Created
January 9, 2019 19:40
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Cinema 4D - Python version of my Select Loop plugin
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""" | |
This is a python port of my old Select Loop C++ plugin for Cinema 4D. Rather | |
than porting this to R20 and recompiling, distributing, etc I decided to port | |
it to Python for use as a Script manager plugin. | |
Just import this script into your Script Manager and add it to a toolbar | |
or assign a shortcut. | |
MIT License | |
Copyright 2019 Christopher Montesano | |
Permission is hereby granted, free of charge, to any person obtaining a copy | |
of this software and associated documentation files (the "Software"), to deal | |
in the Software without restriction, including without limitation the rights | |
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
copies of the Software, and to permit persons to whom the Software is furnished | |
to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all | |
copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, | |
INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A | |
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | |
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE | |
SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
""" | |
import c4d | |
from c4d.utils import Neighbor | |
from c4d import gui | |
def get_opposite_edge(poly, p1, p2): | |
if (p1 == p2): | |
return None | |
if (poly.c == poly.d): # triangle | |
return None | |
points = (p1, p2) | |
if poly.a in points and poly.b in points: | |
return poly.c, poly.d | |
if poly.b in points and poly.c in points: | |
return poly.a, poly.d | |
if poly.c in points and poly.d in points: | |
return poly.a, poly.b | |
if poly.d in points and poly.a in points: | |
return poly.b, poly.c | |
return None | |
def get_shared_points(poly1, poly2): | |
shared_points = set() | |
for pta in (poly1.a, poly1.b, poly1.c, poly1.d): | |
for ptb in (poly2.a, poly2.b, poly2.c, poly2.d): | |
if pta == ptb: | |
shared_points.add(pta) | |
return list(shared_points) | |
def select_poly_loop(obj, nth=1, sim=False): | |
if obj is None: | |
raise ValueError("No object selected") | |
if not isinstance(obj, c4d.PolygonObject): | |
raise ValueError("Not a polygon object") | |
cply = obj.GetPolygonCount() | |
cpnt = obj.GetPointCount() | |
bsel = obj.GetPolygonS() | |
if cply == 0: | |
raise ValueError("No polygons found") | |
if bsel.GetCount() != 2: | |
raise ValueError("Exactly two polygons must be selected") | |
plys = obj.GetAllPolygons() | |
selected_ids = [] | |
for index, selected in enumerate(bsel.GetAll(cply)): | |
if not selected: | |
continue | |
selected_ids.append(index) | |
assert(len(selected_ids) == 2) | |
poly1 = plys[selected_ids[0]] | |
poly2 = plys[selected_ids[1]] | |
shared_points = get_shared_points(poly1, poly2) | |
if len(shared_points) != 2: | |
raise ValueError("Selected polygons must share an edge") | |
n = Neighbor() | |
n.Init(obj) | |
for poly_index in range(2): | |
this_poly_index = selected_ids[poly_index] | |
pt1 = shared_points[0] | |
pt2 = shared_points[1] | |
for i in range(cply): | |
nply = n.GetNeighbor(pt1, pt2, this_poly_index) | |
if nply is None: | |
break | |
this_poly_index = nply | |
bsel.Select(nply) | |
if i % nth != 0: | |
bsel.Toggle(nply) | |
opposite_edge = get_opposite_edge(plys[this_poly_index], pt1, pt2) | |
if opposite_edge is None: | |
break | |
pt1, pt2 = opposite_edge | |
if pt1 == shared_points[0] and pt2 == shared_points[1]: | |
break | |
obj.Message(c4d.MSG_CHANGE) | |
c4d.EventAdd() | |
def main(): | |
nth = gui.InputDialog("Select every nth polygon:", "1") | |
nth = int(nth) | |
try: | |
select_poly_loop(op, nth) | |
except ValueError as err: | |
gui.MessageDialog(str(err)) | |
if __name__=='__main__': | |
main() |
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Nice update, and good catch on the IndexError. I expect that would happen when it reaches a boundary of a broken loop.