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scene_reader.py
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scene_reader.py
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from os.path import dirname, join
from vector import V, cross_prod, dist, triangle_area, normalize
def calc_normal(tri):
normal = normalize(cross_prod(tri[1] - tri[0],
tri[2] - tri[0]))
return normal
def next_tokens(lines):
if lines != []:
line = lines[0]
# print(line.replace('\n', ''))
del lines[0]
tokens = [t for t in line.split(' ') if not t in ['', ' ']]
return tokens
else:
return []
def look_ahead(lines):
line = lines[0]
tokens = [t for t in line.split(' ') if not t in ['', ' ']]
# print('tokens: ', tokens)
return tokens
def remove_spaces_from_start(line):
i = 0
while line[i] == ' ':
i += 1
return line[i:]
def remove_all_comments(lines):
new_lines = []
for line in lines:
line = remove_spaces_from_start(line)
if line[0] != '#':
if '#' in line:
new_lines.append(line.split('#')[0])
else:
new_lines.append(line)
new_lines[-1] = new_lines[-1].replace('\n', '').replace('\t', ' ')
return new_lines
class Obj():
def __init__(self, path):
print('Reading ' + path)
self.triangles = []
self.areas = []
self.normals = []
self.vertexes = []
self.faces = []
self.vtx_idx = 0
self.read_obj(path)
def parse_vertex(self, tokens):
self.vertexes.append(V([float(x) for x in tokens]))
self.vtx_idx += 1
def parse_face(self, tokens):
face = []
for i in tokens:
i = int(i)
if i < 0:
face.append(self.vtx_idx + i)
else:
face.append(i - 1)
faces = []
if len(face) > 3:
v1 = face[0]
for i in range(1, len(face) - 1):
faces.append((v1, face[i], face[i + 1]))
else:
faces.append(face)
self.faces.extend(faces)
for face in faces:
triangle = (self.vertexes[face[0]],
self.vertexes[face[1]],
self.vertexes[face[2]])
self.triangles.append(triangle)
self.normals.append(calc_normal(triangle))
self.areas.append(triangle_area(triangle))
# print('f ', self.faces[-1])
def read_obj(self, path):
with open(path, 'r') as f:
self.lines = f.readlines()
self.lines = remove_all_comments(self.lines)
while self.lines != []:
tokens = next_tokens(self.lines)
if tokens != []:
if tokens[0] == 'v':
self.parse_vertex(tokens[1:])
elif tokens[0] == 'f':
self.parse_face(tokens[1:])
else:
print(f'{path}\n\tSkipping command \'{tokens[0]}\' ! '
f'\n\tParameters: {tokens[1:]}')
class Scene():
def __init__(self, path):
self.eye = None
self.width = None
self.height = None
self.ortho = None
self.background = None
self.ambient = None
self.light_obj = None
self.light_color = None
self.npaths = None
self.tonemapping = None
self.seed = None
self.objects = []
self.read_scene(path)
def __repr__(self):
return (f'<Scene'
f'\n\t eye = {self.eye}'
f'\n\t width = {self.width}'
f'\n\t height = {self.height}'
f'\n\t ortho = {self.ortho}'
f'\n\t background = {self.background}'
f'\n\t ambient = {self.ambient}'
f'\n\t light_obj = {self.light_obj}'
f'\n\t light_color = {self.light_color}'
f'\n\t npaths = {self.npaths}'
f'\n\t tonemapping = {self.tonemapping}'
f'\n\t seed = {self.seed}'
f'\n\t objects = {self.objects}'
'\n>')
def read_scene(self, path):
try:
with open(path, 'r') as f:
self.lines = f.readlines()
self.lines = remove_all_comments(self.lines)
except OSError as e:
print('Could not open file!')
raise e
while self.lines != []:
tokens = next_tokens(self.lines)
if tokens != []:
if tokens[0] == 'eye':
self.eye = [float(tkn) for tkn in tokens[1:4]]
elif tokens[0] == 'size':
self.width = int(tokens[1])
self.height = int(tokens[2])
elif tokens[0] == 'ortho':
self.ortho = [float(tkn) for tkn in tokens[1:5]]
elif tokens[0] == 'background':
self.background = [float(tkn) for tkn in tokens[1:4]]
elif tokens[0] == 'ambient':
self.ambient = float(tokens[1])
elif tokens[0] == 'light':
self.light_obj = Obj(join(dirname(path), tokens[1]))
self.light_color = [float(tkn) for tkn in tokens[2:6]]
elif tokens[0] == 'npaths':
self.npaths = int(tokens[1])
elif tokens[0] == 'tonemapping':
self.tonemapping = float(tokens[1])
elif tokens[0] == 'seed':
self.seed = int(tokens[1])
elif tokens[0] == 'object':
object_dict = {}
object_dict['geometry'] = Obj(
join(dirname(path), tokens[1]))
object_dict['red'] = float(tokens[2])
object_dict['green'] = float(tokens[3])
object_dict['blue'] = float(tokens[4])
object_dict['ka'] = float(tokens[5])
object_dict['kd'] = float(tokens[6])
object_dict['ks'] = float(tokens[7])
object_dict['kt'] = float(tokens[8])
object_dict['n'] = float(tokens[9])
self.objects.append(object_dict)
elif tokens[0] == 'output':
self.output = join(dirname(path), tokens[1])
else:
print(f'Scene {path}\n\tSkipping command \'{tokens[0]}\'!'
f' Parameters: {tokens[1:]}')