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# ***** BEGIN GPL LICENSE BLOCK *****
#
# Script copyright (C) Campbell J Barton
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ***** END GPL LICENSE BLOCK *****
# --------------------------------------------------------------------------
# <pep8 compliant>
def applyVertexDirt(me, blur_iterations, blur_strength, clamp_dirt, clamp_clean, dirt_only):
from mathutils import Vector
from math import acos
#BPyMesh.meshCalcNormals(me)
vert_tone = [0.0] * len(me.vertices)
min_tone = 180.0
max_tone = 0.0
# create lookup table for each vertex's connected vertices (via edges)
con = []
con = [[] for i in range(len(me.vertices))]
# add connected verts
for e in me.edges:
con[e.vertices[0]].append(e.vertices[1])
con[e.vertices[1]].append(e.vertices[0])
for i, v in enumerate(me.vertices):
vec = Vector()
no = v.normal
co = v.co
# get the direction of the vectors between the vertex and it's connected vertices
for c in con[i]:
vec += (me.vertices[c].co - co).normalized()
# normalize the vector by dividing by the number of connected verts
tot_con = len(con[i])
if tot_con == 0:
continue
vec /= tot_con
# angle is the acos() of the dot product between vert and connected verts normals
ang = acos(no.dot(vec))
# enforce min/max
ang = max(clamp_dirt, ang)
if not dirt_only:
ang = min(clamp_clean, ang)
vert_tone[i] = ang
# blur tones
for i in range(blur_iterations):
# backup the original tones
orig_vert_tone = list(vert_tone)
# use connected verts look up for blurring
for j, c in enumerate(con):
for v in c:
vert_tone[j] += blur_strength * orig_vert_tone[v]
vert_tone[j] /= len(c) * blur_strength + 1
min_tone = min(vert_tone)
max_tone = max(vert_tone)
# debug information
# print(min_tone * 2 * math.pi)
# print(max_tone * 2 * math.pi)
# print(clamp_clean)
# print(clamp_dirt)
tone_range = max_tone - min_tone
if not tone_range:
return
active_col_layer = None
if len(me.vertex_colors):
for lay in me.vertex_colors:
if lay.active:
active_col_layer = lay.data
else:
bpy.ops.mesh.vertex_color_add()
me.vertex_colors[0].active = True
active_col_layer = me.vertex_colors[0].data
if not active_col_layer:
return('CANCELLED', )
for i, f in enumerate(me.faces):
if not me.use_paint_mask or f.select:
f_col = active_col_layer[i]
f_col = [f_col.color1, f_col.color2, f_col.color3, f_col.color4]
for j, v in enumerate(f.vertices):
col = f_col[j]
tone = vert_tone[me.vertices[v].index]
tone = (tone - min_tone) / tone_range
if dirt_only:
tone = min(tone, 0.5)
tone *= 2
col[0] = tone * col[0]
col[1] = tone * col[1]
col[2] = tone * col[2]
import bpy
from bpy.types import Operator
from bpy.props import FloatProperty, IntProperty, BoolProperty
class VertexPaintDirt(Operator):
bl_idname = "paint.vertex_color_dirt"
bl_label = "Dirty Vertex Colors"
bl_options = {'REGISTER', 'UNDO'}
blur_strength = FloatProperty(
name="Blur Strength",
description="Blur strength per iteration",
min=0.01, max=1.0,
default=1.0,
)
blur_iterations = IntProperty(
name="Blur Iterations",
description="Number of times to blur the colors (higher blurs more)",
min=0, max=40,
default=1,
)
clean_angle = FloatProperty(
name="Highlight Angle",
description="Less then 90 limits the angle used in the tonal range",
min=0.0, max=180.0,
default=180.0,
)
dirt_angle = FloatProperty(
name="Dirt Angle",
description="Less then 90 limits the angle used in the tonal range",
min=0.0, max=180.0,
default=0.0,
)
dirt_only = BoolProperty(
name="Dirt Only",
description="Dont calculate cleans for convex areas",
default=False,
)
def execute(self, context):
import time
from math import radians
obj = context.object
if not obj or obj.type != 'MESH':
self.report({'ERROR'}, "Error, no active mesh object, aborting")
return {'CANCELLED'}
mesh = obj.data
t = time.time()
applyVertexDirt(mesh, self.blur_iterations, self.blur_strength, radians(self.dirt_angle), radians(self.clean_angle), self.dirt_only)
print('Dirt calculated in %.6f' % (time.time() - t))
return {'FINISHED'}
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