def create_planar_paths(mesh, planes):
"""
Creates planar contours. Does not rely on external libraries.
It is currently the only method that can return identify OPEN versus CLOSED paths.
Parameters
----------
mesh: :class: 'compas.datastructures.Mesh'
The mesh to be sliced
planes: list, :class: 'compas.geometry.Plane'
"""
layers = []
with progressbar.ProgressBar(max_value=len(planes)) as bar:
for i, plane in enumerate(planes):
intersection = PlanarContours(mesh, plane)
intersection.compute()
paths = []
if len(intersection.sorted_point_clusters
) > 0 and intersection.is_valid:
for key in intersection.sorted_point_clusters:
is_closed = intersection.closed_paths_booleans[key]
path = Path(points=intersection.sorted_point_clusters[key],
is_closed=is_closed)
paths.append(path)
layers.append(Layer(paths))
bar.update(i)
return layers
def add_to_vertical_layers_manager(self, vertical_layers_manager):
for key in self.sorted_point_clusters:
pts = self.sorted_point_clusters[key]
if len(pts) > 3: # discard curves that are too small
path = Path(pts, is_closed=self.closed_paths_booleans[key])
vertical_layers_manager.add(path)
def create_overhang_texture(slicer, overhang_distance):
"""Creates a cool overhang texture"""
print("Creating cool texture")
for i, layer in enumerate(slicer.layers):
if i % 10 == 0 and i > 0:
# for every 10th layer, except for the brim
# print(layer)
for j, path in enumerate(layer.paths):
# print(path)
# create an empty layer in which we can store our modified points
new_path = []
for k, pt in enumerate(path.points):
# for every second point (only even points)
if k % 2 == 0:
# get the normal of the point in relation to the mesh
normal = get_normal_of_path_on_xy_plane(k,
pt,
path,
mesh=None)
# scale the vector by a number to move the point
normal_scaled = scale_vector(normal,
-overhang_distance)
# create a new point by adding the point and the normal vector
new_pt = add_vectors(pt, normal_scaled)
# recreate the new_pt values as compas_points
pt = Point(new_pt[0], new_pt[1], new_pt[2])
# append the points to the new path
new_path.append(pt)
# replace the current path with the new path that we just created
layer.paths[j] = Path(new_path, is_closed=path.is_closed)
def create_planar_paths_numpy(mesh, min_z, max_z, planes):
"""
Creates planar contours using the compas mesh_contours_numpy function. To be replaced with a better alternative
Considers all resulting paths as CLOSED paths
Parameters
----------
mesh : compas.datastructures.Mesh
A compas mesh.
min_z: float
max_z: float
planes: list, compas.geometry.Plane
"""
# initializes progress_bar for measuring progress
progress_bar = Bar('Slicing', max=len(planes), suffix='Layer %(index)i/%(max)i - %(percent)d%%')
levels = [plane.point[2] for plane in planes]
levels, np_layers = compas.datastructures.mesh_contours_numpy(mesh, levels=levels, density=20)
layers = []
for i, layer in enumerate(np_layers):
for path in layer:
paths_per_layer = []
for polygon2d in path:
points = [Point(p[0], p[1], levels[i]) for p in polygon2d[:-1]]
if len(points) > 0:
# threshold_closed = 25.0 # TODO: Threshold should not be hardcoded
# is_closed = distance_point_point(points[0], points[-1]) < threshold_closed
# print_points = [PrintPoint(pt=p, layer_height=layer_height) for p in points]
path = Path(points=points, is_closed=True)
paths_per_layer.append(path)
l = Layer(paths_per_layer)
layers.append(l)
# advance progressbar
progress_bar.next()
# finish progressbar
progress_bar.finish()
return layers
def get_layer_ppts(self, layer, base_boundary):
""" Creates the PrintPoints of a single layer."""
