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Main.py
182 lines (146 loc) · 5.75 KB
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Main.py
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from TGAImage import TGAImage, Format
from Color import Color
from Model import Model
from Vector import Vector
from random import randint
from math import fabs
import sys
red = Color(255, 0, 0, 255)
green = Color(0, 255, 0, 255)
blue = Color(0, 0, 255, 255)
white = Color(255, 255, 255, 255)
width = 700
height = 700
depth = 255
light_intensity_vector = Vector(0, 0, 1.0)
def main():
model = Model("obj/african_head.obj")
image = TGAImage(width, height, Format.RGB)
# model.write("info.txt")
zbuffer = []
for i in range(0, image.width * image.height):
zbuffer.append(-sys.maxint - 1)
for i in range(0, len(model.faces)):
screen_coord = [Vector(), Vector(), Vector()]
world_coords = [Vector(), Vector(), Vector()]
for j in range(0, 3):
world_coord_vector = model.get_vert(i, j)
screen_coord[j].x = int((world_coord_vector.x + 1.) * width / 2)
screen_coord[j].y = int((world_coord_vector.y + 1.) * height / 2)
screen_coord[j].z = int((world_coord_vector.z + 1.) * depth / 2)
world_coords[j] = world_coord_vector
# n = (world_coords[2] - world_coords[0]) ^ (world_coords[1] - world_coords[0])
# norm = n.normalize()
# intensity = norm.mul(light_intensity_vector)
# if intensity < 0: # skip invisible triangle
# continue
uv = [Vector(), Vector(), Vector()]
for k in range(0, 3):
uv[k] = model.get_uv(i, k)
norms = [Vector(), Vector(), Vector()]
for k in range(0, 3):
norms[k] = model.get_norm(i, k)
# random_color = Color(randint(0, 255), randint(0, 255), randint(0, 255), 255)
# color = Color(int(intensity * 255), int(intensity * 255), int(intensity * 255), 255)
triangle(screen_coord[0], screen_coord[1], screen_coord[2], uv[0], uv[1], uv[2], norms[0], norms[1], norms[2], image, zbuffer, model)
image.write("output.tga")
# scene = TGAImage(width + 1, height + 1, Format.RGBA)
# line_by_vector(Vector(20, 34), Vector(644, 400), scene, red)
# line_by_vector(Vector(120, 434), Vector(444, 400), scene, green)
# line_by_vector(Vector(330, 463), Vector(594, 200), scene, blue)
#
# line_by_vector(Vector(10, 10), Vector(690, 10), scene, white)
#
# scene.write("scene.tga")
#
# render = TGAImage(width, 16, Format.RGBA)
# buffer = []
# for i in range(0, width):
# buffer.append(-sys.maxint - 1)
#
# rasterise(Vector(20, 34), Vector(644, 400), render, red, buffer)
# rasterise(Vector(120, 434), Vector(444, 400), render, green, buffer)
# rasterise(Vector(330, 463), Vector(594, 200), render, blue, buffer)
#
# render.write("render.tga")
def rasterise(point_vect0, point_vect1, image, color, ybuffer):
p0 = point_vect0
p1 = point_vect1
if p0.x > p1.x:
p0, p1 = p1, p0
deltaX = float(p1.x - p0.x)
for x in range(p0.x, p1.x, 1):
t = (x - p0.x) / deltaX
y = p0.y * (1 - t) + p1.y * t
if ybuffer[x] < y:
ybuffer[x] = y
for i in range(0, image.height):
image.set(x, i, color)
def triangle(v0, v1, v2, uv0, uv1, uv2, n0, n1, n2, image, zbuffer, model):
# line_by_vector(v1, v2, image, red)
# line_by_vector(v1, v3, image, red)
# line_by_vector(v2, v3, image, red)
if v0.y > v1.y:
v0, v1 = v1, v0
uv0, uv1 = uv1, uv0
n0, n1 = n1, n0
if v0.y > v2.y:
v0, v2 = v2, v0
uv0, uv2 = uv2, uv0
n0, n2 = n2, n0
if v1.y > v2.y:
v1, v2 = v2, v1
uv1, uv2 = uv2, uv1
n1, n2 = n2, n1
total_height = int(v2.y - v0.y)
for y in range(0, total_height):
is_second_half = y > v1.y - v0.y or v1.y == v0.y
segment_height = v2.y - v1.y if is_second_half else v1.y - v0.y
alpha = float(y) / total_height
delta = (v1.y - v0.y) if is_second_half else 0
beta = float(y - delta) / segment_height
a = v0 + (v2 - v0) * alpha
b = v1 + (v2 - v1) * beta if is_second_half else v0 + (v1 - v0) * beta
uvA = uv0 + (uv2 - uv0) * alpha
uvB = uv1 + (uv2 - uv1) * beta if is_second_half else uv0 + (uv1 - uv0)*beta
nA = n0 + (n2 - n0) * alpha
nB = n1 + (n2 - n1) * beta if is_second_half else n0 + (n1 - n0) * beta
if a.x > b.x:
a, b = b, a
uvA, uvB = uvB, uvA
nA, nB = nB, nA
for i in range(int(a.x), int(b.x)):
phi = 1. if a.x == b.x else float((i - a.x) / float(b.x - a.x))
p = a + (b - a) * phi
uvP = uvA + (uvB - uvA) * phi
nP = nA + (nB - nA) * phi
idx = int(p.x + p.y * image.width)
if zbuffer[idx] < p.z:
zbuffer[idx] = p.z
color = model.diffuse(uvP)
intensity = nP.mul(light_intensity_vector)
if intensity < 0: # skip invisible triangle
continue
color_intensity = Color(int(color.r() * intensity), int(color.g() * intensity), int(color.b() * intensity))
image.set(int(p.x), int(p.y), color_intensity)
def line_by_vector(v1, v2, image, color):
line(v1.x, v1.y, v2.x, v2.y, image, color)
def line(x0, y0, x1, y1, image, color):
steep = None
if abs(x1 - x0) < abs(y1 - y0):
y0, x0 = x0, y0
y1, x1 = x1, y1
steep = True
if x0 > x1:
x0, x1 = x1, x0
y0, y1 = y1, y0
for x in range(x0, x1, 1):
t = (x - x0) / float(x1 - x0)
y = y0 * (1 - t) + y1 * t
if steep:
image.set(int(y), int(x), color)
else:
image.set(int(x), int(y), color)
# This is the standard boilerplate that calls the main() function.
if __name__ == '__main__':
main()