) + offset) ^ in_v
e = (bd.WCtest_pointtwo) + offset) ^ in_v

R22 Change Something?
Thanks for any help!