def extract_plane_from_room(obj: MeshObject, used_split_height: float,
up_vec: mathutils.Vector,
new_name_for_obj: str):
"""
Extract a plane from the current room object. This uses the FloorExtractor Module functions
:param obj: The current room object
:param used_split_height: The height at which the split should be performed. Usually 0 or wall_height
:param up_vec: The up_vec corresponds to the face.normal of the selected faces
:param new_name_for_obj: This will be the new name of the created object
:return: (bool, bpy.types.Object): Returns True if the object was split and also returns the object. \
Else it returns (False, None).
"""
compare_height = 0.15
compare_angle = math.radians(7.5)
obj.edit_mode()
bpy.ops.mesh.select_all(action='DESELECT')
bm = obj.mesh_as_bmesh()
bm.faces.ensure_lookup_table()
# Select faces at given height that should be separate from the mesh
counter = FloorExtractor.select_at_height_value(
bm, used_split_height, compare_height,
mathutils.Vector(up_vec), compare_angle,
obj.get_local2world_mat())
# if any faces are selected split them up
if counter:
bpy.ops.mesh.separate(type='SELECTED')
obj.update_from_bmesh(bm)
obj.object_mode()
cur_selected_objects = bpy.context.selected_objects
if cur_selected_objects:
if len(cur_selected_objects) == 2:
cur_selected_objects = [
o for o in cur_selected_objects
if o != bpy.context.view_layer.objects.active
]
cur_selected_objects[0].name = new_name_for_obj
cur_created_obj = MeshObject(cur_selected_objects[0])
else:
raise Exception(
"There is more than one selection after splitting, this should not happen!"
)
else:
raise Exception("No floor object was constructed!")
bpy.ops.object.select_all(action='DESELECT')
return True, cur_created_obj
else:
obj.object_mode()
bpy.ops.object.select_all(action='DESELECT')
return False, None
def cut_plane(plane: MeshObject):
"""
Cuts the floor plane in several pieces randomly. This is used for selecting random edges for the extrusions
later on. This function assumes the current `plane` object is already selected and no other object is
selected.
:param plane: The object, which should be split in edit mode.
"""
# save the size of the plane to determine a best split value
x_size = plane.get_scale()[0]
y_size = plane.get_scale()[1]
# switch to edit mode and select all faces
bpy.ops.object.mode_set(mode='EDIT')
bpy.ops.mesh.select_all(action='SELECT')
bpy.ops.object.mode_set(mode='OBJECT')
# convert plane to BMesh object
bm = plane.mesh_as_bmesh(True)
bm.faces.ensure_lookup_table()
# find all selected edges
edges = [e for e in bm.edges if e.select]
biggest_face_id = np.argmax([f.calc_area() for f in bm.faces])
biggest_face = bm.faces[biggest_face_id]
# find the biggest face
faces = [f for f in bm.faces if f == biggest_face]
geom = []
geom.extend(edges)
geom.extend(faces)
# calculate cutting point
cutting_point = [
x_size * random.uniform(-1, 1), y_size * random.uniform(-1, 1),
0
]
# select a random axis to specify in which direction to cut
direction_axis = [1, 0, 0
] if random.uniform(0, 1) < 0.5 else [0, 1, 0]
# cut the plane and update the final mesh
bmesh.ops.bisect_plane(bm,
dist=0.01,
geom=geom,
plane_co=cutting_point,
plane_no=direction_axis)
plane.update_from_bmesh(bm)
