How to import 3d texture in pyOpenGL from obj file

Question

Im trying to add 3d texture to my PyopenGL project with pygame. i've used the following code and get an error at the glTexImage3D

def MTL(filename):
    contents = {}
    mtl = None
    for line in open(filename, "r"):
        if line.startswith('#'):
            continue
        values = line.split()
        if not values:
            continue
        if values[0] == 'newmtl':
            mtl = contents[values[1]] = {}
        elif mtl is None:
            raise ValueError, "mtl file doesn't start with newmtl stmt"
        elif values[0] == 'map_Kd':
            # load the texture referred to by this declaration
            mtl[values[0]] = values[1]
            surf = pygame.image.load(mtl['map_Kd'])
            image = pygame.image.tostring(surf, 'RGBA', 1)
            ix, iy = surf.get_rect().size
            texid = mtl['texture_Kd'] = glGenTextures(1)
            glBindTexture(GL_TEXTURE_3D, texid)
            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT)
            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT)
            glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT)
            glTexImage3D(GL_TEXTURE_3D, 0, GL_RGBA, ix, 0, iy, 0, GL_RGBA, GL_UNSIGNED_BYTE, image)
        else:
            mtl[values[0]] = map(float, values[1:])
    return contents



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()
            if not values: continue
            if values[0] == 'v':
                v = map(float, values[1:4])
                if swapyz:
                    v = v[0], v[2], v[1]
                self.vertices.append(v)
            elif values[0] == 'vn':
                v = 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] in ('usemtl', 'usemat'):
                material = values[1]
            elif values[0] == 'mtllib':
                self.mtl = MTL(values[1])
            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, material))

        self.gl_list = glGenLists(1)
        glNewList(self.gl_list, GL_COMPILE)
        glEnable(GL_TEXTURE_3D)
        glFrontFace(GL_CCW)
        for face in self.faces:
            vertices, normals, texture_coords, material = face

            mtl = self.mtl[material]
            if 'texture_Kd' in mtl:
                # use diffuse texmap
                glBindTexture(GL_TEXTURE_3D, mtl['texture_Kd'])
            else:
                # just use diffuse colour
                glColor(*mtl['Kd'])

            glBegin(GL_POLYGON)
            for i in range(len(vertices)):
                if normals[i] > 0:
                    glNormal3fv(self.normals[normals[i] - 1])
                if texture_coords[i] > 0:
                    glTexCoord3fv(self.texcoords[texture_coords[i] - 1])
                glVertex3fv(self.vertices[vertices[i] - 1])
            glEnd()
        glDisable(GL_TEXTURE_3D)
        glEndList()

in main i just load

   obj = OBJ("ground_NFL.obj", swapyz=True)

and while true:

   glCallList(obj.gl_list)

the error is:

OpenGL.error.GLError: GLError(
err = 1281,
description = 'invalid value',
baseOperation = glTexImage3D,
pyArgs = (
    GL_TEXTURE_3D,
    0,
    GL_RGBA,
    4096,
    4096,
    0,
    0,
    GL_RGBA,
    GL_UNSIGNED_BYTE,
    'NrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\xffNrN\...,
),

i think there is something wrong with the flow. thanks for the help the project uses pygame and pyopengl i've taken the code originally from pygame in the following link https://www.pygame.org/wiki/OBJFileLoader but it only converts 2d images.

Answer 1

是的，我尝试上传2D纹理，用2d替换3d修复了问题