print("start")
origin = [1,1,1]
direction = [1,0,0]

screen = [0] * (SCREEN_WIDTH*SCREEN_HEIGHT)

for sx in range(SCREEN_WIDTH):
    print("x column = " + str(sx))
    for sy in range (SCREEN_HEIGHT):
        voxel = raytrace(o,d)
        screen[sx + sy*SCREEN_WIDTH] = voxel
print("konec")