/
main.py
150 lines (96 loc) · 3.49 KB
/
main.py
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from bmp_image import *
from model import load_obj
import numpy as np
w, h = 500, 500
zbuffer = [-float('infinity')]*(w*h)
def line(img, x0, y0, x1, y1, color):
steep = False
if abs(x0 - x1) < abs(y0 - y1):
x0, y0 = y0, x0
x1, y1 = y1, x1
steep = True
if x0 > x1:
x0, x1 = x1, x0
y0, y1 = y1, y0
# noinspection PyUnresolvedReferences
dx = x1 - x0
# noinspection PyUnresolvedReferences
dy = y1 - y0
derror = abs(dy) * 2
error = 0
y = y0
for x in range(x0, x1):
if steep:
point(img, y, x, color)
else:
point(img, x, y, color)
error += derror
if error > dx:
y += 1 if y1 > y0 else -1
error -= dx * 2
# noinspection PyUnresolvedReferences
def triangle(img, p0, p1, p2, color):
if p0[1] == p1[1] and p0[1] == p2[1]:
return None
if p0[1] > p1[1]:
p0, p1 = p1, p0
if p0[1] > p2[1]:
p0, p2 = p2, p0
if p1[1] > p2[1]:
p1, p2 = p2, p1
total_height = p2[1] - p0[1]
for i in range(round(total_height)):
second_half = i > p1[1] - p0[1] or p1[1] == p0[1]
segment_height = p2[1] - p1[1] if second_half else p1[1] - p0[1]
alpha = i / total_height
beta = (i - (p1[1] - p0[1] if second_half else 0)) / segment_height
a = [p0[0] + (p2[0] - p0[0]) * alpha, p0[1] + (p2[1] - p0[1]) * alpha, p0[2] + (p2[2] - p0[2]) * alpha]
b = [p1[0] + (p2[0] - p1[0]) * beta, p1[1] + (p2[1] - p1[1]) * beta, p1[2] + (p2[2] - p1[2]) * beta]\
if second_half else \
[p0[0] + (p1[0] - p0[0]) * beta, p0[1] + (p1[1] - p0[1]) * beta, p0[2] + (p1[2] - p0[2]) * beta]
if a[0] > b[0]:
a, b = b, a
for j in range(round(a[0]), round(b[0])):
phi = 1. if b[0] == a[0] else (j-a[0])/(b[0]-a[0])
p = [a[0] + (b[0] - a[0]) * phi, b[1] + (b[1] - a[1]) * phi, a[2] + (b[2] - a[2]) * phi]
idx = int(p[0]+p[1]*w)
if zbuffer[idx]<p[2]:
zbuffer[idx] = p[2]
p[0] = j
p[1] = p0[1] + i
point(img, p[0], p[1], color)
def cross(v1, v2, v3):
ab = v1 - v2
bc = v2 - v3
return norm([ab[1] * bc[2] - ab[2] * bc[1], ab[2] * bc[0] - ab[0] * bc[2], ab[0] * bc[1] - ab[1] * bc[0]])
def dot(a, b):
return a[0] * b[0] + a[1] * b[1] + a[2] * b[2]
def norm(v):
s = (v[0] ** 2 + v[1] ** 2 + v[2] ** 2) ** 0.5
return np.array([v[0] / s, v[1] / s, v[2] / s])
def get_light(n):
return min(max(dot(n, norm([0, 0, 1])), 0), 1)
zb_image = new_image(100, 16)
z_image = new_image(100, 16)
image = new_image(w, h)
model = load_obj('object.obj')
print('draw model')
for face in model[1]:
points = []
n = cross(np.array(model[0][face[0]]), np.array(model[0][face[1]]), np.array(model[0][face[2]]))
l = get_light(n)
if l > 0:
for i in face:
vert = model[0][i]
points.append([(vert[0]+1)*w/2, (vert[1]+1)*h/2, (vert[2]+1)*255/2])
triangle(image, points[0], points[1], points[2], (255*l, 255*l, 255*l))
print('draw zbuffer')
for i in range(len(zbuffer)):
id = i
x = id % w
y = id / h
c = min(abs(zbuffer[i]), 255)
print(i)
point(zb_image, x, y, (c, c, c))
save_image(image, 'output.bmp')
save_image(zb_image, 'zbuffer.bmp')