495 lines
17 KiB
Python
495 lines
17 KiB
Python
import os
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import sys
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import struct
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from ..basemodel import ModelParser, TextModelParser, Exporter, Vertex, Face, Color, FaceVertex, TexCoord, Material
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class UnkownTypeError(Exception):
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def __init__(self, message):
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self.message = message
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def is_ply(filename):
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"""Checks that the file is a .ply file
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Only checks the extension of the file
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:param filename: path to the file
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"""
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return filename[-4:] == '.ply'
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# List won't work with this function
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def _ply_type_size(type):
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"""Returns the size of a ply property
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:param type: a string that is in a ply element
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"""
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if type == 'char' or type == 'uchar':
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return 1
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elif type == 'short' or type == 'ushort':
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return 2
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elif type == 'int' or type == 'uint':
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return 4
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elif type == 'float':
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return 4
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elif type == 'double':
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return 8
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else:
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raise UnkownTypeError('Type ' + type + ' is unknown')
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def ply_type_size(type):
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"""Returns the list containing the sizes of the elements
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:param type: a string that is in a ply element
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"""
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split = type.split()
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if len(split) == 1:
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return [_ply_type_size(type)]
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else:
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if split[0] != 'list':
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print('You have multiple types but it\'s not a list...', file=sys.stderr)
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sys.exit(-1)
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else:
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return list(map(lambda a: _ply_type_size(a), split[1:]))
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def bytes_to_element(type, bytes, byteorder = 'little'):
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"""Returns a python object parsed from bytes
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:param type: the type of the object to parse
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:param bytes: the bytes to read
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:param byteorder: little or big endian
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"""
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if type == 'char':
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return ord(struct.unpack('<b', bytes)[0])
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if type == 'uchar':
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return ord(struct.unpack('<c', bytes)[0])
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elif type == 'short':
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return struct.unpack('<h', bytes)[0]
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elif type == 'ushort':
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return struct.unpack('<H', bytes)[0]
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elif type == 'int':
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return struct.unpack('<i', bytes)[0]
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elif type == 'uint':
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return struct.unpack('<I', bytes)[0]
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elif type == 'float':
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return struct.unpack('<f', bytes)[0]
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elif type == 'double':
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return struct.unpack('<d', bytes)[0]
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else:
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raise UnkownTypeError('Type ' + type + ' is unknown')
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class PLYParser(ModelParser):
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"""Parser that parses a .ply file
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"""
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def __init__(self, up_conversion = None):
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super().__init__(up_conversion)
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self.counter = 0
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self.elements = []
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self.inner_parser = PLYHeaderParser(self)
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self.beginning_of_line = ''
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self.header_finished = False
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def parse_bytes(self, bytes, byte_counter):
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"""Parses bytes of a .ply file
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"""
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if self.header_finished:
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self.inner_parser.parse_bytes(self.beginning_of_line + bytes, byte_counter - len(self.beginning_of_line))
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self.beginning_of_line = b''
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return
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# Build lines for header and use PLYHeaderParser
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current_line = self.beginning_of_line
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for (i, c) in enumerate(bytes):
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char = chr(c)
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if char == '\n':
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self.inner_parser.parse_line(current_line)
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if current_line == 'end_header':
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self.header_finished = True
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self.beginning_of_line = bytes[i+1:]
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return
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current_line = ''
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else:
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current_line += chr(c)
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self.beginning_of_line = current_line
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class PLYHeaderParser:
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"""Parser that parses the header of a .ply file
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"""
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def __init__(self, parent):
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self.current_element = None
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self.parent = parent
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self.content_parser = None
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def parse_line(self, string):
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split = string.split()
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if string == 'ply':
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return
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elif split[0] == 'format':
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if split[2] != '1.0':
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print('Only format 1.0 is supported', file=sys.stderr)
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sys.exit(-1)
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if split[1] == 'ascii':
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self.content_parser = PLY_ASCII_ContentParser(self.parent)
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elif split[1] == 'binary_little_endian':
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self.content_parser = PLYLittleEndianContentParser(self.parent)
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elif split[1] == 'binary_big_endian':
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self.content_parser = PLYBigEndianContentParser(self.parent)
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else:
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print('Only ascii, binary_little_endian and binary_big_endian are supported', \
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file=sys.stderr)
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sys.exit(-1)
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elif split[0] == 'element':
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self.current_element = PLYElement(split[1], int(split[2]))
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self.parent.elements.append(self.current_element)
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elif split[0] == 'property':
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self.current_element.add_property(split[-1], ' '.join(split[1:-1]))
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elif split[0] == 'end_header':
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self.parent.inner_parser = self.content_parser
