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height.py
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height.py
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# ##### BEGIN GPL LICENSE BLOCK #####
#
# height.py , a Blender addon
# (c) 2013 Michel J. Anders (varkenvarken)
#
# 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>
bl_info = {
"name": "Height",
"author": "Michel Anders (varkenvarken)",
"version": (0, 0, 2),
"blender": (2, 68, 0),
"location": "View3D > Weights > Height and View3D > Paint > Height",
"description": "Replace active vertex group or vertex color layer with values representing the coordinates or height of the vertices",
"warning": "",
"wiki_url": "",
"tracker_url": "",
"category": "Mesh"}
from math import pow
from re import search
import bpy
from mathutils import Vector
class Height:
def extremes(self, mesh, wmat):
i = {"X": 0, "Y": 1, "Z": 2}[self.axis]
if self.abs:
if self.worldspace:
mind = min([abs((wmat * v.co)[i]) for v in mesh.vertices])
maxd = max([abs((wmat * v.co)[i]) for v in mesh.vertices])
else:
mind = min([abs(v.co[i]) for v in mesh.vertices])
maxd = max([abs(v.co[i]) for v in mesh.vertices])
else:
if self.worldspace:
mind = min([(wmat * v.co)[i] for v in mesh.vertices])
maxd = max([(wmat * v.co)[i] for v in mesh.vertices])
else:
mind = min([v.co[i] for v in mesh.vertices])
maxd = max([v.co[i] for v in mesh.vertices])
return mind, maxd
def map(self, coords, mind, maxd, wmat):
i = {"X": 0, "Y": 1, "Z": 2}[self.axis]
if self.worldspace:
d = (wmat * coords)[i]
else:
d = coords[i]
if self.abs:
d = abs(d)
w = pow((d - mind) / (maxd - mind), self.power)
if w < self.low:
w = 0
elif w > self.high:
w = 1
if self.invert:
w = 1 - w
return w
class Height2VGroup(bpy.types.Operator, Height):
bl_idname = "mesh.height2vgroup"
bl_label = "Height2VGroup"
bl_options = {'REGISTER', 'UNDO'}
low = bpy.props.FloatProperty(name="Lower limit", description="Relative distances smaller than this get a zero weight", unit='LENGTH', subtype="DISTANCE", default=0, min=0, max=1)
high = bpy.props.FloatProperty(name="Upper limit", description="Relative distances greater than this get a unit weight", unit='LENGTH', subtype="DISTANCE", default=1, min=0, max=1)
power = bpy.props.FloatProperty(name="Power", description="Shape of mapping curve", default=1, min=0, max=10)
abs = bpy.props.BoolProperty(name="Absolute", description="Treat negative distances as positive", default=False)
invert = bpy.props.BoolProperty(name="Invert", description="Invert the resulting values", default=False)
axis = bpy.props.EnumProperty(name="Axis", description="Axis along which the distance is measured",
items=[("X", "X-axis", "X-Axis"), ("Y", "Y-axis", "Y-Axis"), ("Z", "Z-axis", "Z-Axis")], default="Z")
worldspace = bpy.props.BoolProperty(name="World space", description="Use world space instead of object space coordinates", default=False)
@classmethod
def poll(self, context):
p = (context.mode == 'PAINT_WEIGHT' and
isinstance(context.scene.objects.active, bpy.types.Object) and
isinstance(context.scene.objects.active.data, bpy.types.Mesh))
return p
def execute(self, context):
bpy.ops.object.mode_set(mode='OBJECT')
ob = context.active_object
wmat = ob.matrix_world
vertex_group = ob.vertex_groups.active
if vertex_group is None:
bpy.ops.object.vertex_group_add()
vertex_group = ob.vertex_groups.active
mesh = ob.data
mind, maxd = self.extremes(mesh, wmat)
for v in mesh.vertices:
w = self.map(v.co, mind, maxd, wmat)
vertex_group.add([v.index], w, 'REPLACE')
bpy.ops.object.mode_set(mode='WEIGHT_PAINT')
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.object.mode_set(mode='WEIGHT_PAINT')
context.scene.update()
return {'FINISHED'}
class Height2VCol(bpy.types.Operator, Height):
bl_idname = "mesh.height2vcol"