max_layer_height = get_param(self.parameters,
key='max_layer_height',
defaults_type='layers')
min_layer_height = get_param(self.parameters,
key='min_layer_height',
defaults_type='layers')
avg_layer_height = get_param(self.parameters, 'avg_layer_height',
'layers')
all_pts = [pt for path in layer.paths for pt in path.points]
closest_fks, projected_pts = utils.pull_pts_to_mesh_faces(
self.slicer.mesh, all_pts)
normals = [
Vector(*self.slicer.mesh.face_normal(fkey)) for fkey in closest_fks
]
count = 0
crv_to_check = Path(
base_boundary.points,
True) # creation of fake path for the lower boundary
layer_ppts = {}
for i, path in enumerate(layer.paths):
layer_ppts['path_%d' % i] = []
for p in path.points:
cp = closest_point_on_polyline(p,
Polyline(crv_to_check.points))
d = distance_point_point(cp, p)
ppt = PrintPoint(pt=p,
layer_height=avg_layer_height,
mesh_normal=normals[count])
ppt.closest_support_pt = Point(*cp)
ppt.distance_to_support = d
ppt.layer_height = max(min(d, max_layer_height),
min_layer_height)
ppt.up_vector = Vector(
*normalize_vector(Vector.from_start_end(cp, p)))
ppt.frame = ppt.get_frame()
layer_ppts['path_%d' % i].append(ppt)
count += 1
crv_to_check = path
return layer_ppts
def create_planar_paths_igl(mesh, n):
"""
Creates planar contours using the libigl function: https://libigl.github.io/libigl-python-bindings/igl_docs/#isolines
TODO: ??? It is currently the only method that can return identify OPEN versus CLOSED paths.
Parameters
----------
mesh: :class: 'compas.datastructures.Mesh'
The mesh to be sliced
n: number of contours
"""
utils.check_package_is_installed('igl')
import igl
v, f = mesh.to_vertices_and_faces()
ds = np.array([vertex[2] for vertex in v])
# save distances of each vertex from the floor: this will be the scalar field for the slicing operation.
# --- generate disconnected segments of isolines using the libigl function
v = np.array(v)
f = np.array(f)
isoV, isoE = igl.isolines(v, f, ds, n)
# --- group resulting segments per level
print('Grouping segments per level')
segments_per_level = {}
tol = 1e-6
for e in isoE:
v0 = isoV[e[0]]
v1 = isoV[e[1]]
assert(abs(v0[2] - v1[2]) < tol)
h = v0[2]
found = False
for key in segments_per_level:
if abs(key - h) < tol:
if e[0] != e[1]: # do not add null segments
segments_per_level[key].append(e)
found = True
if not found:
segments_per_level[h] = [e]
#assert(len(segments_per_level) == n)
utils.save_to_json(utils.point_list_to_dict(isoV), "/examples/1_planar_slicing_simple/data/output", 'isoV.json')
sorted_keys = [key for key in segments_per_level]
sorted(sorted_keys)
layers = []
# --- Create connectivity graph G for every group, and sort edges based on G
with progressbar.ProgressBar(max_value=len(segments_per_level)) as bar:
for index, key in enumerate(sorted_keys):
#print(' Creating connectivity for level z = ', key)
es = segments_per_level[key] # list of the current edges, which whose indices we are working below
G = nx.Graph()
connections_found = [[False, False] for _ in es]
for i, e in enumerate(es):
G.add_node(i) # node, attribute
for i, ei in enumerate(es): # ei here is the edge, not the index!
for side_i in range(2):
if not connections_found[i][side_i]:
for jj, ej in enumerate(es[i+1:]): # ej here is the edge, not the index!
