@zipit
Thank you man ! I see how to fix it now！~~

Cheers
harry

ViewportSelect.Init(width, height, bd, pick_obj, c4d.Mpolyedgepoint, True, c4d.VIEWPORTSELECTFLAGS_IGNORE_HIDDEN_SEL)

pick_obj = ViewportSelect.PickObject(bd, doc, mx, my, 0, c4d.VIEWPORT_PICK_FLAGS_0)

Like this? But C4D giving feedback: UnboundLocalError: local variable 'pick_obj' referenced before assignment.

Hi! guys! Here's the problem with utils.ViewportSelect()

This is my code:

ViewportSelect = c4d.utils.ViewportSelect()

frame = bd.GetFrame()
left = frame["cl"]
right = frame["cr"]
top = frame["ct"]
bottom = frame["cb"]
width = right - left + 1
height = bottom - top +1

pick_obj = ViewportSelect.PickObject(bd, doc, mx, my, 0, c4d.VIEWPORT_PICK_FLAGS_0)
print pick_obj

ViewportSelect.Init(width, height, bd, pick_obj, c4d.Mpolyedgepoint, True, c4d.VIEWPORTSELECTFLAGS_IGNORE_HIDDEN_SEL)
for obj in pick_obj:
        print obj
        nearest_poly = ViewportSelect.GetNearestPolygon(obj, mx, my, 0, False)

Cinema 4D giving feedback: RuntimeError: Object is not initialized yet.
How can i fix it?

@zipit
No spline path,just surface of object

Hello! guys! I want to make a tool plugin like a brush tool, and i can use this tool draw objects on other object surface.And now, i want my drawn object to follow the direction of my mouse, like this:

Actually, i have a simple idea for this;

next_obj = parent_obj.GetDown().GetNext()
while next_obj:
    pos = -(next_obj.GetPred().GetRelPos() - next_obj.GetRelPos())
    normalized = pos.GetNormalized()
    rot = c4d.utils.VectorToHPB(normalized)
    pred = obj.GetPred()
    pred.SetRelRot(rot)
    next_obj = next_obj.GetNext()    

But I think this method is too forced, I don't know if I can get the mouse direction information

@r_gigante
Yes! It's really helpful.

@zipit
Thanks for everything. You're really been a big help for me.
It works!!!

Cheers
Harry

@zipit
yes it works. but if you object is rotated on X axis 90 degrees, and click the script ,something is wrong...

@zipit
Thank you very much for your reply. Maybe I did not describe the problem clearly. Actually, the problem I encountered is like this：

For example : if i use rotate tool rotate my object and click my script.
1.the axis can move correctly.
2.but the object moves with it.(this is my problem)

I don't want my objects to move,and I want my object to stay in place and only move the object axis

thank you again.
Cheers
harry

Hi, guys! i'm a new python guy and i want to move my object axis only, like center axis tool .and now i can move the axis on Y axis like this:
it's work fine

but if i rotate the object , it's have a problem(I don't know why i can't upload my next GIF).

I think this is a matrix problem, but matrix a little bit hard for me ,i have no idea how to fix it.
Hope you guys can help me.

This is my code:

import c4d


def main():
    obj = doc.GetActiveObject()
    axis_offset = c4d.Vector(0,100,0)
    
    points = obj.GetAllPoints()
    count = obj.GetPointCount()
    obj_pos = obj.GetAbsPos()
    
    doc.AddUndo(c4d.UNDOTYPE_CHANGE,obj)
    for i in xrange(len(points)):
        points[i] = points[i] + (axis_offset*-1)
        obj.SetAllPoints(points)
        obj.SetAbsPos(obj_pos+axis_offset)
        
    obj.Message(c4d.MSG_UPDATE)
    c4d.EventAdd()
    
if __name__=='__main__':
    main()