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ladder_05.py
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ladder_05.py
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# ##### BEGIN GPL LICENSE BLOCK #####
#
# Ladder, a Blender addon
# (c) 2016 - 2021 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 #####
bl_info = {
"name": "Ladder",
"author": "Michel Anders (varkenvarken)",
"version": (0, 0, 202104261101),
"blender": (2, 92, 0),
"location": "View3D > Add > Mesh > Ladder",
"description": "Adds a ladder mesh object to the scene",
"warning": "",
"wiki_url": "",
"tracker_url": "",
"category": "Add Mesh"}
import bpy
import bmesh
from bpy_extras import object_utils
from bpy.props import FloatProperty, IntProperty, BoolProperty
from bpy.app.handlers import persistent
from mathutils import Vector
vertsStile = [(-0.07573,0.03,-0.05),(-0.07573,0.03,0.05),(-0.04975,0.015,-0.05),(-0.04975,0.015,0.05),(-0.04975,-0.015,-0.05),(-0.04975,-0.015,0.05),(-0.07573,-0.03,-0.05),(-0.07573,-0.03,0.05),(-0.1017,-0.015,-0.05),(-0.1017,-0.015,0.05),(-0.1017,0.015,-0.05),(-0.1017,0.015,0.05),(-0.07573,0.03,-0.01667),(-0.07573,0.03,0.01667),(-0.04975,0.015,0.01667),(-0.04975,0.015,-0.01667),(-0.04975,-0.015,0.01667),(-0.04975,-0.015,-0.01667),(-0.07573,-0.03,0.01667),(-0.07573,-0.03,-0.01667),(-0.1017,-0.015,0.01667),(-0.1017,-0.015,-0.01667),(-0.1017,0.015,0.01667),(-0.1017,0.015,-0.01667),]
facesStile = [(13, 1, 3, 14),(14, 3, 5, 16),(16, 5, 7, 18),(18, 7, 9, 20),(20, 9, 11, 22),(22, 11, 1, 13),(10, 23, 12, 0),(23, 22, 13, 12),(8, 21, 23, 10),(21, 20, 22, 23),(6, 19, 21, 8),(19, 18, 20, 21),(4, 17, 19, 6),(17, 16, 18, 19),(2, 15, 17, 4),(0, 12, 15, 2),(12, 13, 14, 15),]
edgesStile = [(2, 0),(13, 1),(1, 3),(15, 2),(4, 2),(3, 5),(17, 4),(6, 4),(5, 7),(19, 6),(8, 6),(7, 9),(21, 8),(10, 8),(9, 11),(23, 10),(0, 10),(11, 1),(0, 12),(12, 13),(3, 14),(14, 15),(5, 16),(16, 17),(7, 18),(18, 19),(9, 20),(20, 21),(11, 22),(22, 23),(23, 12),(22, 13),(21, 23),(20, 22),(19, 21),(18, 20),(17, 19),(16, 18),(15, 17),(14, 16),(12, 15),(13, 14),]
creaseStile = {0: 0.0,1: 0.0,2: 0.0,3: 0.0,4: 0.0,5: 0.0,6: 0.0,7: 0.0,8: 0.0,9: 0.0,10: 0.0,11: 0.0,12: 0.0,13: 0.0,14: 0.0,15: 0.0,16: 0.0,17: 0.0,18: 0.0,19: 0.0,20: 0.0,21: 1.0,22: 0.0,23: 1.0,24: 0.0,25: 0.0,26: 0.0,27: 0.0,28: 0.0,29: 0.0,30: 0.0,31: 0.0,32: 0.0,33: 0.0,34: 0.0,35: 0.0,36: 0.0,37: 0.0,38: 1.0,39: 1.0,40: 0.0,41: 0.0,}
selectedStile = {0: True,1: False,2: True,3: False,4: True,5: True,6: False,7: True,8: True,9: False,10: True,11: True,12: False,13: True,14: True,15: False,16: True,17: True,18: False,19: False,20: False,21: False,22: False,23: False,24: False,25: False,26: False,27: False,28: False,29: False,30: False,31: False,32: False,33: False,34: False,35: False,36: False,37: False,38: False,39: False,40: False,41: False,}
