I want to draw a house with Python OpenGL.
It should look like this:
filled:
unfilled:
Further information: The house should rotate via key input around the x- and y-axis. By pressing the F-key, it should switch between filled and unfilled mode.
My Problem: The window opens up, but I don't see anything on it. I'm not sure what exactly is wrong here or what I'm missing for drawing. Can somebody explain it?
This is my code:
import pygame
from pygame.locals import *
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
# from OpenGL.GL import shaders
# from OpenGL.arrays import vbo
# import numpy as np
# general all vertices needed
vertices = (
# front wall
(2, 0, -1, 2, 1, -1, -2, 1, -1, -2, 0, -1),
# back wall
(2, 0, 1, 2, 1, 1, -2, 1, 1, -2, 0, 1, 2, 2, 0, -2, 2, 0),
# roof ridge
(2.2, 2, 0, -2.2, 2, 0),
# roof edges
(2.2, 0.9, -1.1, -2.2, 0.9, -1.1, 2.2, 0.9, 1.1, -2.2, 0.9, 1.1),
# chimney
(1, 0, 0.5, 1.25, 0, 0.5, 1.25, 0, 0.25, 1, 0, 0.25,
1, 2.5, 0.5, 1.25, 2.5, 0.5, 1.25, 2.5, 0.25, 1, 2.5, 0.25)
)
def DrawHouse():
# house
# back wall
glBegin(GL_LINES)
glColor3f(0.5, 0.5, 0.5)
glVertex3f(2, 0, -1) # top left
glVertex3f(2, 1, -1) # top right
glVertex3f(-2, 1, -1) # bottom right
glVertex3f(-2, 0, -1) # bottom left
glEnd()
# front wall
glBegin(GL_LINES)
glColor3f(0.5, 0.5, 0.5)
glVertex3f(2, 0, 1) # top left
glVertex3f(2, 1, 1) # top right
glVertex3f(-2, 1, 1) # bottom right
glVertex3f(-2, 0, 1) # bottom right
glVertex3f(2, 2, 0) # rooftop
glVertex3f(-2, 2, 0) # rooftop
glEnd()
# roof
glBegin(GL_LINES)
# roof ridge
glColor3f(0, 0, 0)
glVertex3f(2.2, 2, 0)
glVertex3f(-2.2, 2, 0)
glEnd()
# roof edges
glBegin(GL_TRIANGLES)
glColor3f(0, 0, 0)
glVertex3f(2.2, 0.9, -1.1)
glVertex3f(-2.2, 0.9, -1.1)
glVertex3f(2.2, 0.9, 1.1)
glVertex3f(-2.2, 0.9, 1.1)
glEnd()
# chimney
glBegin(GL_POLYGON)
glColor3f(1, 1, 0)
glVertex3f(1, 0, 0.5)
glVertex3f(1.25, 0, 0.5)
glVertex3f(1.25, 0, 0.25)
glVertex3f(1, 0, 0.25)
glVertex3f(1, 2.5, 0.5)
glVertex3f(1.25, 2.5, 0.5)
glVertex3f(1.25, 2.5, 0.25)
glVertex3f(1, 2.5, 0.25)
glEnd()
def init():
# Switch on z-buffer for calculation of hidden surfaces
glEnable(GL_DEPTH_TEST)
# Display front and back of polygons as border lines only
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE)
def reshape():
# initialize projection matrix, to 60 degrees horizontal field of view
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(60.0, 1.0, 1.0, 200.0) # angle, aspect, near and far clip
# make modelview matrix the current matrix again
glMatrixMode(GL_MODELVIEW)
def main():
pygame.init()
window = (800, 800)
display = pygame.display.set_mode(window, DOUBLEBUF | OPENGL)
pygame.display.set_caption('Haus')
clock = pygame.time.Clock()
# GLUT.glutInitDisplayMode(GLUT_DEPTH | GLUT_RGB | GLUT_DOUBLE) # request render context with z-buffer, doublebuffer for rgb mode
gluOrtho2D(0, 800, 0, 800)
rotX = 0.0
rotY = 0.0
polygonMode = GL_LINE
while True:
clock.tick(100)
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
keys = pygame.key.get_pressed() # checking pressed keys
if keys[pygame.K_d]: # The keys 'a' and 'd' should rotate the house around the y-axis
rotX -= 5
if keys[pygame.K_a]:
rotX += 5
if keys[pygame.K_w]: # the keys 'w' and 'd' should rotate the house around the x-axis
rotY -= 5
if keys[pygame.K_d]:
rotY += 5
if keys[pygame.K_f]: # Key 'f' is to switch between wireframe and filled surfaces
if polygonMode is GL_FILL:
polygonMode = GL_LINE
else:
polygonMode = GL_FILL
# Switch polygon display between outline and filled
glPolygonMode(GL_FRONT_AND_BACK, polygonMode)
# GLUT.glutPostRedisplay() # render image again
# remove Framebuffer and Z-Buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
# initialise Modelview Matrix
glLoadIdentity()
# execute Modeltransformation
glTranslatef(0, 0, -3) # shift by -3 in z-direction
glRotatef(rotY, 0, 1, 0) # rotate y-achse
glRotatef(rotX, 1, 0, 0) # rotate x-achse
glTranslatef(-0.5, -0.5, -0.5) # shift by -0.5 in all directions
# copy Back-Buffer in Front-Buffer
# swapBuffers()
DrawHouse()
# Show the screen
pygame.display.flip()
# callback functions
# glutReshapeFunc(reshape)
if __name__ == "__main__":
main()
The coordinates of your geometry are in range [-2.2, 2.2]. However you set an orthographic projection in range [0, 800]:
gluOrtho2D(0, 800, 0, 800)
Actually there are 3 reasons why you don't see anything
That results in only a few pixels being drawn on the bottom left of the screen.
gluOrtho2D creates an orthographic projection with a near plane of -1 and a far plane of 1. This will clip your geometry.
You need to choose the GL_PROJECTION for the current matrix. Later in your code, the model view matrix is set to the identity matrix with glLoadIdentity.
def main():
pygame.init()
window = (800, 800)
display = pygame.display.set_mode(window, DOUBLEBUF | OPENGL)
pygame.display.set_caption('Haus')
clock = pygame.time.Clock()
# gluOrtho2D(0, 800, 0, 800)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(-5, 5, -5, 5, -5, 5)
glMatrixMode(GL_MODELVIEW)
# [...]
Alternatively you can use the perspective projection from the reshape function:
def main():
pygame.init()
window = (800, 800)
display = pygame.display.set_mode(window, DOUBLEBUF | OPENGL)
pygame.display.set_caption('Haus')
clock = pygame.time.Clock()
# gluOrtho2D(0, 800, 0, 800)
reshape()
# [...]
How do I add an image as texture in my cube:
I want to add my self-provided image as the surfaces of my cube while still having some lighting
I am using Visual Studio Code as my compiler
here is the code I copied:
import pygame
from pygame.locals import *
from OpenGL.GL import *
from OpenGL.GLU import *
verticies = (
( 1, -1, -1), # 0
( 1, 1, -1), # 1
(-1, 1, -1), # 2
(-1, -1, -1), # 3
( 1, -1, 1), # 4
( 1, 1, 1), # 5
(-1, -1, 1), # 6
(-1, 1, 1), # 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),
)
normals = [
( 0, 0, -1), # surface 0
(-1, 0, 0), # surface 1
( 0, 0, 1), # surface 2
( 1, 0, 0), # surface 3
( 0, 1, 0), # surface 4
( 0, -1, 0) # surface 5
]
colors = (
(1,1,1),
(0,1,0),
(0,0,1),
(0,1,0),
(0,0,1),
(1,0,1),
(0,1,0),
(1,0,1),
(0,1,0),
(0,0,1),
)
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),
)
def Cube():
glBegin(GL_QUADS)
for i_surface, surface in enumerate(surfaces):
x = 0
glNormal3fv(normals[i_surface])
for vertex in surface:
x+=1
glColor3fv(colors[x])
glVertex3fv(verticies[vertex])
glEnd()
glColor3fv(colors[0])
glBegin(GL_LINES)
for edge in edges:
for vertex in edge:
glVertex3fv(verticies[vertex])
glEnd()
def main():
global surfaces
pygame.init()
display = (800, 600)
pygame.display.set_mode(display, DOUBLEBUF|OPENGL)
clock = pygame.time.Clock()
glMatrixMode(GL_PROJECTION)
gluPerspective(45, (display[0]/display[1]), 0.1, 50.0)
glMatrixMode(GL_MODELVIEW)
glTranslatef(0, 0, -5)
#glLight(GL_LIGHT0, GL_POSITION, (0, 0, 1, 0)) # directional light from the front
glLight(GL_LIGHT0, GL_POSITION, (5, 5, 5, 1)) # point light from the left, top, front
glLightfv(GL_LIGHT0, GL_AMBIENT, (0, 0, 0, 1))
glLightfv(GL_LIGHT0, GL_DIFFUSE, (1, 1, 1, 1))
glEnable(GL_DEPTH_TEST)
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
glEnable(GL_LIGHTING)
glEnable(GL_LIGHT0)
glEnable(GL_COLOR_MATERIAL)
glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE )
glRotatef(1, 3, 1, 1)
Cube()
glDisable(GL_LIGHT0)
glDisable(GL_LIGHTING)
glDisable(GL_COLOR_MATERIAL)
pygame.display.flip()
clock.tick(60)
main()
The program displays a rotating cube with just colors as its surface
how can I change the surface?
