def parse_shape(self, geometry):
# compute the tessellation
tess = ShapeTesselator(geometry)
tess.Compute(compute_edges=True)
# tess.Compute(compute_edges=False, mesh_quality=1.0, parallel=True)
# get the vertices
vertices = []
vertex_count = tess.ObjGetVertexCount()
for i_vertex in range(0, vertex_count):
i1, i2, i3 = tess.GetVertex(i_vertex)
vertices.append(i1)
vertices.append(i2)
vertices.append(i3)
# get the normals
normals = []
normals_count = tess.ObjGetNormalCount()
for i_normal in range(0, normals_count):
i1, i2, i3 = tess.GetNormal(i_normal)
normals.append(i1)
normals.append(i2)
normals.append(i3)
# get the triangles
triangles = []
triangle_count = tess.ObjGetTriangleCount()
for i_triangle in range(0, triangle_count):
i1, i2, i3 = tess.GetTriangleIndex(i_triangle)
triangles.append(i1)
triangles.append(i2)
triangles.append(i3)
# get the edges
edges = []
edge_count = tess.ObjGetEdgeCount()
for i_edge in range(0, edge_count):
vertex_count = tess.ObjEdgeGetVertexCount(i_edge)
# edge = []
for i_vertex in range(0, vertex_count):
vertex = tess.GetEdgeVertex(i_edge, i_vertex)
# edge.append(vertex)
# edges.append(i_vertex)
edges.append(vertex[0])
edges.append(vertex[1])
edges.append(vertex[2])
# edges.append(edge)
return vertices, normals, triangles, edges
def occ_shape_to_faces(
shape: "TopoDS_Shape",
quality=1.0,
render_edges=False,
parallel=True
) -> Tuple[np.ndarray, np.ndarray, np.ndarray, Union[None, np.ndarray]]:
from OCC.Core.Tesselator import ShapeTesselator
# first, compute the tesselation
try:
tess = ShapeTesselator(shape)
except RuntimeError as e:
raise UnableToCreateTesselationFromSolidOCCGeom(e)
tess.Compute(compute_edges=render_edges,
mesh_quality=quality,
parallel=parallel)
# get vertices and normals
vertices_position = tess.GetVerticesPositionAsTuple()
number_of_triangles = tess.ObjGetTriangleCount()
number_of_vertices = len(vertices_position)
# number of vertices should be a multiple of 3
if number_of_vertices % 3 != 0:
raise AssertionError("Wrong number of vertices")
if number_of_triangles * 9 != number_of_vertices:
raise AssertionError("Wrong number of triangles")
# then we build the vertex and faces collections as numpy ndarrays
np_vertices = np.array(vertices_position, dtype="float32").reshape(
int(number_of_vertices / 3), 3)
# Note: np_faces is just [0, 1, 2, 3, 4, 5, ...], thus arange is used
np_faces = np.arange(np_vertices.shape[0], dtype="uint32")
np_normals = np.array(tess.GetNormalsAsTuple(),
dtype="float32").reshape(-1, 3)
edges = np.array(
map(
lambda i_edge: [
tess.GetEdgeVertex(i_edge, i_vert)
for i_vert in range(tess.ObjEdgeGetVertexCount(i_edge))
],
range(tess.ObjGetEdgeCount()),
))
return np_vertices, np_faces, np_normals, edges
def compute(self):
shape_tesselator = ShapeTesselator(self._shape)
shape_tesselator.Compute(compute_edges=self._export_edges,
mesh_quality=self._mesh_quality,
parallel=True)
self._triangle_sets.append(
shape_tesselator.ExportShapeToX3DTriangleSet())
# then process edges
if self._export_edges:
# get number of edges
nbr_edges = shape_tesselator.ObjGetEdgeCount()
for i_edge in range(nbr_edges):
edge_point_set = []
nbr_vertices = shape_tesselator.ObjEdgeGetVertexCount(i_edge)
for i_vert in range(nbr_vertices):
edge_point_set.append(
shape_tesselator.GetEdgeVertex(i_edge, i_vert))
ils = export_edge_to_indexed_lineset(edge_point_set)
self._line_sets.append(ils)
def draw_shape_mpl(shape):
"""
Draw a TopoDS_Shape with matplotlib
"""
tess = ShapeTesselator(shape)
tess.Compute()
triangles = []
edges = []
# get the triangles
triangle_count = tess.ObjGetTriangleCount()
for i_triangle in range(0, triangle_count):
i1, i2, i3 = tess.GetTriangleIndex(i_triangle)
triangles.append(
[tess.GetVertex(i1),
tess.GetVertex(i2),
tess.GetVertex(i3)])
# get the edges
edge_count = tess.ObjGetEdgeCount()
for i_edge in range(0, edge_count):
vertex_count = tess.ObjEdgeGetVertexCount(i_edge)
edge = []
for i_vertex in range(0, vertex_count):
vertex = tess.GetEdgeVertex(i_edge, i_vertex)
edge.append(vertex)
edges.append(edge)
# plot it
fig = plt.figure()
ax = Axes3D(fig)
ax.add_collection3d(Poly3DCollection(triangles, linewidths=0.2, alpha=0.5))
ax.add_collection3d(Line3DCollection(edges, colors='w', linewidths=1.0))
ax.get_xaxis().set_visible(True)
ax.get_yaxis().set_visible(True)