vertsRung = [(0,0.0187,0.01781),(0,0.0187,-0.01552),(0,-0.0113,0.01781),(0,-0.0113,-0.01552),]
edgesRung = [(0, 1),(2, 3),(1, 3),(0, 2),]
def geometry(unit_height, unit_width, repetitions, taper):
# create a new bmesh
bm = bmesh.new()
maxx = max(v[0] for v in vertsStile)
offset = unit_width/2 - abs(maxx)
height = max(v[2] for v in vertsStile) - min(v[2] for v in vertsStile)
max_height = repetitions * unit_height
hscale = unit_height / height
# first the stile segment
edge_loops = []
stile_select = set()
for v in vertsStile:
bm.verts.new((v[0] - offset, v[1], v[2]))
bm.verts.ensure_lookup_table()
bm.verts.index_update()
for n,e in enumerate(edgesStile):
edge = bm.edges.new([bm.verts[e[0]],bm.verts[e[1]]])
edge.select = selectedStile[n] # actually there's no need to keep these edges selected
if edge.select:
stile_select.add(e[0])
stile_select.add(e[1])
if creaseStile[n]>0 :
edge_loops.append(n)
bm.edges.ensure_lookup_table()
bm.edges.index_update()
# add a crease layer
cl = bm.edges.layers.crease.new()
for n,e in enumerate(bm.edges):
e[cl] = creaseStile[n] # note the counter intuitive indexing the edge is indexed by the layer
for f in facesStile:
bm.faces.new([bm.verts[fi] for fi in f])
for v in stile_select:
bm.verts[v].co.z *= hscale
# then the rung segment, which is just a square of 4 edges with no face
start_rung_verts = len(bm.verts)
start_rung_edges = len(bm.edges)
for v in vertsRung:
bm.verts.new(v)
bm.verts.ensure_lookup_table()
bm.verts.index_update()
for n,e in enumerate(edgesRung):
edge = bm.edges.new([bm.verts[e[0]+start_rung_verts], bm.verts[e[1]+start_rung_verts]])
edge_loops.append(n+start_rung_edges)
bm.edges.ensure_lookup_table()
bm.edges.index_update()
# bridge the 4 edges on the stile with those on the rung
bmesh.ops.bridge_loops(bm, edges=[bm.edges[e] for e in edge_loops])
bm.verts.ensure_lookup_table()
bm.edges.ensure_lookup_table()
bm.faces.ensure_lookup_table()
# copying will copy creases as well so we don't have to look at that
geom_orig = bm.verts[:] + bm.edges[:] + bm.faces[:]
for rep in range(1,repetitions):
ret = bmesh.ops.duplicate(bm, geom=geom_orig) # dest param not implemented in 2.76
for ele in ret["geom"]:
if isinstance(ele, bmesh.types.BMVert):
ele.co.z += unit_height * rep
# I am pretty sure that the duplicate bmop has taken care of this but just to be sure
bm.verts.ensure_lookup_table()
bm.edges.ensure_lookup_table()
bm.faces.ensure_lookup_table()
# make all faces appear smooth
for f in bm.faces:
f.smooth = True
# finally we skew the vertices, but only those that belong to the stiles
for v in bm.verts:
vtaper = (v.co.z / max_height) * (taper * 0.01)
if v.co.x < -0.001:
v.co.x += vtaper * unit_width/2
return bm
def updateLadderObject(ob):
