Pyopengl reading obj file

问题

I tried to read obj file with pyopengl but error come from glGenList(1) I just want to read the file and display in opengl Pls can you help me with full code;

Am tired of stack and error it took me 3hrd to post this from OpenGL.GL import * from tkinter import messagebox import sys

filename = input('pls input file path: ')


class OBJ:
    def __init__(self, filename, swapyz=False):
    """Loads a Wavefront OBJ file. """
    self.vertices = []
    self.normals = []
    self.texcoords = []
    self.faces = []

    material = None
    for line in open(filename, "r"):
        if line.startswith('#'): continue
        values = line.split()
        #print(values)
        if not values: continue
        if values[0] == 'v':
            v = list(map(float, values[1:4]))
            if swapyz:
                v = (v[0], v[2], v[1])
            self.vertices.append(v)
        elif values[0] == 'vn':
            v = list(map(float, values[1:4]))
            if swapyz:
                v = (v[0], v[2], v[1])
            self.normals.append(v)
        elif values[0] == 'vt':
            self.texcoords.append(map(float, values[1:3]))
        elif values[0] == 'mtllib':
            continue
        elif values[0] == 'f':
            face = []
            texcoords = []
            norms = []
            for v in values[1:]:
                w = v.split('/')
                face.append(int(w[0]))
                if len(w) >= 2 and len(w[1]) > 0:
                    texcoords.append(int(w[1]))
                else:
                    texcoords.append(0)
                if len(w) >= 3 and len(w[2]) > 0:
                    norms.append(int(w[2]))
                else:
                    norms.append(0)
            self.faces.append((face, norms, texcoords))
            #print(self.faces)

    self.gl_list = glGenLists(0)
    glNewList(self.gl_list, GL_COMPILE)
    #glEnable(GL_TEXTURE_2D)
    #glFrontFace(GL_CCW)
    for face in self.faces:
        vertices, normals, texture_coords = face


        glBegin(GL_POLYGON)
        for i in range(len(vertices)):
            if normals[i] > 0:
                glNormal3fv(self.normals[normals[i] - 1])
            if texture_coords[i] > 0:
                glTexCoord2fv(self.texcoords[texture_coords[i] - 1])
             glVertex3fv(self.vertices[vertices[i] - 1])
        glEnd()
    glEndList() 
OBJ(filename,swapyz=True)

回答1:

For any OpenGL instruction a valid and current OpenGL Context is required. Make sure that you have created the OpenGL window before creating the display list.

---

There is a 2nd issue, that will cause an error when glNewList is called, after the 1st issue has been solved. You want to create more than 1 display lists objects, hence the argument to glGenLists has to be at least 1:

self.gl_list = glGenLists(0)

self.gl_list = glGenLists(1)

来源：https://stackoverflow.com/questions/62625561/pyopengl-reading-obj-file