python读取ply文件

以下是几种不同的实现方法：

方法一：使用第三方库plyfile

from plyfile import PlyData
 
with open('file.ply', 'rb') as f:
    plydata = PlyData.read(f)
 
# 访问属性数据
vertices = plydata['vertex']
x_values = vertices['x']
y_values = vertices['y']
z_values = vertices['z']
 
# 访问元素数据
faces = plydata['face']
face_indices = faces['vertex_indices']

方法二：使用第三方库numpy和struct

import numpy as np
import struct
 
def read_ply_file(file_path):
    with open(file_path, 'rb') as f:
        header = ''
        while True:
            line = f.readline().decode('utf-8').strip()
            header += line + '\n'
            if line.startswith('end_header'):
                break
 
        vertex_count = int(header.split('element vertex ')[1])
 
        # 读取顶点数据
        vertices = []
        for _ in range(vertex_count):
            line = f.readline().decode('utf-8').strip()
            values = [float(v) for v in line.split()]
            vertices.append(values)
 
        # 读取面数据
        face_count = int(header.split('element face ')[1])
        faces = []
        for _ in range(face_count):
            line = f.readline().decode('utf-8').strip()
            values = [int(v) for v in line.split()][1:]
            faces.append(values)
 
    return np.array(vertices), np.array(faces)
 
vertices, faces = read_ply_file('file.ply')

方法三：使用自定义的PLY文件解析器

class PlyParser:
    def __init__(self):
        self.vertices = []
        self.faces = []
 
    def parse_vertex(self, line):
        values = [float(v) for v in line.split()]
        self.vertices.append(values)
 
    def parse_face(self, line):
        values = [int(v) for v in line.split()][1:]
        self.faces.append(values)
 
    def parse_file(self, file_path):
        with open(file_path, 'r') as f:
            header = ''
            while True:
                line = f.readline().strip()
                header += line + '\n'
                if line.startswith('end_header'):
                    break
 
            for line in f:
                if line.startswith('element vertex'):
                    vertex_count = int(line.split()[2])
                elif line.startswith('element face'):
                    face_count = int(line.split()[2])
                elif line.startswith('property'):
                    continue
                elif line.strip() == 'end_header':
                    break
 
            for _ in range(vertex_count):
                line = f.readline().strip()
                self.parse_vertex(line)
 
            for _ in range(face_count):
                line = f.readline().strip()
                self.parse_face(line)
 
parser = PlyParser()
parser.parse_file('file.ply')
vertices = np.array(parser.vertices)
faces = np.array(parser.faces)

这些是读取PLY文件的几种不同实现方法，每种方法可以根据实际需求选择最适合的方法。