me = ob.data
# add some geometry. we refer to different prop locations now!
bm = geometry( ob.ladder.height,
ob.ladder.width,
ob.ladder.rungs,
ob.ladder.taper)
# remove doubles (using a 'bmop' saves us from having to switch to edit mode and back later on)
# we pass a list of all vertices here
bmesh.ops.remove_doubles(bm, verts=bm.verts, dist=0.001)
# write the bmesh to the mesh
bm.to_mesh(me)
me.update()
bm.free() # free and prevent further access
# add mirror modifier and subsurface modifier if needed
mods = ob.modifiers
if 'Mirror' not in mods:
m = mods.new('Mirror','MIRROR')
m.use_axis = [True, False, False]
if 'Subsurf' not in mods:
m = mods.new('Subsurf','SUBSURF')
m.levels = 2
m.render_levels = 2
def updateLadder(self, context):
# this function is called from the operator or it is called if the redraw value changes in the panel
# when called from the panel, self is the active object, otherwise self is the operator but to prevent confusion
# we explicitely retrieve the active object
ob = context.active_object
updateLadderObject(ob)
class LadderPropertyGroup(bpy.types.PropertyGroup):
ladder: BoolProperty( name="Ladder", default=False)
taper : FloatProperty( name="Taper",
description="Perc. tapering towards top",
default=0, min=0, max=100,
subtype='PERCENTAGE',
update=updateLadder)
width : FloatProperty( name="Width",
description="Width of the ladder",
default=0.5, min=0.3, soft_max=.6,
unit='LENGTH',
update=updateLadder)
height: FloatProperty( name="Height",
description="Step height",
default=0.3, min=0.1, soft_max=.5,
unit='LENGTH',
update=updateLadder)
rungs : IntProperty( name="# Rungs",
description="Number of rungs",
default=12, min=1, soft_max=30,
update=updateLadder)
class LADDER_PT_Props(bpy.types.Panel):
bl_label = "Ladder"
bl_space_type = "VIEW_3D"
bl_region_type = "UI"
bl_category = "Ladder"
bl_options = {'DEFAULT_CLOSED'}
@classmethod
def poll(self, context):
# Check if we are in object mode (and we are dealing with a ladder object)
return ( context.mode == 'OBJECT'
and (context.active_object is not None)
and (context.active_object.ladder is not None)
and context.active_object.ladder.ladder )
def draw(self, context):
layout = self.layout
ob = context.active_object.ladder
layout.prop(ob, 'width')
layout.prop(ob, 'height')
layout.prop(ob, 'rungs')
layout.prop(ob, 'taper')
class Ladder(bpy.types.Operator, object_utils.AddObjectHelper):
"""Add a ladder mesh object to the scene"""
bl_idname = "mesh.ladder05"
bl_label = "Ladder"
bl_options = {'REGISTER', 'UNDO', 'PRESET'}
@classmethod
def poll(cls, context):
return context.mode == 'OBJECT'
def execute(self, context):
# create a new empty mesh
me = bpy.data.meshes.new(name='Ladder')
# link the object to the scene & make it active and selected
ob = object_utils.object_data_add(context, me, operator=self)
# mark it as a Ladder object
ob.ladder.ladder = True
# create the geometry based on properties in the Ladder panel
updateLadder(self, context)
return {'FINISHED'}
@persistent
def update_ladders(scene):
for ob in scene.objects:
if hasattr(ob,'ladder'):
if ob.ladder.ladder:
updateLadderObject(ob)
classes = [Ladder, LadderPropertyGroup, LADDER_PT_Props]
register_classes, unregister_classes = bpy.utils.register_classes_factory(classes)
def register():
register_classes()
# adding a pointer to a propertygroup will cause *every* object in the scene to have a pointer to a possibly empty propertygroup
# only when assigning to a member of this property group will this propertygroup itself be instantiated
bpy.types.Object.ladder = bpy.props.PointerProperty(type=LadderPropertyGroup)
bpy.types.VIEW3D_MT_add.append(menu_func)
# add a post frame change handler to update all ladder objects.
# w.o. it object properties can be animated but will not result in actual changes to the object.
# (this is still a known issue https://developer.blender.org/T48285 )
bpy.app.handlers.frame_change_post.append(update_ladders)
def unregister():
bpy.app.handlers.frame_change_post.remove(update_ladders)
bpy.types.VIEW3D_MT_add.remove(menu_func)
unregister_classes()
def menu_func(self, context):
self.layout.operator(Ladder.bl_idname, icon='PLUGIN')