Mar-23-2019, 01:18 AM
Ok so I found a tutorial on how to make a ray-caster eliminating the need for fish eye correction, heres the link, https://lodev.org/cgtutor/raycasting.html. I don't really understand much of the math but I do understand the fundamentals and how to tweak the code and so I was able to make walls with a second floor over in this link, https://trinket.io/python/acfadf20d9, but the ray-caster here is a bit slow so I made one in scratch just to show the intended performance here, https://scratch.mit.edu/projects/295707150/(click "See inside" on the top right before you play it). So the problem is that I don't know how to render walls that are shorter than the players height and I couldn't find any sources that could help me. help?
import turtle
import math
import pygame
pygame.init()
pygame.display.set_mode()
events = pygame.event.get()
# This raycaster now has different wall hieghts
mymap = [
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,2,2,2,2,2,2,2,0,0,0,0,2,2,2,2,2,2,2,2],
[1,0,0,0,0,2,0,0,0,0,0,2,0,0,0,0,2,0,0,0,0,0,0,2],
[1,0,0,0,0,2,0,0,0,0,0,2,2,2,2,2,2,0,0,0,0,0,0,2],
[1,0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2],
[1,0,0,0,0,2,0,0,0,0,0,2,2,2,2,2,2,0,0,0,0,0,0,2],
[1,0,0,0,0,2,0,0,0,0,0,2,0,0,0,0,2,0,0,0,0,0,0,2],
[1,0,0,0,0,2,2,2,2,2,2,2,0,0,0,0,2,2,2,2,2,2,2,2],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
]
mymap2 = [
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,2,0,2,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,2,0,2,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
]
screen = turtle.Screen()
screen.bgpic("sky.jpg")
posX = 20
posY = 12
dirX = -1
dirY = 0
planeX = 0
planeY = 0.66
rotSpeed = 9
w = 450
h = 300
x = 0
walk = 150
ree = turtle.Turtle()
ree.hideturtle()
ree.pensize(7)
ree.speed(0)
ree.penup()
ree.tracer(0, 0)
sword = turtle.Turtle()
swd1 = "sword.png"
screen.addshape(swd1)
sword.shape(swd1)
sword.setheading(90)
sword.setx(30)
sword.sety(-111)
user = "fdasfas"
while True:
x = 0
for event in pygame.event.get():
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
olddirX = dirX
dirX = dirX * math.cos(math.radians(rotSpeed)) - dirY * math.sin(math.radians(rotSpeed))
dirY = olddirX * math.sin(math.radians(rotSpeed)) + dirY * math.cos(math.radians(rotSpeed))
oldplaneX = planeX
planeX = planeX * math.cos(math.radians(rotSpeed)) - planeY * math.sin(math.radians(rotSpeed))
planeY = oldplaneX * math.sin(math.radians(rotSpeed)) + planeY * math.cos(math.radians(rotSpeed))
ree.clear()
break
if event.key == pygame.K_RIGHT:
olddirX = dirX
dirX = dirX * math.cos(math.radians(-rotSpeed)) - dirY * math.sin(math.radians(-rotSpeed))
dirY = olddirX * math.sin(math.radians(-rotSpeed)) + dirY * math.cos(math.radians(-rotSpeed))
oldplaneX = planeX
planeX = planeX * math.cos(math.radians(-rotSpeed)) - planeY * math.sin(math.radians(-rotSpeed))
planeY = oldplaneX * math.sin(math.radians(-rotSpeed)) + planeY * math.cos(math.radians(-rotSpeed))
ree.clear()
break
if event.key == pygame.K_UP:
posX += dirX * 0.5
posY += dirY * 0.5
