@zipit
Thank you zipit.
I find your methods convenient, but I still need an iterative approach
Can you give me some simple example?

Cheers

Is anyone here?

Hi everyone~~
I want to get all subobject(children) of active object.

This is my idea :

import c4d
from c4d import gui
# Welcome to the world of Python

def all_child(obj):
    if not obj: return
    elif obj.GetDown():
        return obj.GetDown()
    elif obj.GetNext():
        return obj.GetNext()
    while obj.GetUp() and not obj.GetNext():
        obj = obj.GetUp()
    return obj.GetNext()

def main():
    obj = doc.GetActiveObject()
    if not obj: return
    objs = []
    if obj.GetDown():
        while obj:
            objs.append(obj)

            obj = all_child(obj)
    else:
        objs.append(obj)
    
    print len(objs),objs

# Execute main()
if __name__=='__main__':
    main()

but something is wrong, i don't know how to fix it.
somebody can help me?

@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.