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elif split[0] == 'comment' and split[1] == 'TextureFile':
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material = Material('mat' + str(len(self.parent.materials)))
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self.parent.materials.append(material)
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material.relative_path_to_texture = split[2]
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material.absolute_path_to_texture = os.path.join(os.path.dirname(self.parent.path), split[2])
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class PLYElement:
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def __init__(self, name, number):
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self.name = name
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self.number = number
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self.properties = []
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def add_property(self, name, type):
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self.properties.append((name, type))
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class PLY_ASCII_ContentParser:
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def __init__(self, parent):
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self.parent = parent
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self.element_index = 0
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self.counter = 0
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self.current_element = None
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self.beginning_of_line = ''
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def parse_bytes(self, bytes, byte_counter):
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current_line = self.beginning_of_line
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for (i, c) in enumerate(bytes):
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char = chr(c)
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if char == '\n':
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self.parse_line(current_line)
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current_line = ''
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else:
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current_line += chr(c)
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self.beginning_of_line = current_line
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def parse_line(self, string):
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if string == '':
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return
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if self.current_element is None:
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self.current_element = self.parent.elements[0]
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split = string.split()
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color = None
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if self.current_element.name == 'vertex':
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vertex = Vertex()
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red = None
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blue = None
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green = None
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alpha = None
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offset = 0
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for property in self.current_element.properties:
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if property[0] == 'x':
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vertex.x = float(split[offset])
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elif property[0] == 'y':
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vertex.y = float(split[offset])
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elif property[0] == 'z':
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vertex.z = float(split[offset])
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elif property[0] == 'red':
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red = float(split[offset]) / 255
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elif property[0] == 'green':
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green = float(split[offset]) / 255
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elif property[0] == 'blue':
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blue = float(split[offset]) / 255
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elif property[0] == 'alpha':
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alpha = float(split[offset]) / 255
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offset += 1
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self.parent.add_vertex(vertex)
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if red is not None:
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color = Color(red, blue, green)
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self.parent.add_color(color)
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elif self.current_element.name == 'face':
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faceVertexArray = []
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current_material = None
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# Analyse element
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offset = 0
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for property in self.current_element.properties:
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if property[0] == 'vertex_indices':
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for i in range(int(split[offset])):
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faceVertexArray.append(FaceVertex(int(split[i+offset+1])))
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offset += int(split[0]) + 1
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elif property[0] == 'texcoord':
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offset += 1
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for i in range(3):
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# Create corresponding tex_coords
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tex_coord = TexCoord().from_array(split[offset:offset+2])
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offset += 2
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self.parent.add_tex_coord(tex_coord)
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faceVertexArray[i].tex_coord = len(self.parent.tex_coords) - 1
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elif property[0] == 'texnumber':
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current_material = self.parent.materials[int(split[offset])]
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offset += 1
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face = Face(*faceVertexArray)
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face.material = current_material
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self.parent.add_face(face)
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self.counter += 1
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if self.counter == self.current_element.number:
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self.next_element()
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def next_element(self):
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self.element_index += 1
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if self.element_index < len(self.parent.elements):
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self.current_element = self.parent.elements[self.element_index]
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class PLYLittleEndianContentParser:
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def __init__(self, parent):
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self.parent = parent
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self.previous_bytes = b''
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self.element_index = 0
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self.counter = 0
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self.current_element = None
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self.started = False
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# Serves for debugging purposes
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# self.current_byte = 0
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def parse_bytes(self, bytes, byte_counter):
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if not self.started:
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# self.current_byte = byte_counter
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self.started = True
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if self.current_element is None:
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self.current_element = self.parent.elements[0]
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bytes = self.previous_bytes + bytes
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current_byte_index = 0
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while True:
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property_values = []
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beginning_byte_index = current_byte_index
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for property in self.current_element.properties:
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size = ply_type_size(property[1])
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if current_byte_index + size[0] > len(bytes):
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self.previous_bytes = bytes[beginning_byte_index:]
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# self.current_byte -= len(self.previous_bytes)
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return
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if len(size) == 1:
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size = size[0]
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current_property_bytes = bytes[current_byte_index:current_byte_index+size]
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property_values.append(bytes_to_element(property[1], current_property_bytes))
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current_byte_index += size
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# self.current_byte += size
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elif len(size) == 2:
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types = property[1].split()[1:]
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current_property_bytes = bytes[current_byte_index:current_byte_index+size[0]]