Define the array of texture coordinates:
textureCoordinates = ((0, 0), (0, 1), (1, 1), (1, 0))
Set a white color, but specify the texture coordinates when you draw the cube:
def Cube():
glColor3f(1, 1, 1)
glBegin(GL_QUADS)
for i_surface, surface in enumerate(surfaces):
x = 0
glNormal3fv(normals[i_surface])
for i_vertex, vertex in enumerate(surface):
x+=1
#
glTexCoord2fv(textureCoordinates[i_vertex])
glVertex3fv(verticies[vertex])
glEnd()
Load an image with pygame.image.load(), create the texture object and enable 2 dimensional texturing before the application loop:
def main():
# [...]
image = pygame.image.load('image.png')
datas = pygame.image.tostring(image, 'RGBA')
texID = glGenTextures(1)
glBindTexture(GL_TEXTURE_2D, texID)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.get_width(), image.get_height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, datas)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glEnable(GL_TEXTURE_2D)
while True:
# [...]
Complete example:
import pygame
from pygame.locals import *
from OpenGL.GL import *
from OpenGL.GLU import *
verticies = (
( 1, -1, -1), # 0
( 1, 1, -1), # 1
(-1, 1, -1), # 2
(-1, -1, -1), # 3
( 1, -1, 1), # 4
( 1, 1, 1), # 5
(-1, -1, 1), # 6
(-1, 1, 1), # 7
)
textureCoordinates = ((0, 0), (0, 1), (1, 1), (1, 0))
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),
)
normals = [
( 0, 0, -1), # surface 0
(-1, 0, 0), # surface 1
( 0, 0, 1), # surface 2
( 1, 0, 0), # surface 3
( 0, 1, 0), # surface 4
( 0, -1, 0) # surface 5
]
colors = (
(1,1,1),
(0,1,0),
(0,0,1),
(0,1,0),
(0,0,1),
(1,0,1),
(0,1,0),
(1,0,1),
(0,1,0),
(0,0,1),
)
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),
)
def Cube():
glColor3f(1, 1, 1)
glBegin(GL_QUADS)
for i_surface, surface in enumerate(surfaces):
x = 0
glNormal3fv(normals[i_surface])
for i_vertex, vertex in enumerate(surface):
x+=1
#
glTexCoord2fv(textureCoordinates[i_vertex])
glVertex3fv(verticies[vertex])
glEnd()
glColor3fv(colors[0])
glBegin(GL_LINES)
for edge in edges:
for vertex in edge:
glVertex3fv(verticies[vertex])
glEnd()
def main():
global surfaces
pygame.init()
display = (400, 300)
pygame.display.set_mode(display, DOUBLEBUF|OPENGL)
clock = pygame.time.Clock()
glMatrixMode(GL_PROJECTION)
gluPerspective(45, (display[0]/display[1]), 0.1, 50.0)
glMatrixMode(GL_MODELVIEW)
glTranslatef(0, 0, -5)
#glLight(GL_LIGHT0, GL_POSITION, (0, 0, 1, 0)) # directional light from the front
glLight(GL_LIGHT0, GL_POSITION, (5, 5, 5, 1)) # point light from the left, top, front
glLightfv(GL_LIGHT0, GL_AMBIENT, (0, 0, 0, 1))
glLightfv(GL_LIGHT0, GL_DIFFUSE, (1, 1, 1, 1))
glEnable(GL_DEPTH_TEST)
image = pygame.image.load('image.png')
datas = pygame.image.tostring(image, 'RGBA')
texID = glGenTextures(1)
glBindTexture(GL_TEXTURE_2D, texID)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, image.get_width(), image.get_height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, datas)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glEnable(GL_TEXTURE_2D)
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
glEnable(GL_LIGHTING)
glEnable(GL_LIGHT0)
glEnable(GL_COLOR_MATERIAL)
glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE )
glRotatef(1, 3, 1, 1)
Cube()
glDisable(GL_LIGHT0)
glDisable(GL_LIGHTING)
glDisable(GL_COLOR_MATERIAL)
pygame.display.flip()
clock.tick(60)
main()
I can't seem to find the answer to this question anywhere. I realize that you have to use PyOpenGL or something similar to do OpenGL stuff, but I was wondering if its possible to do very basic 3D graphics without any other dependencies.
