试图在pyOpenGL中绘制一个简单的正方形

问题描述

我正在尝试使用pyopengl自学OpenGL，并且尝试绘制一个以原点为中心的简单2D正方形而感到惊讶.每当我将数组值设置为大于或等于1时，形状就会占据整个屏幕，就好像我只是在查看轴的一小部分一样.我试图以pyopengl重写的NeHe教程为基础，但我找不到我做错的事情.

I'm trying to teach myself OpenGL using pyopengl and I'm struck on trying to render a simple 2D square centered at the origin. Whenever I set an array value greater than or equal to 1, the shape takes up the entire screen as if I am only viewing a small section of the axis. I have tried to base it off the NeHe tutorials rewritten in pyopengl but I can't find what I'm doing wrong.

from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *

def display():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

    glBegin(GL_QUADS)
    glVertex3f(2,-2,0)
    glVertex3f(2,2,0)
    glVertex3f(-2,2,0)
    glVertex3f(-2,-2,0)
    glEnd()

    glutSwapBuffers()

if __name__ == '__main__':
    glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH)
    glutInitWindowSize(640,480)
    glutCreateWindow("Hello World :'D")

    glutDisplayFunc(display)
    glutIdleFunc(display)
    glutMainLoop()

推荐答案

尝试设置非默认投影矩阵:

Try setting a non-default projection matrix:

def display():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)

    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    glOrtho( 0, 640, 0, 480, -10, 10)
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()

    ...

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