Random Cube Position

We know our end goal is to have a 3D version of the originally-2d game that we built. To do that, we need to have cubes randomly spawning in various positions, and that's what we'll be focusing on here.

In order to generate randomly, let's use the random module. Add the following import to the top of your script:

import random

 

Then we just need to modify our original translate a bit:

    glTranslatef(random.randrange(-5,5),0, -30)

Missed something? Here's the full code up to this point:

import pygame
from pygame.locals import *

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

######
import random

verticies = (
    (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)
    )


colors = (
    (1,0,0),
    (0,1,0),
    (0,0,1),
    (0,1,0),
    (1,1,1),
    (0,1,1),
    (1,0,0),
    (0,1,0),
    (0,0,1),
    (1,0,0),
    (1,1,1),
    (0,1,1),
    )


def Cube():
    glBegin(GL_QUADS)
    
    for surface in surfaces:
        x = 0

        for vertex in surface:
            x+=1
            glColor3fv(colors[x])
            glVertex3fv(verticies[vertex])
        
    glEnd()
    


    
    glBegin(GL_LINES)
    for edge in edges:
        for vertex in edge:
            glVertex3fv(verticies[vertex])
    glEnd()


def main():
    pygame.init()
    display = (800,600)
    pygame.display.set_mode(display, DOUBLEBUF|OPENGL)


    
    
    gluPerspective(45, (display[0]/display[1]), 0.1, 50.0)


    #start further back
    glTranslatef(random.randrange(-5,5),0, -30)


    # no more rotate
    #glRotatef(25, 2, 1, 0)


    object_passed = False

    while not object_passed:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()

            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    glTranslatef(-0.5,0,0)
                if event.key == pygame.K_RIGHT:
                    glTranslatef(0.5,0,0)

                if event.key == pygame.K_UP:
                    glTranslatef(0,1,0)
                if event.key == pygame.K_DOWN:
                    glTranslatef(0,-1,0)
            '''
            if event.type == pygame.MOUSEBUTTONDOWN:
                if event.button == 4:
                    glTranslatef(0,0,1.0)

                if event.button == 5:
                    glTranslatef(0,0,-1.0)
            '''

        
        x = glGetDoublev(GL_MODELVIEW_MATRIX)#, modelviewMatrix)

        camera_x = x[3][0]
        camera_y = x[3][1]
        camera_z = x[3][2]

        #print(camera_x,camera_y,camera_z)
        

        # slowly move:
        glTranslatef(0,0,0.5)


        
        glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
        Cube()
        pygame.display.flip()


        if camera_z <= 0:
            object_passed = True
            

for x in range(10000):
    main()

The next tutorial: Adding Many Cubes to our Game