No, Pygame is a wrapper for SDL, which is a 2D api. Pygame doesn't provide any 3D capability and probably never will.
3D libraries for Python include Panda3D and DirectPython, although they are probably quite complex to use, especially the latter.
Well, if you can do 2d you can always do 3d. All 3d really is is skewed 2 dimensional surfaces giving the impression you're looking at something with depth. The real question is can it do it well, and would you even want to. After browsing the pyGame documentation for a while, it looks like it's just an SDL wrapper. SDL is not intended for 3d programming, so the answer to the real question is, No, and I wouldn't even try.
You can do pseudo-3d games ( like "Doom" ) with pygame only:
http://code.google.com/p/gh0stenstein/
and if you browse the pygame.org site you may find more "3d" games done with python and pygame.
However, if you really want to go into 3d programming you should look into OpenGl, Blender or any other real 3d lib.
Pygame was never originally meant to do 3d, but there is a way you can do 3d with any 2d graphics library. All you need is the following function, which converts 3d points to 2d points, which allows you to make any 3d shape by just drawing lines on a screen.
def convert_to_2d(point=[0,0,0]):
return [point[0]*(point[2]*.3),point[1]*(point[2]*.3)]
This is called pseudo 3d, or 2.5d. This can be done, but may be slow, and is extremely difficult to do, so it is suggested that you use a library meant for 3d.
It does not support, but combining with PyOpenGL you can make use of the power of both, here is a full example
import pygame
from pygame.locals import *
from OpenGL.GL import *
from OpenGL.GLU import *
import random
vertices = ((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 set_vertices(max_distance, min_distance = -20):
x_value_change = random.randrange(-10,10)
y_value_change = random.randrange(-10,10)
z_value_change = random.randrange(-1*max_distance,min_distance)
new_vertices = []
for vert in vertices:
new_vert = []
new_x = vert[0] + x_value_change
new_y = vert[1] + y_value_change
new_z = vert[2] + z_value_change
new_vert.append(new_x)
new_vert.append(new_y)
new_vert.append(new_z)
new_vertices.append(new_vert)
return new_vertices
def Cube(vertices):
glBegin(GL_QUADS)
for surface in surfaces:
x = 0
for vertex in surface:
x+=1
glColor3fv(colors[x])
glVertex3fv(vertices[vertex])
glEnd()
glBegin(GL_LINES)
for edge in edges:
for vertex in edge:
glVertex3fv(vertices[vertex])
glEnd()
def main():
pygame.init()
display = (800,600)
pygame.display.set_mode(display, DOUBLEBUF|OPENGL)
max_distance = 100
gluPerspective(45, (display[0]/display[1]), 0.1, max_distance)
glTranslatef(random.randrange(-5,5),random.randrange(-5,5), -40)
#object_passed = False
x_move = 0
y_move = 0
cube_dict = {}
for x in range(50):
cube_dict[x] =set_vertices(max_distance)
#glRotatef(25, 2, 1, 0)
x = glGetDoublev(GL_MODELVIEW_MATRIX)
camera_x = x[3][0]
camera_y = x[3][1]
camera_z = x[3][2]
button_down = False
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.MOUSEMOTION:
if button_down == True:
print(pygame.mouse.get_pressed())
glRotatef(event.rel[1], 1, 0, 0)
glRotatef(event.rel[0], 0, 1, 0)
for event in pygame.mouse.get_pressed():
# print(pygame.mouse.get_pressed())
if pygame.mouse.get_pressed()[0] == 1:
button_down = True
elif pygame.mouse.get_pressed()[0] == 0:
button_down = False
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT)
for each_cube in cube_dict:
Cube(cube_dict[each_cube])
pygame.display.flip()
pygame.time.wait(10)
main()
pygame.quit()
quit()
What you see as a 3D is actually a 2D game. After all, you are watching your screen, which (normally ;) ) is 2D. The virtual world (which is in 3D) is projected onto a plane, which is then shown on your screen. Our brains then convert that 2D image into a 3D one (like they do with the image of our eyes), making it look like it's 3D.
So it's relatively easy to make a 3D game: you just create a virtual world using a multidimensional matrix and then project it each loop on a 2D plane, which you display on your screen.
