RandomVertexColor is a python script for Cinema R18 and higher, which allows you to assign random color to connected vertices using the new Vertex Color Tag. I did this script very quickly, the implementation may be a little "naive". I'll try to make some optimizations next time.
This script will use the vertex color tag associated with the selected object, otherwise a new one is created. Afterwards, a random color is applied on every connected vertices chunk
How to use ?
- Select your object
- Execute RandomVertexColor script by choosing it from the script menu or pressing the Execute button if you use the script manager
# -*- coding: utf-8 -*-
# Author: safina3d
# Website: safina3d.blogspot.com
# Description: Assign random color to connected vertices using Vertex Color Tag
import c4d
from c4d import utils, Vector
from random import randint
def get_random_color():
""" Return a random color as c4d.Vector """
def get_random_value():
""" Return a random value between 0.0 and 1.0 """
return randint(0, 255) / 256.0
return Vector(get_random_value(), get_random_value(), get_random_value())
def get_connected_polygons(nbr, start_index):
# type: (Neigbour, int) -> int[]
result = [start_index]
to_do = []
done = []
current = start_index
while current is not None:
connected_polygons = filter(lambda v: v != -1 and v not in result, nbr.GetPolyInfo(current)["face"])
result += connected_polygons
done.append(current)
to_do += filter(lambda v: v not in done, connected_polygons)
current = to_do.pop() if len(to_do) else None
return result
def polygons_to_vertices(op, polygon_list):
# type: (BaseObject, int[]) -> int[]
vertices = []
for polygon_index in polygon_list:
pts = op.GetPolygon(polygon_index)
vertices += [pts.a, pts.b, pts.c, pts.d]
return list(set(vertices))
def get_chunks(nbr, op, remaining_polys):
# type: (Neigbour, BaseObject, int[]) -> int[][]
_chunks = []
while len(remaining_polys) > 0:
connected_polygons = get_connected_polygons(nbr, remaining_polys[0])
_chunks.append(polygons_to_vertices(op, connected_polygons))
remaining_polys = list(set(remaining_polys).difference(connected_polygons))
return _chunks
def main():
if op is None:
return
if c4d.OBJECT_POLYGON != op.GetType():
return
neigbour = utils.Neighbor()
neigbour.Init(op)
vertex_color_tag = op.GetTag(c4d.Tvertexcolor)
if vertex_color_tag is None:
vertex_color_tag = c4d.VariableTag(c4d.Tvertexcolor, op.GetPointCount())
op.InsertTag(vertex_color_tag)
doc.SetActiveTag(vertex_color_tag)
data = vertex_color_tag.GetDataAddressW()
remaining_polys = range(op.GetPolygonCount())
chunks = get_chunks(neigbour, op, remaining_polys)
for chunk in chunks:
color = get_random_color()
for vertex in chunk:
c4d.VertexColorTag.SetColor(data, None, None, vertex, color)
c4d.EventAdd()
if __name__ == '__main__':
main()
