pyopengl 读取obj文件

以下是使用pyopengl读取obj文件的示例代码：

from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
import numpy as np

def load_obj(filename):
    vertices = []
    faces = []
    with open(filename) as f:
        for line in f:
            if line.startswith('#'):
                continue
            values = line.split()
            if not values:
                continue
            if values[0] == 'v':
                vertices.append(list(map(float, values[1:4])))
            elif values[0] == 'f':
                face = []
                for v in values[1:]:
                    w = v.split('/')
                    face.append(int(w[0]))
                faces.append(face)
    return vertices, faces

def draw_obj(vertices, faces):
    glBegin(GL_TRIANGLES)
    for face in faces:
        for vertex in face:
            glVertex3fv(vertices[vertex-1])
    glEnd()

def display():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    glLoadIdentity()
    gluLookAt(0, 0, 5, 0, 0, 0, 0, 1, 0)
    glColor3f(1, 1, 1)
    draw_obj(vertices, faces)
    glutSwapBuffers()

def reshape(width, height):
    glViewport(0, 0, width, height)
    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluPerspective(45, width/height, 0.1, 50.0)
    glMatrixMode(GL_MODELVIEW)

glutInit()
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
glutInitWindowSize(640, 480)
glutCreateWindow("OBJ Viewer")
glutDisplayFunc(display)
glutReshapeFunc(reshape)
glEnable(GL_DEPTH_TEST)
vertices, faces = load_obj("example.obj")
glutMainLoop()

这段代码使用了OpenGL的一些基本函数，首先通过`load_obj`函数读取obj文件中的顶点和面信息，然后通过`draw_obj`函数绘制出来。在`display`函数中，我们使用了OpenGL的一些函数来设置视角和颜色，并调用`draw_obj`函数来绘制模型。最后通过`glutMainLoop`函数进入主循环，等待用户交互。