Cython-CSG for python //示例不工作

Question

当我需要用3D模型(主要是CGS)做布尔运算时，我有一个项目，我试图实现python库上给出的示例，但它不起作用。似乎代码在OpenGL上运行，错误来自它而不是示例。

有人知道怎么让它工作吗?我错过了什么?

这是我得到的错误，库链接在下面。

OpenGL.error。NullFunctionError:试图调用未定义的函数在调用

之前，检查是否有bool(glutInit)

图书馆链接:https://github.com/timknip/pycsg

示例代码

import sys
import os
from OpenGL.GL import *
from OpenGL.GLUT import *
from OpenGL.GLU import *
sys.path.insert(0, os.getcwd())
from csg.core import CSG
from csg.geom import Vertex, Vector
from optparse import OptionParser
light_ambient = [0.3, 0.3, 0.3, 1.0]
light_diffuse = [0.7, 0.7, 0.7, 1.0]  # Red diffuse light
light_position = [100.0, 100.0, 100.0, 0.0]  # Infinite light location.
rot = 0.0
class TestRenderable(object):
def __init__(self, operation):
self.faces = []
self.normals = []
self.vertices = []
self.colors = []
self.vnormals = []
self.list = -1
a = CSG.cube()
b = CSG.cylinder(radius=0.5, start=[0., -2., 0.], end=[0., 2., 0.])
for p in a.polygons:
p.shared = [1.0, 0.0, 0.0, 1.0]
for p in b.polygons:
p.shared = [0.0, 1.0, 0.0, 1.0]
recursionlimit = sys.getrecursionlimit()
sys.setrecursionlimit(10000)
try:
if operation == 'subtract':
polygons = a.subtract(b).toPolygons()
elif operation == 'union':
polygons = a.union(b).toPolygons()
elif operation == 'intersect':
polygons = a.intersect(b).toPolygons()
else:
raise Exception('Unknown operation: '%s'' % operation)
except RuntimeError as e:
raise RuntimeError(e)
sys.setrecursionlimit(recursionlimit)
for polygon in polygons:
n = polygon.plane.normal
indices = []
for v in polygon.vertices:
pos = [v.pos.x, v.pos.y, v.pos.z]
if not pos in self.vertices:
self.vertices.append(pos)
self.vnormals.append([])
index = self.vertices.index(pos)
indices.append(index)
self.vnormals[index].append(v.normal)
self.faces.append(indices)
self.normals.append([n.x, n.y, n.z])
self.colors.append(polygon.shared)
# setup vertex-normals
ns = []
for vns in self.vnormals:
n = Vector(0.0, 0.0, 0.0)
for vn in vns:
n = n.plus(vn)
n = n.dividedBy(len(vns))
ns.append([a for a in n])
self.vnormals = ns
def render(self):
if self.list < 0:
self.list = glGenLists(1)
glNewList(self.list, GL_COMPILE)
for n, f in enumerate(self.faces):
glMaterialfv(GL_FRONT, GL_DIFFUSE, self.colors[n])
glMaterialfv(GL_FRONT, GL_SPECULAR, self.colors[n])
glMaterialf(GL_FRONT, GL_SHININESS, 50.0)
glColor4fv(self.colors[n])
glBegin(GL_POLYGON)
if self.colors[n][0] > 0:
glNormal3fv(self.normals[n])
for i in f:
if self.colors[n][1] > 0:
glNormal3fv(self.vnormals[i])
glVertex3fv(self.vertices[i])
glEnd()
glEndList()
glCallList(self.list)
renderable = None
def init():
# Enable a single OpenGL light.
glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient)
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse)
glLightfv(GL_LIGHT0, GL_POSITION, light_position)
glEnable(GL_LIGHT0);
glEnable(GL_LIGHTING);
# Use depth buffering for hidden surface elimination.
glEnable(GL_DEPTH_TEST);
# Setup the view of the cube.
glMatrixMode(GL_PROJECTION);
gluPerspective(40.0, 640./480., 1.0, 10.0);
glMatrixMode(GL_MODELVIEW);
gluLookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.)
def display():
global rot
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glPushMatrix()
glTranslatef(0.0, 0.0, -1.0);
glRotatef(rot, 1.0, 0.0, 0.0);
glRotatef(rot, 0.0, 0.0, 1.0);
rot += 0.1
renderable.render()
glPopMatrix()
glFlush()
glutSwapBuffers()
glutPostRedisplay()
if __name__ == '__main__':
parser = OptionParser()
parser.add_option('-o', '--operation', dest='operation',
type='str', default='subtract')
(options, args) = parser.parse_args()
renderable = TestRenderable(options.operation)
glutInit()
glutInitWindowSize(640,480)
glutCreateWindow("CSG Test")
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA)
glutDisplayFunc(display)
init()
glutMainLoop()

Answer 1

在Windows系统上与pip install pyopengl一起安装pyopengl时存在一个问题。

转到非官方Windows二进制文件for Python扩展包

下载PyOpenGL的32位或64位包，提供对OpenGL, GLUT和GLE的绑定
(例如:
PyOpenGL 3.1.5——cp39 cp39——win_amd64。whl和
PyOpenGL_accelerate‑3.1.5‑cp39‑cp39‑win_amd64.whl)

以管理员身份打开命令提示符(cmd.exe)切换到下载目录，通过pip install packagename.whl安装包。

例句:

pip install PyOpenGL‑3.1.5‑cp39‑cp39‑win_amd64.whl

和

pip install PyOpenGL_accelerate‑3.1.5‑cp39‑cp39‑win_amd64.whl

如果包已经安装，但不工作，那么你必须忽略当前安装的包，通过选项--ignore-installed:

pip install --ignore-installed PyOpenGL‑3.1.5‑cp39‑cp39‑win_amd64.whl

pip install --ignore-installed PyOpenGL_accelerate‑3.1.5‑cp39‑cp39‑win_amd64.whl