利用Python从PLY文件中提取颜色信息、索引信息、法线信息、模型的顶点坐标

class MeshPly:   
    def __init__(self,filename,color=[0.,0.,0.]):

	f = open(filename,'r')
	self.vertices=[]
	self.colors=[]
	self.indices=[]
	self.normals = []
	vertex_mode = False
	face_mode = False
	nb_vertices = 0
	nb_faces = 0
	idx = 0
	with f as open_file_object:
		for line in open_file_object:
			elements = line.split()
			if vertex_mode:
				self.vertices.append([float(i) for i in elements[:3]])
				self.normals.append([float(i) for i in elements[3:6]])
				if elements[6:9]:
					self.colors.append([float(i) / 255. for i in elements[6:9]])
				else:
					self.colors.append([float(i) / 255. for i in color])
				idx += 1
				if idx == nb_vertices:
					vertex_mode = False
					face_mode = True
					idx= 0 
			elif face_mode:
				self.indices.append([float(i) for i in elements[1:4]])
				idx += 1
				if idx == nb_faces:
					face_mode == False
			elif elements[0] == 'element':
				if elements[1] == 'vertex':
					nb_vertices = int(elements[2])
				elif elements[1] == 'face':
					nb_faces =int(elements[2])
			elif elements[0] == 'end_header':
				vertex_mode = True
if __name__ == '__main__':  
    path_mode = '**/**/**'  
    mesh = MeshPly(path_mode)