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pytracing.py
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pytracing.py
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import numpy as np
from matplotlib import pyplot as plt
from pynput import keyboard, mouse
from numba import njit
def main():
global key; key = None # register keypresses
listener = keyboard.Listener(on_press=on_press);listener.start()
size = 15 # size of the map
posx, posy, posz = (1, np.random.randint(1, size -1), 0.5) # player pos
rot, rot_v = (np.pi/4, 0) # player rotation
lx, ly, lz = (size/2-0.5, size/2-0.5, 1) # light source
mapc, maph, mapr, exitx, exity = maze_generator(posx, posy, size)# map
mod = 1 # resolution modifier
inc = 0.05/mod # ray increment
height, width = (int(45*mod), int(60*mod)) # resolution
ax = plt.figure().gca()
img = ax.imshow(np.random.rand(height, width, 3))
plt.axis('off'); plt.tight_layout()
while 1: # main game loop
pixels = []
for j in range(height): # vertical loop
rot_j = rot_v + np.deg2rad(24 - j/mod)
for i in range(width): # horizontal vision loop
rot_i = rot + np.deg2rad(i/mod - 30)
sin, cos, = (inc*np.sin(rot_i), inc*np.cos(rot_i))
sinz = inc*np.sin(rot_j)
c, x, y, z, dtol = view_ray(posx, posy, posz, cos, sin, sinz, mapc, lx, ly, lz, maph, exitx, exity)
if z < 1:
c = shadow_ray(x, y, z, lx, ly, lz, maph, c, inc, dtol)
if mapr[int(x)][int(y)] != 0 and z > 0:
c = reflection(x, y, z, cos, sin, sinz, mapc, lx, ly, lz, maph, exitx, exity, c, posz, inc, mapr, recur=False)
pixels.append(c)
pixels = np.reshape(pixels, (height,width,3))
pixels = np.asarray(pixels)/np.sqrt(np.max(pixels))
img.set_array(pixels); plt.draw(); plt.pause(0.0001)
rot, rot_v = rotation(rot, rot_v)
posx, posy, rot, rot_v, keyout = movement(posx, posy, rot, rot_v, maph)
if (int(posx) == exitx and int(posy) == exity) or keyout == 'esc':
break
plt.close()
listener.stop()
def maze_generator(x, y, size):
mapc = np.random.uniform(0,1, (size,size,3))
mapr = np.random.choice([0, 0, 0, 0, 1], (size,size))
maph = np.random.choice([0, 0, 0, 0, 0, 0, 0, .3, .4, .7, .9], (size,size))
maph[0,:], maph[size-1,:], maph[:,0], maph[:,size-1] = (1,1,1,1)
mapc[x][y], maph[x][y], mapr[x][y] = (0, 0, 0)
count = 0
while 1:
testx, testy = (x, y)
if np.random.uniform() > 0.5:
testx = testx + np.random.choice([-1, 1])
else:
testy = testy + np.random.choice([-1, 1])
if testx > 0 and testx < size -1 and testy > 0 and testy < size -1:
if maph[testx][testy] == 0 or count > 5:
count = 0
x, y = (testx, testy)
mapc[x][y], maph[x][y], mapr[x][y] = (0, 0, 0)
if x == size-2:
exitx, exity = (x, y)
break
else:
count = count+1
return mapc, maph, mapr, exitx, exity
def rotation(rot, rot_v):
with mouse.Controller() as check:
position = check.position
if abs(960-position[0]) > 200:
dx = (960 - position[0])/4800# 1080p
rot = np.real(rot - dx)
if abs(540 - position[1]) > 200:
dy = (540 - position[1])/2700# 1080p screen
rot_v = np.real(rot_v + dy)
return(rot, rot_v)
def on_press(key_new):
global key
key = key_new
def movement(posx, posy, rot, rot_v, maph):
global key
x, y = (posx, posy)
keyout = None
if key is not None:
if key == keyboard.Key.up:
x, y = (x + 0.3*np.cos(rot), y + 0.3*np.sin(rot))
elif key == keyboard.Key.down:
x, y = (x - 0.3*np.cos(rot), y - 0.3*np.sin(rot))
elif key == keyboard.Key.left:
rot = rot - np.pi/8
elif key == keyboard.Key.right:
rot = rot + np.pi/8
elif key == keyboard.Key.end:
rot_v = rot_v - np.pi/16
elif key == keyboard.Key.home:
rot_v = rot_v + np.pi/16
elif key == keyboard.Key.esc:
keyout = 'esc'
key = None
if maph[int(x)][int(y)] == 0:
posx, posy = (x, y)
return posx, posy, rot, rot_v, keyout
@njit(fastmath=True)
def fast_ray(x, y, z, cos, sin, sinz, maph):
while 1:
x, y, z = x + cos, y + sin, z + sinz
if (z > 1 or z < 0):
break
if maph[int(x)][int(y)] > z:
break
return x, y, z
def view_ray(x, y, z, cos, sin, sinz, mapc, lx, ly, lz, maph, exitx, exity):
x, y, z = fast_ray(x, y, z, cos, sin, sinz, maph)
if z > 1: # ceiling
if (x-lx)**2 + (y-ly)**2 < 0.1: #light source
c = np.asarray([1,1,1])
elif int(np.rad2deg(np.arctan((y-ly)/(x-lx)))/6)%2 ==1:
c = np.asarray([.6,1,1])
else:
c = np.asarray([1,1,0.6])
elif z < 0: # floor
if int(x) == exitx and int(y) == exity:
c = np.asarray([0,0,.6])
elif int(x*2)%2 == int(y*2)%2:
c = np.asarray([.1,.1,.1])
else:
c = np.asarray([.8,.8,.8])
elif z < maph[int(x)][int(y)]:
c = np.asarray(mapc[int(x)][int(y)])
else:
c = np.asarray([.5,.5,.5]) # last resort
dtol = np.sqrt((x-lx)**2+(y-ly)**2+(lz-1)**2)
h = 0.3 + 0.7*np.clip(1/dtol, 0, 1)
c = c*h
return c, x, y, z, dtol
@njit(fastmath=True)
def shadow_ray(x, y, z, lx, ly, lz, maph, c, inc, dtol):
dx, dy, dz = [(lx-x)/dtol, (ly-y)/dtol, (lz-z)/dtol]
mod = 1
while 1:
x, y, z = (x + .1*dx, y + .1*dy, z + .1*dz)
if maph[int(x)][int(y)]!= 0 and z<= maph[int(x)][int(y)]:
mod = mod*0.9
if mod < 0.5:
break
elif z > 0.9:
break
return c*mod
def reflection(x, y, z, cos, sin, sinz, mapc, lx, ly, lz, maph, exitx, exity, c, posz, inc, mapr, recur):
if abs(z-maph[int(x)][int(y)])<abs(sinz):
sinz = -sinz
elif maph[int(x+cos)][int(y-sin)] != 0:
cos = -cos
else:
sin = -sin
c2, x, y, z, dtol = view_ray(x, y, z, cos, sin, sinz, mapc, lx, ly, lz, maph, exitx, exity)
if z < 1:
c2 = shadow_ray(x, y, z, lx, ly, lz, maph, c2, inc, dtol)
if (mapr[int(x)][int(y)] != 0 and z < 1 and z > 0 and not recur):
c2 = reflection(x, y, z, cos, sin, sinz, mapc, lx, ly, lz, maph, exitx, exity, c2, posz, inc, mapr, recur=True)
c = (c + c2)/2
return c
if __name__ == '__main__':
main()