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

@ferdinand I also use ScreenToGif to make pictures！

@ferdinand Thank you for your detailed answer!
In my autoweight function, there is no error in the calculation result of the tangent, but when setting the CKey, there is a problem. It seems that there are too many parameters set, which causes the left and right time values of the key frame to be set according to the calculation results. Then an unknown change was made, causing the final value to not match the calculated value. Although I still don't know why those settings will cause the value to go wrong.

wrong code:

    key.SetInterpolation(curve,c4d.CINTERPOLATION_SPLINE)

    key.SetTimeLeft(curve,L_time_v)
    key.SetValueLeft(curve,TL_vector[1])
    key.SetTimeRight(curve, R_time_v)
    key.SetValueRight(curve, TR_vector[1])

    key[c4d.ID_CKEY_PRESET] = c4d.ID_CKEY_PRESET__CUSTOM
    key.ChangeNBit(c4d.NBIT_CKEY_AUTO, c4d.NBITCONTROL_CLEAR)
    key.ChangeNBit(c4d.NBIT_CKEY_BREAK, c4d.NBITCONTROL_SET)
    key.ChangeNBit(c4d.NBIT_CKEY_KEEPVISUALANGLE, c4d.NBITCONTROL_SET)

current code：

    key.SetInterpolation(curve,c4d.CINTERPOLATION_SPLINE)
    key.SetTimeLeft(curve,L_time_v)
    key.SetValueLeft(curve,TL_vector[1])
    key.SetTimeRight(curve, R_time_v)
    key.SetValueRight(curve, TR_vector[1])
    key.ChangeNBit(c4d.NBIT_CKEY_AUTO, c4d.NBITCONTROL_CLEAR)

Using the current code, the left and right time values of CKey, the calculated result matches the final result.
this is an print example:

    Calculate_RTime: 0.0301874202486 After_Set_Get_from_Key_RTime 0.03

gif also shows that it is working fine now.

@ferdinand Thanks for your help!
I have been looking for the source of the problem. After seeing your answer, I should have looked in the wrong direction (I always thought that SetTimeLeft() could not accurately transmit the value I calculated). Below I uploaded a GIF to show the problem I encountered more accurately.
1: I use Add key slider to dynamically add functions. It will call my autoweight function by default. It can be seen that in the process of dynamic addition, the error of RightTime == 0 of some key frames appears
2: When I dynamically use EasyInOut slider to perform the smoothing process, it also calls the autoweight function, and it still does not correct the wrong situation
3: When I use c4d's default auto tangent classic for these key frames, then use EasyInOut again to perform the smoothing process, the autoweight function will work normally.
So I don’t know why this happens, because the above code is used to set the key in the autoweight function

It seems that can't see the gif in full,i upload a file ,can be download. easyinout2.gif

@aimidi said in SetTimeRight fail!:

SetTangents

Thanks for your help,but not find SetTangents() in python sdk

Hi, when the value I set is very small, such as BaseTime.get() is 0.001, by using SetTimeRight（）, but when I access this value again by script, the result is BaseTime.get() is 0. but SetTimeLeft（） can Successfully set, such as BaseTime.get() is -0.001 !
Thanks for any help!

        key.SetInterpolation(curve,c4d.CINTERPOLATION_SPLINE)
        

        key.SetTimeLeft(curve,L_time_v)
        key.SetValueLeft(curve,TL_vector[1])
        key.SetTimeRight(curve, R_time_v)
        key.SetValueRight(curve, TR_vector[1])

        key[c4d.ID_CKEY_PRESET] = c4d.ID_CKEY_PRESET__CUSTOM
        key.ChangeNBit(c4d.NBIT_CKEY_AUTO, c4d.NBITCONTROL_CLEAR)
        key.ChangeNBit(c4d.NBIT_CKEY_BREAK, c4d.NBITCONTROL_SET)
        key.ChangeNBit(c4d.NBIT_CKEY_KEEPVISUALANGLE, c4d.NBITCONTROL_SET)

@ferdinand Thanks for your detailed reply!
" 2.The timeline (and as a matter of fact also the world coordinate system) has no implied unit. There is no direct translation as 1px == 1cm as both the horizontal axis and vertical axis depend on the zoom level." solved my question！

Hi,
I want to use my method to calculate the tangent and weight of the animation curve.

But I ran into a problem. I can’t know how the vector base of the coordinate system of the TimeLine panel is defined. In the 3D coordinate system, x=1 cm, y=1cm, z=1cm, but in the TimeLine panel, x= 1Frame ?1 second, y =1 cm?1%? or 1 Degree.

Thanks for any help!

@ferdinand Thanks,great!

Hi,
in picture object Position gui unit is real, Rotation gui unit is Degree , User data gui unit is Percent. how to know gui unit? and how to directly obtain the value displayed on the panel(Data = 0.1745, want to directly get 17.453)?

Thanks for any help!

@m_adam Great, thank you！