One tutorial that can put you on your way to 3D programs (using pygame) is this one .
3D rendering in Pygame without the help of other dependencies is hard to achieve and will not perform well. Pygame does not offer any functionality for drawing 3D shapes, meshes, or even perspective and lighting.
If you want to draw a 3D scene with Pygame, you need to compute the vertices using vector arithmetic and stitch the geometry together using polygons.
Example of then answer to Pygame rotating cubes around axis:
This approach won't give a satisfying performance and is only valuable for studying. 3D scenes are generated with the help of the GPU. A CPU-only approach does not achieve the required performance.
Nevertheless, nice results can be achieved with a 2.5-D approach. See the answer to How do I fix wall warping in my raycaster?:
import pygame
import math
pygame.init()
tile_size, map_size = 50, 8
board = [
'########',
'# # #',
'# # ##',
'# ## #',
'# #',
'### ###',
'# #',
'########']
def cast_rays(sx, sy, angle):
rx = math.cos(angle)
ry = math.sin(angle)
map_x = sx // tile_size
map_y = sy // tile_size
t_max_x = sx/tile_size - map_x
if rx > 0:
t_max_x = 1 - t_max_x
t_max_y = sy/tile_size - map_y
if ry > 0:
t_max_y = 1 - t_max_y
while True:
if ry == 0 or t_max_x < t_max_y * abs(rx / ry):
side = 'x'
map_x += 1 if rx > 0 else -1
t_max_x += 1
if map_x < 0 or map_x >= map_size:
break
else:
side = 'y'
map_y += 1 if ry > 0 else -1
t_max_y += 1
if map_x < 0 or map_y >= map_size:
break
if board[int(map_y)][int(map_x)] == "#":
break
if side == 'x':
x = (map_x + (1 if rx < 0 else 0)) * tile_size
y = player_y + (x - player_x) * ry / rx
direction = 'r' if x >= player_x else 'l'
else:
y = (map_y + (1 if ry < 0 else 0)) * tile_size
x = player_x + (y - player_y) * rx / ry
direction = 'd' if y >= player_y else 'u'
return (x, y), math.hypot(x - sx, y - sy), direction
def cast_fov(sx, sy, angle, fov, no_ofrays):
max_d = math.tan(math.radians(fov/2))
step = max_d * 2 / no_ofrays
rays = []
for i in range(no_ofrays):
d = -max_d + (i + 0.5) * step
ray_angle = math.atan2(d, 1)
pos, dist, direction = cast_rays(sx, sy, angle + ray_angle)
rays.append((pos, dist, dist * math.cos(ray_angle), direction))
return rays
area_width = tile_size * map_size
window = pygame.display.set_mode((area_width*2, area_width))
clock = pygame.time.Clock()
board_surf = pygame.Surface((area_width, area_width))
for row in range(8):
for col in range(8):
color = (192, 192, 192) if board[row][col] == '#' else (96, 96, 96)
pygame.draw.rect(board_surf, color, (col * tile_size, row * tile_size, tile_size - 2, tile_size - 2))
player_x, player_y = round(tile_size * 4.5) + 0.5, round(tile_size * 4.5) + 0.5
player_angle = 0
max_speed = 3
colors = {'r' : (196, 128, 64), 'l' : (128, 128, 64), 'd' : (128, 196, 64), 'u' : (64, 196, 64)}
run = True
while run:
clock.tick(30)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
keys = pygame.key.get_pressed()
hit_pos_front, dist_front, side_front = cast_rays(player_x, player_y, player_angle)
hit_pos_back, dist_back, side_back = cast_rays(player_x, player_y, player_angle + math.pi)
player_angle += (keys[pygame.K_RIGHT] - keys[pygame.K_LEFT]) * 0.1
speed = ((0 if dist_front <= max_speed else keys[pygame.K_UP]) - (0 if dist_back <= max_speed else keys[pygame.K_DOWN])) * max_speed
player_x += math.cos(player_angle) * speed
player_y += math.sin(player_angle) * speed
rays = cast_fov(player_x, player_y, player_angle, 60, 40)
window.blit(board_surf, (0, 0))
for ray in rays:
pygame.draw.line(window, (0, 255, 0), (player_x, player_y), ray[0])
pygame.draw.line(window, (255, 0, 0), (player_x, player_y), hit_pos_front)
pygame.draw.circle(window, (255, 0, 0), (player_x, player_y), 8)
pygame.draw.rect(window, (128, 128, 255), (400, 0, 400, 200))
pygame.draw.rect(window, (128, 128, 128), (400, 200, 400, 200))
for i, ray in enumerate(rays):
height = round(10000 / ray[2])
width = area_width // len(rays)
color = pygame.Color((0, 0, 0)).lerp(colors[ray[3]], min(height/256, 1))
rect = pygame.Rect(area_width + i*width, area_width//2-height//2, width, height)
pygame.draw.rect(window, color, rect)
pygame.display.flip()
pygame.quit()
exit()
Also see PyGameExamplesAndAnswers - Raycasting
I am aware that you asked "... but I was wondering if its possible to do very basic 3D graphics without any other dependencies.". Anyway, I will give you some additional options with other dependencies.
