python - VBO PyOpenGL点

目前，我正在使用PyOpenGL和GLUT，只是想用VBO可视化屏幕上的某些点。
我对使用PyOpenGL编程很陌生，所以也许代码根本不好。但应该在我看来有效。
但是我总得一分。有人知道，为什么？

感谢您的帮助！

import sys
import random #for random numbers
from OpenGL.GL import * #for definition of points
from OpenGL.GLU import *
from OpenGL.GLUT import * #for visualization in a window
import numpy as np

AMOUNT = 10
DIMENSION = 3

def changePoints(points):
    for i in range(0, 3*AMOUNT):
        x = random.uniform(-1.0, 1.0)
        points[i]= points[i]*x
    print(points)
    return points

def displayPoints(points):
    vbo=GLuint(0) # init the Buffer in Python!
    glGenBuffers(1, vbo) # generate a buffer for the vertices
    glBindBuffer(GL_ARRAY_BUFFER, vbo) #bind the vertex buffer
    glBufferData(GL_ARRAY_BUFFER,sys.getsizeof(points), points, GL_STREAM_DRAW)
    glBindBuffer(GL_ARRAY_BUFFER, vbo) #bind the vertex buffer

    glEnableClientState(GL_VERTEX_ARRAY) # enable Vertex Array
    glVertexPointer(DIMENSION, GL_FLOAT,0, ctypes.cast(0, ctypes.c_void_p))
    glBindBuffer(GL_ARRAY_BUFFER, vbo) #bind the vertex buffer
    glDrawArrays(GL_POINTS, 0, AMOUNT)
    glDisableClientState(GL_VERTEX_ARRAY) # disable the Vertex Array
    glDeleteBuffers(1, vbo)

##creates Points
def Point():

    points = np.arange(AMOUNT*3)
    np.ascontiguousarray(points, dtype = np.float32)

    points = changePoints(points)

    #Visualization
    displayPoints(points)


##clears the color and depth Buffer, call Point() and swap the buffers of the current window
def display():
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
    Point()
    glutSwapBuffers()

def main():
    ##initials GLUT
    glutInit(sys.argv)
    #sets the initial display mode (selects a RGBA mode window; selects a double buffered window; selects a window with a depth buffer)
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH)
    #defines the size of the Window
    glutInitWindowSize(800, 1600)
    #creates a window with title
    glutCreateWindow(b'Points') #!string as title is causing a error, because underneath the PyOpenGL call is an old-school C function expecting ASCII text. Solution: pass the string in byte format.
    glutDisplayFunc(display) #sets the display callback for the current window.
    glutMainLoop() #enters the GLUT event processing loop.

main()

最佳答案

如果不使用任何投影矩阵，则必须在归一化设备空间中设置点的顶点坐标，该范围从（-1，-1，-1）到（1，1，1）。该体积将投影到视口。

要解决您的问题，points必须是数据类型为np.float32的元素数组：

def Point():

    points = np.arange(AMOUNT*3, dtype = np.float32)
    points = changePoints(points)

    #Visualization
    displayPoints(points)

点的坐标必须在[-1.0，1.0]范围内：

def changePoints(points):
for i in range(len(points)):
    points[i] = random.uniform(-1.0, 1.0)
print(points)
return points