def tow_mesh(tow):
"""Creates mesh from tow coordinates to use for z offset projection
Iterates through points and forms segments from outer points
Parameters
----------
tow : Tow object
Tow object to be converted to mesh
Returns
-------
Trimesh
mesh representation of all points in tow
"""
outer_mesh = Trimesh()
# inner_mesh = Trimesh()
[L1, L2, L3, L4, L5] = tow.new_pts
for i in range(len(tow.new_pts[0]) - 1):
v1 = L5[i] # vertices has to be anticlockwise
v2 = L5[i + 1]
v3 = L4[i + 1]
v4 = L4[i]
v5 = L3[i + 1]
v6 = L3[i]
v7 = L2[i + 1]
v8 = L2[i]
v9 = L1[i + 1]
v10 = L1[i]
outer_mesh_segment = Trimesh(
vertices=[v1, v2, v3, v4, v5, v6, v7, v8, v9, v10],
faces=[[0, 1, 2], [2, 3, 0], [3, 2, 4], [3, 4, 5], [5, 4, 6],
[6, 7, 5], [7, 6, 8], [8, 9, 7]])
# inner_mesh_segment = Trimesh(vertices=[v5, v6, v7, v8], faces=[[0, 1, 2, 3]])
if i == 0:
outer_mesh = outer_mesh_segment
else:
outer_mesh = outer_mesh.__add__(outer_mesh_segment)
outer_mesh.merge_vertices()
return outer_mesh
def gen_intersecting_mesh(base_mesh, bodies):
"""Generates mesh of tows that are intersecting with ray offset
Parameters
----------
base_mesh : Trimesh
Mesh of exisiting tows already laid down
bodies: set(int)
Indexes of bodies intersecting with the new tow
Returns
-------
Trimesh
Subset of base_mesh, containing only the tows from bodies
"""
# Create copy of mesh so to not change any face data
mesh_copy = base_mesh
# Body count should be equivalent to the number of tows - make sure not to merge vertices
body_count = mesh_copy.body_count
# Split mesh modies into individual tow meshes
mesh_bodies = mesh_copy.split(only_watertight=False)
if (len(bodies) is 0):
return Trimesh()
# Based on interesting bodies, create new mesh with only those bodies
intersecting = Trimesh()
for i in bodies:
if intersecting.is_empty:
intersecting = mesh_bodies[i - 1]
else:
intersecting = intersecting.__add__(mesh_bodies[i - 1])
return intersecting