bl_label = "Height2VCol"
bl_options = {'REGISTER', 'UNDO'}
low = bpy.props.FloatProperty(name="Lower limit", description="Relative distances smaller than this get a zero weight", unit='LENGTH', subtype="DISTANCE", default=0, min=0, max=1)
high = bpy.props.FloatProperty(name="Upper limit", description="Relative distances greater than this get a unit weight", unit='LENGTH', subtype="DISTANCE", default=1, min=0, max=1)
power = bpy.props.FloatProperty(name="Power", description="Shape of mapping curve", default=1, min=0, max=10)
abs = bpy.props.BoolProperty(name="Absolute", description="Treat negative distances as positive", default=False)
invert = bpy.props.BoolProperty(name="Invert", description="Invert the resulting values", default=False)
axis = bpy.props.EnumProperty(name="Axis", description="Axis along which the distance is measured",
items=[("X", "X-axis", "X-Axis"), ("Y", "Y-axis", "Y-Axis"), ("Z", "Z-axis", "Z-Axis")], default="Z")
worldspace = bpy.props.BoolProperty(name="World space", description="Use world space instead of object space coordinates", default=False)
curve = bpy.props.BoolProperty(name="Use brush curve", description="Apply brush curve after calculculating values", default=False)
@classmethod
def poll(self, context):
p = (context.mode == 'PAINT_VERTEX' and
isinstance(context.scene.objects.active, bpy.types.Object) and
isinstance(context.scene.objects.active.data, bpy.types.Mesh))
return p
def draw(self, context): # provide a draw function here to show use brush option only with versions that have the new initialize function
layout = self.layout
if not self.curve:
layout.prop(self, 'low')
layout.prop(self, 'high')
layout.prop(self, 'power')
layout.prop(self, 'abs')
layout.prop(self, 'invert')
layout.prop(self, 'axis')
layout.prop(self, 'worldspace')
# checking for a specific build is a bit tricky as it may contain other chars than just digits
if int(search(r'\d+', str(bpy.app.build_revision)).group(0)) > 60054:
layout.prop(self, 'curve')
if self.curve:
layout.label('Click Paint -> Height to see effect after changing brush curve')
def execute(self, context):
if self.curve:
# see: https://projects.blender.org/tracker/index.php?func=detail&aid=36688
bcurvemap = context.tool_settings.vertex_paint.brush.curve
bcurvemap.initialize()
bcurve = bcurvemap.curves[0]
wmat = context.scene.objects.active.matrix_world
mesh = context.scene.objects.active.data
vertex_colors = mesh.vertex_colors.active.data
mind, maxd = self.extremes(mesh, wmat)
for poly in mesh.polygons:
for loop_index in range(poly.loop_start, poly.loop_start + poly.loop_total):
# use average coordinate of face. Why Vector()? well sometimes Blender's Pyhthon API
# is not very orthogonal. It beats me why Vertex.co is a vector and MeshPolygon.center isn't ...
weight = self.map(Vector(poly.center), mind, maxd, wmat)
if self.curve:
weight = bcurve.evaluate(1.0 - weight)
vertex_colors[loop_index].color = [weight, weight, weight]
bpy.ops.object.mode_set(mode='VERTEX_PAINT')
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.object.mode_set(mode='VERTEX_PAINT')
context.scene.update()
return {'FINISHED'}
def menu_func_weight(self, context):
self.layout.operator(Height2VGroup.bl_idname, text="Height",
icon='PLUGIN')
def menu_func_vcol(self, context):
self.layout.operator(Height2VCol.bl_idname, text="Height",
icon='PLUGIN')
def register():
bpy.utils.register_class(Height2VGroup)
bpy.utils.register_class(Height2VCol)
bpy.types.VIEW3D_MT_paint_vertex.append(menu_func_vcol)
bpy.types.VIEW3D_MT_paint_weight.append(menu_func_weight)
def unregister():
bpy.types.IVIEW3D_MT_paint_weight.remove(menu_func_weight)
bpy.types.VIEW3D_MT_paint_vertex.remove(menu_func_vcol)
bpy.utils.unregister_class(Height2VGroup)
bpy.utils.unregister_class(Height2VCol)