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mesh.py
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from tempfile import mkstemp
from shutil import move
import torch
import numpy as np
import os
from models.layers.mesh_union import MeshUnion
from models.layers.mesh_prepare import fill_mesh
class Mesh:
def __init__(self, file=None, opt=None, hold_history=False, export_folder=''):
self.vs = self.v_mask = self.filename = self.features = self.edge_areas = None
self.edges = self.gemm_edges = self.sides = None
self.pool_count = 0
fill_mesh(self, file, opt)
self.export_folder = export_folder
self.history_data = None
if hold_history:
self.init_history()
self.export()
def extract_features(self):
return self.features
def merge_vertices(self, edge_id):
self.remove_edge(edge_id)
edge = self.edges[edge_id]
v_a = self.vs[edge[0]]
v_b = self.vs[edge[1]]
# update pA
v_a.__iadd__(v_b)
v_a.__itruediv__(2)
self.v_mask[edge[1]] = False
mask = self.edges == edge[1]
self.ve[edge[0]].extend(self.ve[edge[1]])
self.edges[mask] = edge[0]
def remove_vertex(self, v):
self.v_mask[v] = False
def remove_edge(self, edge_id):
vs = self.edges[edge_id]
for v in vs:
if edge_id not in self.ve[v]:
print(self.ve[v])
print(self.filename)
self.ve[v].remove(edge_id)
def clean(self, edges_mask, groups):
edges_mask = edges_mask.astype(bool)
torch_mask = torch.from_numpy(edges_mask.copy())
self.gemm_edges = self.gemm_edges[edges_mask]
self.edges = self.edges[edges_mask]
self.sides = self.sides[edges_mask]
new_ve = []
edges_mask = np.concatenate([edges_mask, [False]])
new_indices = np.zeros(edges_mask.shape[0], dtype=np.int32)
new_indices[-1] = -1
new_indices[edges_mask] = np.arange(0, np.ma.where(edges_mask)[0].shape[0])
self.gemm_edges[:, :] = new_indices[self.gemm_edges[:, :]]
for v_index, ve in enumerate(self.ve):
update_ve = []
# if self.v_mask[v_index]:
for e in ve:
update_ve.append(new_indices[e])
new_ve.append(update_ve)
self.ve = new_ve
self.__clean_history(groups, torch_mask)
self.pool_count += 1
self.export()
def export(self, file=None, vcolor=None):
if file is None:
if self.export_folder:
filename, file_extension = os.path.splitext(self.filename)
file = '%s/%s_%d%s' % (self.export_folder, filename, self.pool_count, file_extension)
else:
return
faces = []
vs = self.vs[self.v_mask]
gemm = np.array(self.gemm_edges)
new_indices = np.zeros(self.v_mask.shape[0], dtype=np.int32)
new_indices[self.v_mask] = np.arange(0, np.ma.where(self.v_mask)[0].shape[0])
for edge_index in range(len(gemm)):
cycles = self.__get_cycle(gemm, edge_index)
for cycle in cycles:
faces.append(self.__cycle_to_face(cycle, new_indices))
with open(file, 'w+') as f:
for vi, v in enumerate(vs):
vcol = ' %f %f %f' % (vcolor[vi, 0], vcolor[vi, 1], vcolor[vi, 2]) if vcolor is not None else ''
f.write("v %f %f %f%s\n" % (v[0], v[1], v[2], vcol))
for face_id in range(len(faces) - 1):
f.write("f %d %d %d\n" % (faces[face_id][0] + 1, faces[face_id][1] + 1, faces[face_id][2] + 1))
f.write("f %d %d %d" % (faces[-1][0] + 1, faces[-1][1] + 1, faces[-1][2] + 1))
for edge in self.edges:
f.write("\ne %d %d" % (new_indices[edge[0]] + 1, new_indices[edge[1]] + 1))
def export_segments(self, segments):
if not self.export_folder:
return
cur_segments = segments
for i in range(self.pool_count + 1):
filename, file_extension = os.path.splitext(self.filename)
file = '%s/%s_%d%s' % (self.export_folder, filename, i, file_extension)
fh, abs_path = mkstemp()
edge_key = 0
with os.fdopen(fh, 'w') as new_file:
with open(file) as old_file:
for line in old_file:
if line[0] == 'e':
new_file.write('%s %d' % (line.strip(), cur_segments[edge_key]))
if edge_key < len(cur_segments):
edge_key += 1
new_file.write('\n')
else:
new_file.write(line)
os.remove(file)
move(abs_path, file)
if i < len(self.history_data['edges_mask']):
cur_segments = segments[:len(self.history_data['edges_mask'][i])]
cur_segments = cur_segments[self.history_data['edges_mask'][i]]
def __get_cycle(self, gemm, edge_id):
cycles = []
for j in range(2):
next_side = start_point = j * 2
next_key = edge_id
if gemm[edge_id, start_point] == -1:
continue
cycles.append([])
for i in range(3):
tmp_next_key = gemm[next_key, next_side]
tmp_next_side = self.sides[next_key, next_side]
tmp_next_side = tmp_next_side + 1 - 2 * (tmp_next_side % 2)
gemm[next_key, next_side] = -1
gemm[next_key, next_side + 1 - 2 * (next_side % 2)] = -1
next_key = tmp_next_key
next_side = tmp_next_side
cycles[-1].append(next_key)
return cycles
def __cycle_to_face(self, cycle, v_indices):
face = []
for i in range(3):
v = list(set(self.edges[cycle[i]]) & set(self.edges[cycle[(i + 1) % 3]]))[0]
face.append(v_indices[v])
return face
def init_history(self):
self.history_data = {
'groups': [],
'gemm_edges': [self.gemm_edges.copy()],
'occurrences': [],
'old2current': np.arange(self.edges_count, dtype=np.int32),
'current2old': np.arange(self.edges_count, dtype=np.int32),
'edges_mask': [torch.ones(self.edges_count,dtype=torch.bool)],
'edges_count': [self.edges_count],
}
if self.export_folder:
self.history_data['collapses'] = MeshUnion(self.edges_count)
def union_groups(self, source, target):
if self.export_folder and self.history_data:
self.history_data['collapses'].union(self.history_data['current2old'][source], self.history_data['current2old'][target])
return
def remove_group(self, index):
if self.history_data is not None:
self.history_data['edges_mask'][-1][self.history_data['current2old'][index]] = 0
self.history_data['old2current'][self.history_data['current2old'][index]] = -1
if self.export_folder:
self.history_data['collapses'].remove_group(self.history_data['current2old'][index])
def get_groups(self):
return self.history_data['groups'].pop()
def get_occurrences(self):
return self.history_data['occurrences'].pop()
def __clean_history(self, groups, pool_mask):
if self.history_data is not None:
mask = self.history_data['old2current'] != -1
self.history_data['old2current'][mask] = np.arange(self.edges_count, dtype=np.int32)
self.history_data['current2old'][0: self.edges_count] = np.ma.where(mask)[0]
if self.export_folder != '':
self.history_data['edges_mask'].append(self.history_data['edges_mask'][-1].clone())
self.history_data['occurrences'].append(groups.get_occurrences())
self.history_data['groups'].append(groups.get_groups(pool_mask))
self.history_data['gemm_edges'].append(self.gemm_edges.copy())
self.history_data['edges_count'].append(self.edges_count)
def unroll_gemm(self):
self.history_data['gemm_edges'].pop()
self.gemm_edges = self.history_data['gemm_edges'][-1]
self.history_data['edges_count'].pop()
self.edges_count = self.history_data['edges_count'][-1]
def get_edge_areas(self):
return self.edge_areas