317 lines
8.4 KiB
Python
Executable File
317 lines
8.4 KiB
Python
Executable File
#!/usr/bin/env python3
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import sys
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"""
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obja model for python.
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"""
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class Vector:
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"""
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The class that holds the x, y, and z coordinates of a vector.
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"""
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def __init__(self, x, y, z):
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"""
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Initializes a vector from values.
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"""
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self.x = x
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self.y = y
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self.z = z
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def from_array(array):
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"""
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Creates a vector from an array of string representing floats.
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"""
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return Vector(0, 0, 0).set(array)
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def set(self, array):
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"""
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Sets a vector from an array of string representing floats.
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"""
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self.x = float(array[0])
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self.y = float(array[1])
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self.z = float(array[2])
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return self
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def translate(self, array):
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"""
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Translates a vector from an array of string representing floats.
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"""
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self.x += float(array[0])
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self.y += float(array[1])
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self.z += float(array[2])
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def __str__(self):
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return "({}, {}, {})".format(self.x, self.y, self.z)
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def __add__(self, other):
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return Vector(self.x + other.x, self.y + other.y, self.z + other.z)
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def __iadd__(self, other):
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self.x += other.x
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self.y += other.y
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self.z += other.z
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return self
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def __sub__(self, other):
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return Vector(self.x - other.x, self.y - other.y, self.z - other.z)
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def __isub__(self, other):
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self.x -= other.x
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self.y -= other.y
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self.z -= other.z
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return self
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def __mul__(self, other):
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return Vector(self.x * other, self.y * other, self.z * other)
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def __imul__(self, other):
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self.x *= other
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self.y *= other
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self.z *= other
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return self
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def __truediv__(self, other):
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return Vector(self.x / other, self.y / other, self.z / other)
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def __itruediv__(self, other):
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self.x /= other
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self.y /= other
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self.z /= other
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return self
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def __repr__(self):
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return str(self)
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class Face:
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"""
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The class that holds a, b, and c, the indices of the vertices of the face.
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"""
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def __init__(self, array):
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"""
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Initializes a face from an array of strings representing vector indices (starting at 1)
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"""
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self.set(array)
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self.visible = True
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def set(self, array):
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"""
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Sets a face from an array of strings representing vector indices (starting at 1)
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"""
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self.a = int(array[0].split('/')[0]) - 1
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self.b = int(array[1].split('/')[0]) - 1
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self.c = int(array[2].split('/')[0]) - 1
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return self
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def test(self, vertices, line = "unknown"):
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"""
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Tests if a face references only vertices that exist when the face is declared.
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"""
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if self.a >= len(vertices):
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raise VertexError(self.a + 1, line)
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if self.b >= len(vertices):
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raise VertexError(self.b + 1, line)
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if self.c >= len(vertices):
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raise VertexError(self.c + 1, line)
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def __str__(self):
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return "Face({}, {}, {})".format(self.a, self.b, self.c)
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def __repr__(self):
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return str(self)
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class VertexError(Exception):
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"""
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An operation references a vertex that does not exist.
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"""
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def __init__(self, index, line):
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"""
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Creates the error from index of the referenced vertex and the line where the error occured.
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"""
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self.line = line
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self.index = index
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super().__init__()
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def __str__(self):
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"""
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Pretty prints the error.
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"""
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return f'There is no vector {self.index} (line {self.line})'
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class FaceError(Exception):
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"""
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An operation references a face that does not exist.
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"""
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def __init__(self, index, line):
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"""
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Creates the error from index of the referenced face and the line where the error occured.
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"""
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self.line = line
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self.index = index
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super().__init__()
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def __str__(self):
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"""
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Pretty prints the error.
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"""
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return f'There is no face {self.index} (line {self.line})'
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class FaceVertexError(Exception):
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"""
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An operation references a face vector that does not exist.
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"""
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def __init__(self, index, line):
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"""
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Creates the error from index of the referenced face vector and the line where the error occured.
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"""
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self.line = line
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self.index = index
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super().__init__()
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def __str__(self):
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"""
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Pretty prints the error.
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"""
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return f'Face has no vector {self.index} (line {self.line})'
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class UnknownInstruction(Exception):
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"""
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An instruction is unknown.
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"""
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def __init__(self, instruction, line):
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"""
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Creates the error from instruction and the line where the error occured.
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"""
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self.line = line
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self.instruction = instruction
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super().__init__()
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def __str__(self):
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"""
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Pretty prints the error.
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"""
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return f'Instruction {self.instruction} unknown (line {self.line})'
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class Model:
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"""
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The OBJA model.
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"""
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def __init__(self):
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"""
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Intializes an empty model.
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"""
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self.vertices = []
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self.faces = []
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self.line = 0
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def get_vector_from_string(self, string):
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"""
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Gets a vector from a string representing the index of the vector, starting at 1.
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To get the vector from its index, simply use model.vertices[i].
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"""
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index = int(string) - 1
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if index >= len(self.vertices):
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raise FaceError(index + 1, self.line)
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return self.vertices[index]
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def get_face_from_string(self, string):
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"""
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Gets a face from a string representing the index of the face, starting at 1.
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To get the face from its index, simply use model.faces[i].
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"""
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index = int(string) - 1
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if index >= len(self.faces):
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raise FaceError(index + 1, self.line)
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return self.faces[index]
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def parse_file(self, path):
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"""
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Parses an OBJA file.
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"""
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with open(path, "r") as file:
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for line in file.readlines():
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self.parse_line(line)
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def parse_line(self, line):
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"""
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Parses a line of obja file.
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"""
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self.line += 1
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split = line.split()
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if len(split) == 0:
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return
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if split[0] == "v":
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self.vertices.append(Vector.from_array(split[1:]))
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elif split[0] == "ev":
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self.get_vector_from_string(split[1]).set(split[2:])
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elif split[0] == "tv":
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self.get_vector_from_string(split[1]).translate(split[2:])
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elif split[0] == "f" or split[0] == "tf":
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for i in range(1, len(split) - 2):
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face = Face(split[i:i+3])
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face.test(self.vertices, self.line)
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self.faces.append(face)
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elif split[0] == "ts":
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for i in range(1, len(split) - 2):
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if i % 2 == 1:
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face = Face([split[i], split[i + 1], split[i + 2]])
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else:
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face = Face([split[i], split[i + 2], split[i + 1]])
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face.test(self.vertices, self.line)
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self.faces.append(face)
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elif split[0] == "ef":
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self.get_face_from_string(split[1]).set(split[2:])
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elif split[0] == "efv":
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face = self.get_face_from_string(split[1])
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vector = int(split[2])
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new_index = int(split[3]) - 1
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if vector == 1:
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face.a = new_index
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elif vector == 2:
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face.b = new_index
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elif vector == 3:
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face.c = new_index
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else:
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raise FaceVertexError(vector, self.line)
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elif split[0] == "df":
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self.get_face_from_string(split[1]).visible = False
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elif split[0] == "#":
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return
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else:
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return
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# raise UnknownInstruction(split[0], self.line)
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def parse_file(path):
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"""
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Parses a file and returns the model.
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"""
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model = Model()
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model.parse_file(path)
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return model
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def main():
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if len(sys.argv) == 1:
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print("obja needs a path to an obja file")
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return
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model = parse_file(sys.argv[1])
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print(model.vertices)
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print(model.faces)
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if __name__ == "__main__":
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main()
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