One way to make 3D scenes more powerful in Python is to use an OpenGL based library like pyglet or ModernGL.
However, you can use a Pygame window to create an OpenGL Context. You need to set the pygame.OPENGL flag when creating the display Surface (see pygame.display.set_mode):
window = pg.display.set_mode((width, height), pygame.OPENGL | pygame.DOUBLEBUF)
Modern OpenGL PyGame/PyOpenGL example:
import pygame
from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GL.shaders import *
import ctypes
import glm
glsl_vert = """
#version 330 core
layout (location = 0) in vec3 a_pos;
layout (location = 1) in vec4 a_col;
out vec4 v_color;
uniform mat4 u_proj;
uniform mat4 u_view;
uniform mat4 u_model;
void main()
{
v_color = a_col;
gl_Position = u_proj * u_view * u_model * vec4(a_pos.xyz, 1.0);
}
"""
glsl_frag = """
#version 330 core
out vec4 frag_color;
in vec4 v_color;
void main()
{
frag_color = v_color;
}
"""
class Cube:
def __init__(self):
v = [(-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), (1,2), (2,3), (3,0), (4,5), (5,6), (6,7), (7,4), (0,4), (1,5), (2,6), (3,7)]
surfaces = [(0,1,2,3), (5,4,7,6), (4,0,3,7),(1,5,6,2), (4,5,1,0), (3,2,6,7)]
colors = [(1,0,0), (0,1,0), (0,0,1), (1,1,0), (1,0,1), (1,0.5,0)]
line_color = [0, 0, 0]
edge_attributes = []
for e in edges:
edge_attributes += v[e[0]]
edge_attributes += line_color
edge_attributes += v[e[1]]
edge_attributes += line_color
face_attributes = []
for i, quad in enumerate(surfaces):
for iv in quad:
face_attributes += v[iv]
face_attributes += colors[i]
self.edge_vbo = glGenBuffers(1)
glBindBuffer(GL_ARRAY_BUFFER, self.edge_vbo)
glBufferData(GL_ARRAY_BUFFER, (GLfloat * len(edge_attributes))(*edge_attributes), GL_STATIC_DRAW)
self.edge_vao = glGenVertexArrays(1)
glBindVertexArray(self.edge_vao)
glVertexAttribPointer(0, 3, GL_FLOAT, False, 6*ctypes.sizeof(GLfloat), ctypes.c_void_p(0))
glEnableVertexAttribArray(0)
glVertexAttribPointer(1, 3, GL_FLOAT, False, 6*ctypes.sizeof(GLfloat), ctypes.c_void_p(3*ctypes.sizeof(GLfloat)))
glEnableVertexAttribArray(1)
self.face_vbos = glGenBuffers(1)
glBindBuffer(GL_ARRAY_BUFFER, self.face_vbos)
glBufferData(GL_ARRAY_BUFFER, (GLfloat * len(face_attributes))(*face_attributes), GL_STATIC_DRAW)
self.face_vao = glGenVertexArrays(1)
glBindVertexArray(self.face_vao)
glVertexAttribPointer(0, 3, GL_FLOAT, False, 6*ctypes.sizeof(GLfloat), ctypes.c_void_p(0))
glEnableVertexAttribArray(0)
glVertexAttribPointer(1, 3, GL_FLOAT, False, 6*ctypes.sizeof(GLfloat), ctypes.c_void_p(3*ctypes.sizeof(GLfloat)))
glEnableVertexAttribArray(1)
def draw(self):
glEnable(GL_DEPTH_TEST)
glLineWidth(5)
glBindVertexArray(self.edge_vao)
glDrawArrays(GL_LINES, 0, 12*2)
glBindVertexArray(0)
glEnable(GL_POLYGON_OFFSET_FILL)
glPolygonOffset( 1.0, 1.0 )
glBindVertexArray(self.face_vao)
glDrawArrays(GL_QUADS, 0, 6*4)
glBindVertexArray(0)
glDisable(GL_POLYGON_OFFSET_FILL)
def set_projection(w, h):
return glm.perspective(glm.radians(45), w / h, 0.1, 50.0)
pygame.init()
window = pygame.display.set_mode((400, 300), pygame.DOUBLEBUF | pygame.OPENGL | pygame.RESIZABLE)
clock = pygame.time.Clock()
proj = set_projection(*window.get_size())
view = glm.lookAt(glm.vec3(0, 0, 5), glm.vec3(0, 0, 0), glm.vec3(0, 1, 0))
model = glm.mat4(1)
cube = Cube()
angle_x, angle_y = 0, 0
program = compileProgram(
compileShader(glsl_vert, GL_VERTEX_SHADER),
