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object_grease_scatter.py
object_grease_scatter.py 12.66 KiB
# ##### BEGIN GPL LICENSE BLOCK #####
#
# 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 #####
# <pep8-80 compliant>
# Script copyright (C) Campbell Barton
bl_info = {
"name": "Grease Scatter Objects",
"author": "Campbell Barton",
"version": (0, 1),
"blender": (2, 58, 0),
"location": "3D View, Add Mesh",
"description": "Scatter a group of objects onto the active mesh using "
"the grease pencil lines",
"warning": "",
"wiki_url": "http://wiki.blender.org/index.php/Extensions:2.6/Py/"
"Scripts/Object/Grease_Scatter",
"support": 'OFFICIAL',
"category": "Object",
}
from mathutils import Vector, Matrix, Quaternion
from random import uniform, shuffle
import bpy
def _main(self,
obj,
group,
DENSITY=1.0,
SCALE=0.6,
RAND_LOC=0.8,
RAND_ALIGN=0.75,
):
from math import radians, pi
# OFS = 0.2
SEEK = 2.0 # distance for ray to seek
BAD_NORMAL = Vector((0.0, 0.0, -1.0))
WALL_LIMIT = radians(45.0)
mats = (Matrix.Rotation(radians(-45), 3, 'X'),
Matrix.Rotation(radians(+45), 3, 'X'),
Matrix.Rotation(radians(-45), 3, 'Y'),
Matrix.Rotation(radians(+45), 3, 'Y'),
Matrix.Rotation(radians(-45), 3, 'Z'),
Matrix.Rotation(radians(+45), 3, 'Z'),
)
Z_UP = Vector((0.0, 0.0, 1.0))
Y_UP = Vector((0.0, 1.0, 0.0))
if not group:
self.report({'WARNING'}, "Group '%s' not found" % obj.name)
return
def debug_edge(v1, v2):
mesh = bpy.data.meshes.new("Retopo")
mesh.from_pydata([v1, v2], [(0.0, 1.0)], [])
scene = bpy.context.scene
mesh.update()
obj_new = bpy.data.objects.new("Torus", mesh)
scene.objects.link(obj_new)
ray = obj.ray_cast
closest_point_on_mesh = obj.closest_point_on_mesh
obj_mat = obj.matrix_world.copy()
obj_mat_inv = obj_mat.inverted()
# obj_quat = obj_mat.to_quaternion()
# obj_quat_inv = obj_mat_inv.to_quaternion()
DEBUG = False
def fix_point(p):
hit, no, ind = closest_point_on_mesh(obj_mat_inv * p)
if ind != -1:
if DEBUG:
return [p, no, None]
else:
# print("good", hit, no)
return [hit, no, None]
# worry!
print("bad!", p, BAD_NORMAL)
return [p, BAD_NORMAL, None]
def get_points(stroke):
return [fix_point(point.co) for point in stroke.points]
def get_splines(gp):
if gp.layers.active:
frame = gp.layers.active.active_frame
return [get_points(stroke) for stroke in frame.strokes]
else:
return []
def main():
scene = bpy.context.scene
obj = bpy.context.object
gp = None
if obj:
gp = obj.grease_pencil
if not gp:
gp = scene.grease_pencil
if not gp:
self.report({'WARNING'}, "No grease pencil layer found")
return
splines = get_splines(gp)
for s in splines:
for pt in s:
p = pt[0]
n = pt[1]
# print(p, n)
if n is BAD_NORMAL:
continue
# # dont self intersect
best_nor = None
#best_hit = None
best_dist = 10000000.0
pofs = p + n * 0.01
n_seek = n * SEEK
m_alt_1 = Matrix.Rotation(radians(22.5), 3, n)
m_alt_2 = Matrix.Rotation(radians(-22.5), 3, n)
for _m in mats:
for m in (_m, m_alt_1 * _m, m_alt_2 * _m):
hit, nor, ind = ray(pofs, pofs + (m * n_seek))
if ind != -1:
dist = (pofs - hit).length
if dist < best_dist:
best_dist = dist
best_nor = nor
#best_hit = hit
if best_nor:
pt[1].length = best_dist
best_nor.negate()
pt[2] = best_nor
#scene.cursor_location[:] = best_hitnyway
# bpy.ops.wm.redraw_timer(type='DRAW_WIN_SWAP',
# iterations=1)
# debug_edge(p, best_hit)
# p[:] = best_hit
# Now we need to do scattering.
# first corners
hits = []
nors = []
oris = []
for s in splines:
# point, normal, n_other the closest hit normal
for p, n, n_other in s:
if n is BAD_NORMAL:
continue
if n_other:
