Question

运行此代码时，我遇到了一个非常奇怪的问题。我也不知道它应该如何与OpenGL Api发生冲突。下面是代码：

import sys
sys.path.append("..\Blocks")
print sys.path
import pygame
from pygame.locals import *
from OpenGL.GL import *
from OpenGL.GLU import *

import random

try:
    import BlockModel
except:
    print "Cant Find Block Model"

def createBlock():  
    block = BlockModel.Block()

    blockVertices = block.returnVertices()

    blockEdges = block.returnEdges()

    blockSurface = block.returnSurface()

    glBegin(GL_QUADS)

    for surface in blockSurface:
        for faceVertex in surface:
            glVertex3fv(blockVertices[faceVertex])

    glEnd

    glBegin(GL_LINES)
    for edge in blockEdges:
        for vertex in edge:
            glVertex3fv(blockVertices[vertex])
    glEnd()

def main():
    pygame.init()
    display = (800, 600)
    pygame.display.set_mode(display, DOUBLEBUF|OPENGL)
    gluPerspective(15, (display[0]/display[1]), 0.1, 50.0)

    glTranslatef(random.randrange(-5,5),random.randrange(-5,5), -40)

    exit = False

    while not exit:
        pygame.time.wait(10)
        glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
        createBlock()
        pygame.display.flip()
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()


main()

尝试运行程序时出现此错误：

C:\Users\Haavard\Desktop\MinecraftPythonProject\framework>python main.py
['C:\\Users\\Haavard\\Desktop\\MinecraftPythonProject\\framework', 'C:\\Windows\
\system32\\python27.zip', 'C:\\Python27\\DLLs', 'C:\\Python27\\lib', 'C:\\Python
27\\lib\\plat-win', 'C:\\Python27\\lib\\lib-tk', 'C:\\Python27', 'C:\\Python27\\
lib\\site-packages', 'C:\\Python27\\lib\\site-packages\\PIL', '..\\Blocks']
Traceback (most recent call last):
  File "main.py", line 60, in <module>
    main()
  File "main.py", line 52, in main
    createBlock()
  File "main.py", line 37, in createBlock
    glEnd()
  File "latebind.pyx", line 44, in OpenGL_accelerate.latebind.Curry.__call__ (c:
\Users\mcfletch\OpenGL-dev\OpenGL-ctypes\OpenGL_accelerate\src\latebind.c:1201)
  File "C:\Python27\lib\site-packages\OpenGL\GL\exceptional.py", line 46, in glE
nd
    return baseFunction( )
  File "C:\Python27\lib\site-packages\OpenGL\platform\baseplatform.py", line 402
, in __call__
    return self( *args, **named )
  File "errorchecker.pyx", line 53, in OpenGL_accelerate.errorchecker._ErrorChec
ker.glCheckError (c:\Users\mcfletch\OpenGL-dev\OpenGL-ctypes\OpenGL_accelerate\s
rc\errorchecker.c:1218)
OpenGL.error.GLError: GLError(
        err = 1282,
        description = 'invalid operation',
        baseOperation = glEnd,
        cArguments = ()
)

我在惠普机器上的Windows 7上运行。

块模型模块如下所示：

class Block:

    # initializing the basic functions of a block
    def __init__(self, blockID = "0", blockType = "stone", verticesCords = ((1,-1,-1),(1,1,-1),(-1,1,-1),(-1,-1,-1),(1,-1,1),(1,1,1),(-1,-1,1),(-1,1,1)), edges = ((0,1),(0,3),(0,4),(2,1),(2,3),(2,7),(6,3),(6,4),(6,7),(5,1),(5,4),(5,7)), surfaces = (((0,1,2,3),(3,2,7,6),(6,7,5,4),(4,5,1,0),(1,5,7,2),(4,0,3,6)))):
        # Block Placement
        self.PLACEMENT = verticesCords
        # Block identity in the world
        self.EDGES = edges
        self.SURFACE = surfaces
        self.BLOCKID = blockID
        # The block type
        self.BLOCKTYPE = blockType

    # A function letting the framework know its placement.
    def returnVertices(self):
        return self.PLACEMENT

    def returnEdges(self):
        return self.EDGES

    def returnSurface(self):
        return self.SURFACE

    # A function to make the block fetch its own texture.
    def defineTexture():
        pass

感谢您的回复！：）

Answer 1

您可能已经解决了这个问题，但我的猜测是您的边缘可能有奇数个顶点。 glEnd（）上的1282错误只是意味着整个操作出现了问题。 GL_LINES期望给出偶数个顶点，因为GL_LINES在成对的点中工作以定义每个线段，而不是用于形成大折线的连续点串。仔细检查每条边有两个点。

Answer 2

您似乎没有正确结束GL_QUADS进程。您正在调用glEnd，而不是glEnd（）。我不知道这是不是问题，但这绝对是错误的。如果您有多次尝试，可能需要指定要结束的过程，例如如果当前有多个准备，则使用glEnd（GL_LINES）或glEnd（GL_QUADS），这就是为什么成功调用glEnd（）时会发生错误的原因；您并没有告诉它应该结束。

希望这会有所帮助

Answer 3

您应该从()行第37行中删除glEnd()，代码应该可以正常工作。

PyOpenGL中的glEnd错误错误= 1282

3 个答案: