194 lines
5.3 KiB
Python
194 lines
5.3 KiB
Python
# ***** BEGIN GPL LICENSE BLOCK *****
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#
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# Script copyright (C) Campbell J Barton
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# ***** END GPL LICENSE BLOCK *****
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# --------------------------------------------------------------------------
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# <pep8 compliant>
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def get_vcolor_layer_data(me):
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for lay in me.vertex_colors:
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if lay.active:
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return lay.data
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lay = me.vertex_colors.new()
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lay.active = True
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return lay.data
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def applyVertexDirt(me, blur_iterations, blur_strength, clamp_dirt, clamp_clean, dirt_only):
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from mathutils import Vector
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from math import acos
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import array
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vert_tone = array.array("f", [0.0]) * len(me.vertices)
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# create lookup table for each vertex's connected vertices (via edges)
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con = [[] for i in range(len(me.vertices))]
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# add connected verts
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for e in me.edges:
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con[e.vertices[0]].append(e.vertices[1])
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con[e.vertices[1]].append(e.vertices[0])
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for i, v in enumerate(me.vertices):
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vec = Vector()
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no = v.normal
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co = v.co
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# get the direction of the vectors between the vertex and it's connected vertices
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for c in con[i]:
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vec += (me.vertices[c].co - co).normalized()
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# average the vector by dividing by the number of connected verts
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tot_con = len(con[i])
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if tot_con == 0:
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continue
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vec /= tot_con
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# angle is the acos() of the dot product between normal and connected verts.
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# > 90 degrees: convex
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# < 90 degrees: concave
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ang = acos(no.dot(vec))
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# enforce min/max
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ang = max(clamp_dirt, ang)
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if not dirt_only:
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ang = min(clamp_clean, ang)
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vert_tone[i] = ang
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# blur tones
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for i in range(blur_iterations):
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# backup the original tones
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orig_vert_tone = vert_tone[:]
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# use connected verts look up for blurring
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for j, c in enumerate(con):
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for v in c:
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vert_tone[j] += blur_strength * orig_vert_tone[v]
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vert_tone[j] /= len(c) * blur_strength + 1
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del orig_vert_tone
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min_tone = min(vert_tone)
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max_tone = max(vert_tone)
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tone_range = max_tone - min_tone
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if tone_range < 0.0001:
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# weak, don't cancel, see T43345
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tone_range = 0.0
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else:
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tone_range = 1.0 / tone_range
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active_col_layer = get_vcolor_layer_data(me)
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if not active_col_layer:
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return {'CANCELLED'}
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use_paint_mask = me.use_paint_mask
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for i, p in enumerate(me.polygons):
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if not use_paint_mask or p.select:
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for loop_index in p.loop_indices:
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loop = me.loops[loop_index]
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v = loop.vertex_index
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col = active_col_layer[loop_index].color
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tone = vert_tone[v]
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tone = (tone - min_tone) * tone_range
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if dirt_only:
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tone = min(tone, 0.5) * 2.0
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col[0] = tone * col[0]
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col[1] = tone * col[1]
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col[2] = tone * col[2]
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me.update()
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return {'FINISHED'}
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from bpy.types import Operator
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from bpy.props import FloatProperty, IntProperty, BoolProperty
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from math import pi
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class VertexPaintDirt(Operator):
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bl_idname = "paint.vertex_color_dirt"
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bl_label = "Dirty Vertex Colors"
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bl_options = {'REGISTER', 'UNDO'}
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blur_strength: FloatProperty(
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name="Blur Strength",
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description="Blur strength per iteration",
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min=0.01, max=1.0,
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default=1.0,
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)
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blur_iterations: IntProperty(
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name="Blur Iterations",
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description="Number of times to blur the colors (higher blurs more)",
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min=0, max=40,
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default=1,
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)
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clean_angle: FloatProperty(
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name="Highlight Angle",
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description="Less than 90 limits the angle used in the tonal range",
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min=0.0, max=pi,
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default=pi,
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unit='ROTATION',
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)
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dirt_angle: FloatProperty(
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name="Dirt Angle",
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description="Less than 90 limits the angle used in the tonal range",
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min=0.0, max=pi,
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default=0.0,
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unit='ROTATION',
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)
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dirt_only: BoolProperty(
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name="Dirt Only",
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description="Don't calculate cleans for convex areas",
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default=False,
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)
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@classmethod
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def poll(cls, context):
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obj = context.object
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return (obj and obj.type == 'MESH')
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def execute(self, context):
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obj = context.object
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mesh = obj.data
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ret = applyVertexDirt(
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mesh,
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self.blur_iterations,
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self.blur_strength,
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self.dirt_angle,
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self.clean_angle,
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self.dirt_only,
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)
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return ret
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classes = (
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VertexPaintDirt,
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)
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