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number_of_elements = bytes_to_element(types[0], current_property_bytes)
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current_byte_index += size[0]
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# self.current_byte += size[0]
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property_values.append([])
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# Parse list
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for i in range(number_of_elements):
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if current_byte_index + size[1] > len(bytes):
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self.previous_bytes = bytes[beginning_byte_index:]
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# self.current_byte -= len(self.previous_bytes)
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return
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current_property_bytes = bytes[current_byte_index:current_byte_index+size[1]]
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property_values[-1].append(bytes_to_element(types[1], current_property_bytes))
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current_byte_index += size[1]
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# self.current_byte += size[1]
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else:
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print('I have not idea what this means', file=sys.stderr)
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# Add element
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if self.current_element.name == 'vertex':
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vertex = Vertex()
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red = None
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green = None
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blue = None
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alpha = None
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offset = 0
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for property in self.current_element.properties:
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if property[0] == 'x':
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vertex.x = property_values[offset]
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elif property[0] == 'y':
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vertex.y = property_values[offset]
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elif property[0] == 'z':
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vertex.z = property_values[offset]
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elif property[0] == 'red':
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red = property_values[offset] / 255
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elif property[0] == 'green':
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green = property_values[offset] / 255
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elif property[0] == 'blue':
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blue = property_values[offset] / 255
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elif property[0] == 'alpha':
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alpha = property_values[offset] / 255
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offset += 1
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self.parent.add_vertex(vertex)
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if red is not None:
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self.parent.add_color(Color(red, blue, green))
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elif self.current_element.name == 'face':
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vertex_indices = []
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tex_coords = []
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material = None
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for (i, property) in enumerate(self.current_element.properties):
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if property[0] == 'vertex_indices':
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vertex_indices.append(property_values[i][0])
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vertex_indices.append(property_values[i][1])
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vertex_indices.append(property_values[i][2])
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elif property[0] == 'texcoord':
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# Create texture coords
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for j in range(0,6,2):
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tex_coord = TexCoord(*property_values[i][j:j+2])
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tex_coords.append(tex_coord)
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elif property[0] == 'texnumber':
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material = self.parent.materials[property_values[i]]
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for tex_coord in tex_coords:
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self.parent.add_tex_coord(tex_coord)
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face = Face(*list(map(lambda x: FaceVertex(x), vertex_indices)))
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counter = 3
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if len(tex_coords) > 0:
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for face_vertex in [face.a, face.b, face.c]:
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face_vertex.tex_coord = len(self.parent.tex_coords) - counter
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counter -= 1
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if material is None and len(self.parent.materials) == 1:
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material = self.parent.materials[0]
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face.material = material
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self.parent.add_face(face)
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self.counter += 1
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if self.counter == self.current_element.number:
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self.next_element()
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def next_element(self):
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self.counter = 0
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self.element_index += 1
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if self.element_index < len(self.parent.elements):
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self.current_element = self.parent.elements[self.element_index]
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class PLYBigEndianContentParser(PLYLittleEndianContentParser):
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def __init__(self, parent):
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super().__init__(self, parent)
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def parse_bytes(self, bytes):
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# Reverse bytes, and then
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super().parse_bytes(self, bytes)
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class PLYExporter(Exporter):
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def __init__(self, model):
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super().__init__(model)
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def __str__(self):
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faces = sum([part.faces for part in self.model.parts], [])
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# Header
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string = "ply\nformat ascii 1.0\ncomment Automatically gnerated by model-converter\n"
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for material in self.model.materials:
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string += "comment TextureFile " + (material.relative_path_to_texture or 'None') + "\n"
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# Types : vertices
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string += "element vertex " + str(len(self.model.vertices)) +"\n"
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string += "property float x\nproperty float y\nproperty float z\n"
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# Types : faces
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string += "element face " + str(len(faces)) + "\n"
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string += "property list uchar int vertex_indices\n"
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if len(self.model.tex_coords) > 0:
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string += "property list uchar float texcoord\n"
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string += "property int texnumber\n"
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# End header
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string += "end_header\n"
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# Content of the model
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for vertex in self.model.vertices:
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string += str(vertex.x) + " " + str(vertex.y) + " " + str(vertex.z) + "\n"
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for face in faces:
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string += "3 " + str(face.a.vertex) + " " + str(face.b.vertex) + " " + str(face.c.vertex)
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if len(self.model.tex_coords) > 0:
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string += " 6 " \
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+ str(self.model.tex_coords[face.a.tex_coord].x) + " " \
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+ str(self.model.tex_coords[face.a.tex_coord].y) + " " \
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+ str(self.model.tex_coords[face.b.tex_coord].x) + " " \
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+ str(self.model.tex_coords[face.b.tex_coord].y) + " " \
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+ str(self.model.tex_coords[face.c.tex_coord].x) + " " \
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+ str(self.model.tex_coords[face.c.tex_coord].y) + " " \
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+ str(self.model.get_material_index(face.material))
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string += "\n"
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return string
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