compileShader(glsl_frag, GL_FRAGMENT_SHADER))
attrib = { a : glGetAttribLocation(program, a) for a in ['a_pos', 'a_col'] }
print(attrib)
uniform = { u : glGetUniformLocation(program, u) for u in ['u_model', 'u_view', 'u_proj'] }
print(uniform)
glUseProgram(program)
run = True
while run:
clock.tick(60)
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
elif event.type == pygame.VIDEORESIZE:
glViewport(0, 0, event.w, event.h)
proj = set_projection(event.w, event.h)
model = glm.mat4(1)
model = glm.rotate(model, glm.radians(angle_y), glm.vec3(0, 1, 0))
model = glm.rotate(model, glm.radians(angle_x), glm.vec3(1, 0, 0))
glUniformMatrix4fv(uniform['u_proj'], 1, GL_FALSE, glm.value_ptr(proj))
glUniformMatrix4fv(uniform['u_view'], 1, GL_FALSE, glm.value_ptr(view))
glUniformMatrix4fv(uniform['u_model'], 1, GL_FALSE, glm.value_ptr(model))
angle_x += 1
angle_y += 0.4
glClearColor(0.5, 0.5, 0.5, 1)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
cube.draw()
pygame.display.flip()
pygame.quit()
exit()
Legacy OpenGL PyGame/PyOpenGL example:
import pygame
from OpenGL.GL import *
from OpenGL.GLU import *
class Cube:
def __init__(self):
self.v = [(-1,-1,-1), ( 1,-1,-1), ( 1, 1,-1), (-1, 1,-1), (-1,-1, 1), ( 1,-1, 1), ( 1, 1, 1), (-1, 1, 1)]
self.edges = [(0,1), (1,2), (2,3), (3,0), (4,5), (5,6), (6,7), (7,4), (0,4), (1,5), (2,6), (3,7)]
self.surfaces = [(0,1,2,3), (5,4,7,6), (4,0,3,7),(1,5,6,2), (4,5,1,0), (3,2,6,7)]
self.colors = [(1,0,0), (0,1,0), (0,0,1), (1,1,0), (1,0,1), (1,0.5,0)]
def draw(self):
glEnable(GL_DEPTH_TEST)
glLineWidth(5)
glColor3fv((0, 0, 0))
glBegin(GL_LINES)
for e in self.edges:
glVertex3fv(self.v[e[0]])
glVertex3fv(self.v[e[1]])
glEnd()
glEnable(GL_POLYGON_OFFSET_FILL)
glPolygonOffset( 1.0, 1.0 )
glBegin(GL_QUADS)
for i, quad in enumerate(self.surfaces):
glColor3fv(self.colors[i])
for iv in quad:
glVertex3fv(self.v[iv])
glEnd()
glDisable(GL_POLYGON_OFFSET_FILL)
def set_projection(w, h):
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
gluPerspective(45, w / h, 0.1, 50.0)
glMatrixMode(GL_MODELVIEW)
def screenshot(display_surface, filename):
size = display_surface.get_size()
buffer = glReadPixels(0, 0, *size, GL_RGBA, GL_UNSIGNED_BYTE)
screen_surf = pygame.image.fromstring(buffer, size, "RGBA")
pygame.image.save(screen_surf, filename)
pygame.init()
window = pygame.display.set_mode((400, 300), pygame.DOUBLEBUF | pygame.OPENGL | pygame.RESIZABLE)
clock = pygame.time.Clock()
set_projection(*window.get_size())
cube = Cube()
angle_x, angle_y = 0, 0
run = True
while run:
clock.tick(60)
take_screenshot = False
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
elif event.type == pygame.VIDEORESIZE:
glViewport(0, 0, event.w, event.h)
set_projection(event.w, event.h)
elif event.type == pygame.KEYDOWN:
take_screenshot = True
glLoadIdentity()
glTranslatef(0, 0, -5)
glRotatef(angle_y, 0, 1, 0)
glRotatef(angle_x, 1, 0, 0)
angle_x += 1
angle_y += 0.4
glClearColor(0.5, 0.5, 0.5, 1)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
cube.draw()
if take_screenshot:
screenshot(window, "cube.png")
pygame.display.flip()
pygame.quit()
exit()
You can make like this :
def convert_2d(x, y, z, horizon):
d = 1 - (z/horizon)
return x*d, y*d
def draw_list_of_points(lst):
'''Assume that lst is a list of 3 dimentionnal points like [(0, 0, 0), (1, 6, 2)...