j = i + jj + 1
for side_j in range(2):
if not connections_found[j][side_j]:
vi = isoV[ei[side_i]]
vj = isoV[ej[side_j]]
if distance_point_point_sqrd(vi, vj) < tol:
G.add_edge(i, j)
connections_found[i][side_i] = True
connections_found[j][side_j] = True
# sort connected components of G
sorted_indices_dict = sort_graph_connected_components(G)
# for i, s_key in enumerate(sorted_indices_dict):
# sorted_eis = sorted_indices_dict[s_key]
# this_segment_pts = []
#
# for j, ei in enumerate(sorted_eis):
# e = es[ei]
# # segment pts
# for k in range(2):
# this_segment_pts.append(isoV[e[k]])
#
# utils.save_to_json(utils.point_list_to_dict(this_segment_pts),
# "C:/dev/compas_slicer/examples/1_planar_slicing_simple/data/output", 'isoV.json')
# print('saved')
# get points list from sorted edge indices (for each connected component)
paths_pts = [[] for _ in sorted_indices_dict]
are_closed = [True for _ in sorted_indices_dict]
for i, s_key in enumerate(sorted_indices_dict):
sorted_indices = sorted_indices_dict[s_key]
for j, s_ei in enumerate(sorted_indices):
v0 = isoV[es[s_ei][0]]
v1 = isoV[es[s_ei][1]]
if j == 0:
s_ei_next = sorted_indices[j+1]
v0_next = isoV[es[s_ei_next][0]]
v1_next = isoV[es[s_ei_next][1]]
v_mid_next = (Point(*v0_next) + Point(*v1_next)) * 0.5
if distance_point_point_sqrd(v0, v_mid_next) < distance_point_point_sqrd(v1, v_mid_next):
paths_pts[i].extend([Point(*v1), Point(*v0)])
else:
paths_pts[i].extend([Point(*v0), Point(*v1)])
else:
v_prev = paths_pts[i][-1]
if distance_point_point_sqrd(v0, v_prev) < distance_point_point_sqrd(v1, v_prev):
paths_pts[i].append(Point(*v1))
else:
paths_pts[i].append(Point(*v0))
if distance_point_point_sqrd(paths_pts[i][0], paths_pts[i][1]) > tol:
are_closed[i] = False
paths = []
for i in range(len(sorted_indices_dict)):
paths.append(Path(points=paths_pts[i], is_closed=are_closed[i]))
layers.append(Layer(paths))
bar.update(index)
return layers
def generate_raft(slicer,
raft_offset=10,
distance_between_paths=10,
direction="xy_diagonal",
raft_layers=1,
raft_layer_height=None):
"""Creates a raft.
Parameters
----------
slicer: :class:`compas_slicer.slicers.BaseSlicer`
An instance of one of the compas_slicer.slicers.BaseSlicer classes.
raft_offset: float
Distance (in mm) that the raft should be offsetted from the first layer. Defaults to 10mm
distance_between_paths: float
Distance (in mm) between the printed lines of the raft. Defaults to 10mm
direction: str
x_axis: Create a raft aligned with the x_axis
y_axis: Create a raft aligned with the y_axis
xy_diagonal: Create a raft int the diagonal direction in the xy_plane
raft_layers: int
Number of raft layers to add. Defaults to 1
raft_layer_height: float
Layer height of the raft layers. Defaults to same value as used in the slicer.
"""
# check if a raft_layer_height is specified, if not, use the slicer.layer_height value
if not raft_layer_height:
raft_layer_height = slicer.layer_height
logger.info("Generating raft")
# find if slicer has vertical or horizontal layers, and select which paths are to be offset.
if isinstance(slicer.layers[0], compas_slicer.geometry.VerticalLayer): # Vertical layers
# then find all paths that lie on the print platform and make them brim.
paths_to_offset, _ = slicer.find_vertical_layers_with_first_path_on_base()