ax.set_autoscale_on(True)
plt.show()
def DisplayShape(self,
shape,
export_edges=False,
color=(0.65, 0.65, 0.7),
specular_color=(0.2, 0.2, 0.2),
shininess=0.9,
transparency=0.,
line_color=(0, 0., 0.),
line_width=1.,
mesh_quality=1.):
# if the shape is an edge or a wire, use the related functions
if is_edge(shape):
print("discretize an edge")
pnts = discretize_edge(shape)
edge_hash = "edg%s" % uuid.uuid4().hex
str_to_write = export_edgedata_to_json(edge_hash, pnts)
edge_full_path = os.path.join(self._path, edge_hash + '.json')
with open(edge_full_path, "w") as edge_file:
edge_file.write(str_to_write)
# store this edge hash
self._3js_edges[edge_hash] = [color, line_width]
return self._3js_shapes, self._3js_edges
elif is_wire(shape):
print("discretize a wire")
pnts = discretize_wire(shape)
wire_hash = "wir%s" % uuid.uuid4().hex
str_to_write = export_edgedata_to_json(wire_hash, pnts)
wire_full_path = os.path.join(self._path, wire_hash + '.json')
with open(wire_full_path, "w") as wire_file:
wire_file.write(str_to_write)
# store this edge hash
self._3js_edges[wire_hash] = [color, line_width]
return self._3js_shapes, self._3js_edges
shape_uuid = uuid.uuid4().hex
shape_hash = "shp%s" % shape_uuid
# tesselate
tess = ShapeTesselator(shape)
tess.Compute(compute_edges=export_edges,
mesh_quality=mesh_quality,
parallel=True)
# update spinning cursor
sys.stdout.write("\r%s mesh shape %s, %i triangles " % (next(
self.spinning_cursor), shape_hash, tess.ObjGetTriangleCount()))
sys.stdout.flush()
# export to 3JS
shape_full_path = os.path.join(self._path, shape_hash + '.json')
# add this shape to the shape dict, sotres everything related to it
self._3js_shapes[shape_hash] = [
export_edges, color, specular_color, shininess, transparency,
line_color, line_width
]
# generate the mesh
#tess.ExportShapeToThreejs(shape_hash, shape_full_path)
# and also to JSON
with open(shape_full_path, 'w') as json_file:
json_file.write(tess.ExportShapeToThreejsJSONString(shape_uuid))
# draw edges if necessary
if export_edges:
# export each edge to a single json
# get number of edges
nbr_edges = tess.ObjGetEdgeCount()
for i_edge in range(nbr_edges):
# after that, the file can be appended
str_to_write = ''
edge_point_set = []
nbr_vertices = tess.ObjEdgeGetVertexCount(i_edge)
for i_vert in range(nbr_vertices):
edge_point_set.append(tess.GetEdgeVertex(i_edge, i_vert))
# write to file
edge_hash = "edg%s" % uuid.uuid4().hex
str_to_write += export_edgedata_to_json(
edge_hash, edge_point_set)
# create the file
edge_full_path = os.path.join(self._path, edge_hash + '.json')
with open(edge_full_path, "w") as edge_file:
edge_file.write(str_to_write)
# store this edge hash, with black color
self._3js_edges[edge_hash] = [(0, 0, 0), line_width]
return self._3js_shapes, self._3js_edges
def AddShapeToScene(
self,
shp,
shape_color=None, # the default
render_edges=False,
edge_color=None,
vertex_color=None,
quality=1.0,
transparency=False,
opacity=1.0,
):
# first, compute the tesselation
tess = ShapeTesselator(shp)
tess.Compute(compute_edges=render_edges,
mesh_quality=quality,
parallel=True)
# get vertices and normals
vertices_position = tess.GetVerticesPositionAsTuple()
number_of_triangles = tess.ObjGetTriangleCount()
number_of_vertices = len(vertices_position)
# number of vertices should be a multiple of 3
if number_of_vertices % 3 != 0:
raise AssertionError("Wrong number of vertices")
if number_of_triangles * 9 != number_of_vertices:
raise AssertionError("Wrong number of triangles")
# then we build the vertex and faces collections as numpy ndarrays
np_vertices = np.array(vertices_position, dtype="float32").reshape(
int(number_of_vertices / 3), 3)
# Note: np_faces is just [0, 1, 2, 3, 4, 5, ...], thus arange is used
np_faces = np.arange(np_vertices.shape[0], dtype="uint32")
# set geometry properties
buffer_geometry_properties = {
"position": BufferAttribute(np_vertices),
"index": BufferAttribute(np_faces),
}
if self._compute_normals_mode == NORMAL.SERVER_SIDE:
# get the normal list, converts to a numpy ndarray. This should not raise
# any issue, since normals have been computed by the server, and are available
# as a list of floats
np_normals = np.array(tess.GetNormalsAsTuple(),
dtype="float32").reshape(-1, 3)
# quick check
if np_normals.shape != np_vertices.shape:
raise AssertionError("Wrong number of normals/shapes")
buffer_geometry_properties["normal"] = BufferAttribute(np_normals)
# build a BufferGeometry instance
shape_geometry = BufferGeometry(attributes=buffer_geometry_properties)
# if the client has to render normals, add the related js instructions
if self._compute_normals_mode == NORMAL.CLIENT_SIDE:
shape_geometry.exec_three_obj_method("computeVertexNormals")
# then a default material
shp_material = self._material(shape_color,
transparent=transparency,
opacity=opacity)
# and to the dict of shapes, to have a mapping between meshes and shapes
mesh_id = "%s" % uuid.uuid4().hex
self._shapes[mesh_id] = shp
# finally create the mesh
shape_mesh = Mesh(geometry=shape_geometry,
material=shp_material,
name=mesh_id)
# edge rendering, if set to True
if render_edges:
edges = list(
map(
lambda i_edge: [
tess.GetEdgeVertex(i_edge, i_vert)
for i_vert in range(tess.ObjEdgeGetVertexCount(i_edge))
],
range(tess.ObjGetEdgeCount()),
))
edge_list = _flatten(list(map(_explode, edges)))
lines = LineSegmentsGeometry(positions=edge_list)
mat = LineMaterial(linewidth=1, color=edge_color)
edge_lines = LineSegments2(lines, mat, name=mesh_id)
self._displayed_non_pickable_objects.add(edge_lines)
return shape_mesh
def ConvertShape(
self,
shape,
export_edges=False,
color=(0.65, 0.65, 0.7),
specular_color=(0.2, 0.2, 0.2),
shininess=0.9,
transparency=0.0,
line_color=(0, 0.0, 0.0),
line_width=1.0,
point_size=1.0,
mesh_quality=1.0,
):
# if the shape is an edge or a wire, use the related functions
color = color_to_hex(color)
specular_color = color_to_hex(specular_color)
if is_edge(shape):
print("discretize an edge")
pnts = discretize_edge(shape)
edge_hash = "edg%s" % uuid.uuid4().hex
shape_content = export_edgedata_to_json(edge_hash, pnts)
# store this edge hash
self._3js_edges[edge_hash] = [color, line_width, shape_content]
return self._3js_shapes, self._3js_edges, self._3js_vertex
elif is_wire(shape):
print("discretize a wire")
pnts = discretize_wire(shape)
wire_hash = "wir%s" % uuid.uuid4().hex
shape_content = export_edgedata_to_json(wire_hash, pnts)
# store this edge hash
self._3js_edges[wire_hash] = [color, line_width, shape_content]
return self._3js_shapes, self._3js_edges, self._3js_vertex
# if shape is array of gp_Pnt
elif isinstance(shape, list) and isinstance(shape[0], gp_Pnt):
print("storage points")
vertices_list = [] # will be passed to javascript
BB = BRep_Builder()
compound = TopoDS_Compound()
BB.MakeCompound(compound)
for vertex in shape:
vertext_to_add = BRepBuilderAPI_MakeVertex(vertex).Shape()
BB.Add(compound, vertext_to_add)
vertices_list.append([vertex.X(), vertex.Y(), vertex.Z()])
points_hash = "pnt%s" % uuid.uuid4().hex
# store this vertex hash. Note: TopoDS_Compound did not save now
self._3js_vertex[points_hash] = [color, point_size, vertices_list]
return self._3js_shapes, self._3js_edges, self._3js_vertex
# convert as TopoDS_Shape
shape_uuid = uuid.uuid4().hex
shape_hash = "shp%s" % shape_uuid
# tesselate
tess = ShapeTesselator(shape)
tess.Compute(compute_edges=export_edges,
mesh_quality=mesh_quality,
parallel=True)
# update spinning cursor
sys.stdout.write("\r%s mesh shape %s, %i triangles " % (next(
self.spinning_cursor), shape_hash, tess.ObjGetTriangleCount()))
sys.stdout.flush()
# export to 3JS
# generate the mesh
shape_content = tess.ExportShapeToThreejsJSONString(shape_uuid)
# add this shape to the shape dict, sotres everything related to it
self._3js_shapes[shape_hash] = [
export_edges,
color,
specular_color,
shininess,
transparency,
line_color,
line_width,
shape_content,
]
# draw edges if necessary
if export_edges:
# export each edge to a single json
# get number of edges
nbr_edges = tess.ObjGetEdgeCount()
for i_edge in range(nbr_edges):
# after that, the file can be appended
edge_content = ""
edge_point_set = []
nbr_vertices = tess.ObjEdgeGetVertexCount(i_edge)
for i_vert in range(nbr_vertices):
edge_point_set.append(tess.GetEdgeVertex(i_edge, i_vert))
# write to file
edge_hash = "edg%s" % uuid.uuid4().hex
edge_content += export_edgedata_to_json(
edge_hash, edge_point_set)
# store this edge hash, with black color
self._3js_edges[edge_hash] = [
color_to_hex((0, 0, 0)),
line_width,
edge_content,
]
return self._3js_shapes, self._3js_edges, self._3js_vertex