Let's take 200 for the horizon, it can give us a pretty clean 3D'''
for x, y, z in lst:
pygame.draw.circle(screen, color, convert_2d(x, y, z, 200), 1)
But it's not very fast. If you want fast try to implement in C++/SDL2 or C.
Pygame is not very good for 3d graphics.
It is easy to make 3D driver for PyGame. PyGame has some assets for 3D game development.
I am developing Py3D driver using PyGame now. When I finish, I'll show you link to download Py3D. I tried to make 3D game with PyGame, and I needed just small addon for PyGame. It is wrong you think you must use SDL, PyOpenGL, OpenGL, PyQt5, Tkinter. All of them are wrong for making 3D games. OpenGL and PyOpenGL or Panda3D are very hard to learn. All my games made on those drivers were awful. PyQt5 and Tkinter aren't drivers for making games, but they've got addons for it. Don't try to make any game on those drivers. All drivers where we need to use the math module are hard. You can easily make small addon for them, I think everybody can make driver for PyGame in 1-2 weeks.
If you want to stick with a python-esque language when making games, Godot is a good alternative with both 2D and 3D support, a large community, and lots of tutorials. Its custom scripting language(gdscript) has some minor differences, but overall its mostly the same. It also has support for c# and c++, and has much more features when it comes to game development.
Pygame is just a library for changing the color of pixels (and some other useful stuff for programming games). You can do this by blitting images to the screen or directly setting the colors of pixels.
Because of this, it is easy to write 2D games with pygame, as the above is all you really need. But a 3D game is just some 3D objects 'squashed' (rendered) into 2D so that it can be displayed on the screen. So, to make a 3D game using only pygame, you would have handle this rendering by yourself, including all the complex matrix maths necessary.
Not only would this run slowly because of the immense processing power involved in this, but it would require you to write a massive 3D rendering/rasterisation engine. And because of python being interpreted it would be even slower. The correct approach would be to have this process run on the GPU using (Py)opengl.
So, yes it is technically possible to do 3D using only pygame, but definitely not recommended. I would suggest you learn Panda3D or some similar 3D engine.
Simple:
Just draw a bunch of polygons like:
import pygame
screen = pygame.display.set_mode((100, 100))
While True:
screen.fill((0, 0, 0))
Pos = [(10, 10), (20, 10), (20, 20), (10, 20)]
# first side (the front) in red
pygame.draw.polygon(screen, (225, 0, 0), Pos)
# outline in white
pygame.draw.lines(screen, (225, 225, 225), Pos)
# Second side (the back) in blue
Pos2 = [(Pos[0[0]] + 2.5, Pos[0[1]] + 2.5), (Pos2[0[0]] + 5, Pos2[0[1]]), (Pos2[1[0]], Pos2[1[1]] + 5), (Pos2[0[0]], Pos2[0[1]] + 5)]
pygame.draw.polygon(screen, (0, 0, 225), Pos2)
pygame.draw.lines(screen, (225, 225, 225), Pos2)
# Third side (the left but just 2 lines(not really)) in green
Pos3 = [Pos[0], Pos2[0], Pos2[3], Pos[3]]
pygame.draw.polygon(screen, (0, 225, 0), Pos3)
pygame.draw.lines(screen, (225, 225, 225), Pos3)
# Fourth side (the right) in purple
Pos4 = [Pos[1], Pos2[1], Pos2[2], Pos[2]]
pygame.draw.polygon(screen, (225, 0, 225), Pos4)
pygame.draw.lines(screen, (225, 225, 225), Pos4)
pygame.display.flip()
& there is a simple cube & I will soon provide a link for the full code to be able to rotate the cube & resize it
This should give you an equivalent of what you would get by using OpenGL
This is what I have managed to do with just Pygame and Numpy without using OpenGL with some basic shading.
You can do 3D in PyGame but probably isn't the most efficient and fastest.