else: # Horizontal layers
# then replace the first layer with a raft layer.
paths_to_offset = slicer.layers[0].paths
# get flat lists of points in bottom layer
all_pts = []
for path in paths_to_offset:
for pt in path.points:
all_pts.append(pt)
# get xy bounding box of bottom layer and create offset
bb_xy = bounding_box_xy(all_pts)
bb_xy_offset = offset_polygon(bb_xy, -raft_offset)
# bring points in the xy_offset to the correct height
for pt in bb_xy_offset:
pt[2] = slicer.layers[0].paths[0].points[0][2]
# calculate x range, y range, and number of steps
x_range = abs(bb_xy_offset[0][0] - bb_xy_offset[1][0])
y_range = abs(bb_xy_offset[0][1] - bb_xy_offset[3][1])
# get maximum values of the bounding box
bb_max_x_right = bb_xy_offset[1][0]
bb_max_y_top = bb_xy_offset[3][1]
# get point in bottom left corner as raft start point
raft_start_pt = Point(bb_xy_offset[0][0], bb_xy_offset[0][1], bb_xy_offset[0][2])
# create starting line for diagonal direction
if direction == "xy_diagonal":
c = math.sqrt(2*(distance_between_paths**2))
pt1 = Point(raft_start_pt[0] + c, raft_start_pt[1], raft_start_pt[2])
pt2 = Point(pt1[0] - y_range, pt1[1] + y_range, pt1[2])
line = Line(pt1, pt2)
# move all points in the slicer up so that raft layers can be inserted
for i, layer in enumerate(slicer.layers):
for j, path in enumerate(layer.paths):
for k, pt in enumerate(path.points):
slicer.layers[i].paths[j].points[k] = Point(pt[0], pt[1], pt[2] + (raft_layers)*raft_layer_height)
for i in range(raft_layers):
iter = 0
raft_points = []
# create raft points depending on the chosen direction
while iter < 9999: # to avoid infinite while loop in case something is not correct
# ===============
# VERTICAL RAFT
# ===============
if direction == "y_axis":
raft_pt1 = Point(raft_start_pt[0] + iter*distance_between_paths, raft_start_pt[1], raft_start_pt[2] + i*raft_layer_height)
raft_pt2 = Point(raft_start_pt[0] + iter*distance_between_paths, raft_start_pt[1] + y_range, raft_start_pt[2] + i*raft_layer_height)
if raft_pt2[0] > bb_max_x_right or raft_pt1[0] > bb_max_x_right:
break
# ===============
# HORIZONTAL RAFT
# ===============
elif direction == "x_axis":
raft_pt1 = Point(raft_start_pt[0], raft_start_pt[1] + iter*distance_between_paths, raft_start_pt[2] + i*raft_layer_height)
raft_pt2 = Point(raft_start_pt[0] + x_range, raft_start_pt[1] + iter*distance_between_paths, raft_start_pt[2] + i*raft_layer_height)
if raft_pt2[1] > bb_max_y_top or raft_pt1[1] > bb_max_y_top:
break
# ===============
# DIAGONAL RAFT
# ===============
elif direction == "xy_diagonal":
# create offset of the initial diagonal line
offset_l = offset_line(line, iter*distance_between_paths, Vector(0, 0, -1))
# get intersections for the initial diagonal line with the left and bottom of the bb
int_left = intersection_line_line(offset_l, [bb_xy_offset[0], bb_xy_offset[3]])
int_bottom = intersection_line_line(offset_l, [bb_xy_offset[0], bb_xy_offset[1]])
# get the points at the intersections
raft_pt1 = Point(int_left[0][0], int_left[0][1], int_left[0][2] + i*raft_layer_height)
raft_pt2 = Point(int_bottom[0][0], int_bottom[0][1], int_bottom[0][2] + i*raft_layer_height)
# if the intersection goes beyond the height of the left side of the bounding box:
if int_left[0][1] > bb_max_y_top:
# create intersection with the top side
int_top = intersection_line_line(offset_l, [bb_xy_offset[3], bb_xy_offset[2]])
raft_pt1 = Point(int_top[0][0], int_top[0][1], int_top[0][2] + i*raft_layer_height)
# if intersection goes beyond the length of the top side, break
if raft_pt1[0] > bb_max_x_right:
break
# if the intersection goes beyond the length of the bottom side of the bounding box:
if int_bottom[0][0] > bb_max_x_right:
# create intersection with the right side
int_right = intersection_line_line(offset_l, [bb_xy_offset[1], bb_xy_offset[2]])
raft_pt2 = Point(int_right[0][0], int_right[0][1], int_right[0][2] + i*raft_layer_height)
# if intersection goes beyond the height of the right side, break
if raft_pt2[1] > bb_xy_offset[2][1]:
break
# append to list alternating
if iter % 2 == 0:
raft_points.extend((raft_pt1, raft_pt2))
else:
raft_points.extend((raft_pt2, raft_pt1))
iter += 1
# create raft layer
raft_layer = Layer([Path(raft_points, is_closed=False)])
raft_layer.is_raft = True
# insert raft layer in the correct position into the slicer
slicer.layers.insert(i, raft_layer)