ree.clear()
break
if event.key == pygame.K_DOWN:
posX -= dirX * 0.5
posY -= dirY * 0.5
ree.clear()
break
while x < 600:
cameraX = 2 * x / w - 1
raydirX = dirX + planeX * cameraX
raydirY = dirY + planeY * cameraX
mapX = math.floor(posX)
mapY = math.floor(posY)
sidedistX = 0
sidedistY = 0
deltadistX = abs(1 / raydirX)
deltadistY = abs(1 / raydirY)
#print x
perpwalldist = 0
stepX = 0
stepY = 0
hit = 0
side = 0
if raydirX < 0:
stepX = -1
sidedistX = (posX - mapX) * deltadistX
else:
stepX = 1
sidedistX = (mapX + 1.0 - posX) * deltadistX
if raydirY < 0:
stepY = -1
sidedistY = (posY - mapY) * deltadistY
else:
stepY = 1
sidedistY = (mapY + 1.0 - posY) * deltadistY
while hit == 0:
if sidedistX < sidedistY:
sidedistX += deltadistX
mapX += stepX
side = 0
else:
sidedistY += deltadistY
mapY += stepY
side = 1
if (mymap[mapY][mapX] > 0):
hit = 1
if side == 0:
perpwalldist = (mapX - posX + (1 - stepX) / 2) / raydirX
else:
perpwalldist = (mapY - posY + (1 - stepY) / 2) / raydirY
lineheight = math.floor(h / perpwalldist)
# 2nd floor_____________________________________________________________________
cameraX = 2 * x / w - 1
raydirX = dirX + planeX * cameraX
raydirY = dirY + planeY * cameraX
mapX2 = math.floor(posX)
mapY2 = math.floor(posY)
sidedistX2 = 0
sidedistY2 = 0
deltadistX2 = abs(1 / raydirX)
deltadistY2 = abs(1 / raydirY)
perpwalldist2 = 0
stepX2 = 0
stepY2 = 0
hit2 = 0
side2 = 0
if raydirX < 0:
stepX2 = -1
sidedistX2 = (posX - mapX2) * deltadistX2
else:
stepX2 = 1
sidedistX2 = (mapX2 + 1.0 - posX) * deltadistX2
if raydirY < 0:
stepY2 = -1
sidedistY2 = (posY - mapY2) * deltadistY2
else:
stepY2 = 1
sidedistY2 = (mapY2 + 1.0 - posY) * deltadistY2
while hit2 == 0:
if sidedistX2 < sidedistY2:
sidedistX2 += deltadistX2
mapX2 += stepX2
side2 = 0
else:
sidedistY2 += deltadistY2
mapY2 += stepY2
side2 = 1
if (mymap2[mapY2][mapX2] > 0 and mymap[mapY2][mapX2] > 0):
hit2 = 1
if side2 == 0:
perpwalldist2 = (mapX2 - posX + (1 - stepX2) / 2) / raydirX
else:
perpwalldist2 = (mapY2 - posY + (1 - stepY2) / 2) / raydirY
lineheight2 = math.floor(h / perpwalldist2) * 3
# end 2nd floor__________________________________________________________________
drawstart = -lineheight / 2 + h / 2
drawend = lineheight / 2 + h / 2
# 2nd drawend__________________________
drawend2 = lineheight2 / 2 + h / 2
# END 2nd drawend______________________
if mymap2[mapY2][mapX2] == 1:
if side2 == 0:
ree.color("blue")
elif side2 == 1:
ree.color("Mediumblue")
elif mymap2[mapY2][mapX2] == 2:
if side2 == 0:
ree.color("Darkgray")
elif side2 == 1:
ree.color("Gray")
if drawend2 > drawend:
ree.setx(x - 240)
ree.sety(drawend2 - walk)
ree.pendown()
ree.sety(drawend - walk)
ree.penup()
if mymap[mapY][mapX] == 1:
if side == 0:
ree.color("blue")
elif side == 1:
ree.color("Mediumblue")
elif mymap[mapY][mapX] == 2:
if side == 0:
ree.color("Darkgray")
elif side == 1:
ree.color("Gray")
ree.setx(x - 240)
ree.sety(drawend - walk)
ree.pendown()
ree.sety(drawstart - walk)
ree.color("darkgreen")
ree.sety(-200)
ree.penup()
x += 5
if x == 220:
x = 220.000001
ree.update()