# cast vectors twice as long as the distance
# needed just in case.
n_down = (n * -SEEK)
l = n_down.length
n_other.length = l
vantage = p + n
if DEBUG:
p[:] = vantage
# We should cast rays between n_down and n_other
#for f in (0.0, 0.2, 0.4, 0.6, 0.8, 1.0):
TOT = int(10 * DENSITY)
#for i in list(range(TOT)):
for i in list(range(TOT))[int(TOT / 1.5):]: # second half
f = i / (TOT - 1)
# focus on the center
'''
f -= 0.5
f = f*f
f += 0.5
'''
ntmp = f * n_down + (1.0 - f) * n_other
# randomize
ntmp.x += uniform(-l, l) * RAND_LOC
ntmp.y += uniform(-l, l) * RAND_LOC
ntmp.z += uniform(-l, l) * RAND_LOC
hit, hit_no, ind = ray(vantage, vantage + ntmp)
# print(hit, hit_no)
if ind != -1:
if hit_no.angle(Z_UP) < WALL_LIMIT:
hits.append(hit)
nors.append(hit_no)
oris.append(n_other.cross(hit_no))
#oris.append(n_other)
if 0:
mesh = bpy.data.meshes.new("ScatterDupliFace")
mesh.from_pydata(hits, [], [])
scene = bpy.context.scene
mesh.update()
obj_new = bpy.data.objects.new("ScatterPar", mesh)
scene.objects.link(obj_new)
obj_new.layers[:] = obj.layers
# Now setup dupli-faces
obj_new.dupli_type = 'VERTS'
ob_child = bpy.data.objects["trash"]
ob_child.location = obj_new.location
ob_child.parent = obj_new
else:
def apply_faces(triples):
# first randomize the faces
shuffle(triples)
obs = group.objects[:]
tot = len(obs)
tot_div = int(len(triples) / tot)
for inst_ob in obs:
triple_sub = triples[0:tot_div]
triples[0:tot_div] = []
vv = [tuple(v) for f in triple_sub for v in f]
mesh = bpy.data.meshes.new("ScatterDupliFace")
mesh.from_pydata(vv, [], [(i * 3, i * 3 + 1, i * 3 + 2)
for i in range(len(triple_sub))])
scene = bpy.context.scene
mesh.update()
obj_new = bpy.data.objects.new("ScatterPar", mesh)
scene.objects.link(obj_new)
obj_new.layers[:] = obj.layers
# Now setup dupli-faces
obj_new.dupli_type = 'FACES'
obj_new.use_dupli_faces_scale = True
obj_new.dupli_faces_scale = 100.0
inst_ob.location = 0.0, 0.0, 0.0
inst_ob.parent = obj_new
# align the object with worldspace
obj_new.matrix_world = obj_mat
# BGE settings for testing
'''
inst_ob.game.physics_type = 'RIGID_BODY'
inst_ob.game.use_collision_bounds = True
inst_ob.game.collision_bounds = 'TRIANGLE_MESH'
inst_ob.game.collision_margin = 0.1
obj_new.select = True
'''
# build faces from vert/normals
tri = (Vector((0.0, 0.0, 0.01)),
Vector((0.0, 0.0, 0.0)),
Vector((0.0, 0.01, 0.01)))
coords = []
# face_ind = []
for i in range(len(hits)):
co = hits[i]
no = nors[i]
ori = oris[i]
quat = no.to_track_quat('X', 'Z')
# make 2 angles and blend
angle = uniform(-pi, pi)
angle_aligned = -(ori.angle(quat * Y_UP, pi))
quat = Quaternion(no,
(angle * (1.0 - RAND_ALIGN)) +
(angle_aligned * RAND_ALIGN)
).cross(quat)
f = uniform(0.1, 1.2) * SCALE
coords.append([co + (quat * (tri[0] * f)),
co + (quat * (tri[1] * f)),
co + (quat * (tri[2] * f)),
])
apply_faces(coords)
main()
from bpy.props import FloatProperty, StringProperty
class Scatter(bpy.types.Operator):
""""""
bl_idname = "object.scatter"
bl_label = "Grease Pencil Scatter"
density = FloatProperty(
name="Density",
description="Multiplier for the density of items",
default=1.0, min=0.01, max=10.0,
)
scale = FloatProperty(
name="Scale",
description="Size multiplier for duplifaces",
default=1.0, min=0.01, max=10.0,
)
rand_align = FloatProperty(
name="Random Align",
description="Randomize alignment with the walls",
default=0.75, min=0.0, max=1.0,
)
rand_loc = FloatProperty(
name="Random Loc",
description="Randomize placement",
default=0.75, min=0.0, max=1.0,
)
# XXX, should not be a string - TODO, add a way for scritps to select ID's
group = StringProperty(
name="Group",
description=("Group name to use for object placement, "
"defaults to object name when that matches a group"))
def execute(self, context):
obj = bpy.context.object
group = bpy.data.groups.get(self.group)
if not group:
self.report({'ERROR'}, "Group %r not found" % self.group)
return {'CANCELLED'}
_main(self,
obj,
group,
DENSITY=self.density,
SCALE=self.scale,
RAND_LOC=self.rand_loc,
RAND_ALIGN=self.rand_align,
)
return {'FINISHED'}
def check(self, context):
if self.group not in bpy.data.groups:
self.group = ""
return True
return False
def invoke(self, context, event):
# useful to initialize, take a guess
if not self.group and context.object.name in bpy.data.groups:
self.group = context.object.name
wm = context.window_manager
wm.invoke_props_dialog(self, width=180)
return {'RUNNING_MODAL'}
def menu_func(self, context):
self.layout.operator(Scatter.bl_idname, icon='AUTO')
def register():
bpy.utils.register_class(Scatter)
bpy.types.INFO_MT_mesh_add.append(menu_func)
def unregister():
bpy.utils.unregister_class(Scatter)
bpy.types.INFO_MT_mesh_add.remove(menu_func)
#if __name__ == "__main__":
# _main()