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objloader.py
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objloader.py
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import pygame
from OpenGL.GL import *
class Line(object):
def __init__(self, _min, _max):
self.min = _min
self.max = _max
def __add__(self, n):
return Line(self.min + n, self.max + n)
def intersects(self, line):
return (self.min < line.max and self.min > line.min) or (self.max < line.max and self.max > line.min)
class Cube(object):
def __init__(self, vertices):
point_lists = [[], [], []]
for vertex in vertices:
for i, n in enumerate(vertex):
point_lists[i].append(n)
self.x_line = self._line(point_lists[0])
self.y_line = self._line(point_lists[1])
self.z_line = self._line(point_lists[2])
def _line(self, point_list):
return Line(min(point_list), max(point_list))
def _vec(self, obj):
return [self.x_line + obj.x, self.y_line + obj.y, self.z_line + obj.z]
def intersects(self, obj, target_cube, target_obj):
lines = self._vec(obj)
target_lines = target_cube._vec(target_obj)
print [s.intersects(t) for s, t in zip(lines, target_lines)]
return all([s.intersects(t) for s, t in zip(lines, target_lines)])
def MTL(filename):
contents = {}
mtl = None
path = 'data/' + filename
for line in open(path, 'r'):
if line.startswith('#'): continue
values = line.split()
if not values: continue
if values[0] == 'newmtl':
mtl = contents[values[1]] = {}
elif mtl is None:
raise ValueError, "mtl file doesn't start with newmtl stmt"
elif values[0] == 'map_Kd':
mtl[values[0]] = values[1]
surf = pygame.image.load('data/' + mtl['map_Kd'])
image = pygame.image.tostring(surf, 'RGBA', 1)
ix, iy = surf.get_rect().size
texid = mtl['texture_Kd'] = glGenTextures(1)
glBindTexture(GL_TEXTURE_2D, texid)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
GL_LINEAR)
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, ix, iy, 0, GL_RGBA,
GL_UNSIGNED_BYTE, image)
else:
mtl[values[0]] = map(float, values[1:])
return contents
class OBJ:
def __init__(self, filename, swapyz=False):
self.vertices = []
self.normals = []
self.texcoords = []
self.faces = []
material = None
path = 'data/' + filename
for line in open(path, "r"):
if line.startswith('#'): continue
values = line.split()
if not values: continue
if values[0] == 'v':
v = map(float, values[1:4])
if swapyz:
v = v[0], v[2], v[1]
self.vertices.append(v)
elif values[0] == 'vn':
v = map(float, values[1:4])
if swapyz:
v = v[0], v[2], v[1]
self.normals.append(v)
elif values[0] == 'vt':
self.texcoords.append(map(float, values[1:3]))
elif values[0] in ('usemtl', 'usemat'):
material = values[1]
elif values[0] == 'mtllib':
self.mtl = MTL(values[1])
elif values[0] == 'f':
face = []
texcoords = []
norms = []
for v in values[1:]:
w = v.split('/')
face.append(int(w[0]))
if len(w) >= 2 and len(w[1]) > 0:
texcoords.append(int(w[1]))
else:
texcoords.append(0)
if len(w) >= 3 and len(w[2]) > 0:
norms.append(int(w[2]))
else:
norms.append(0)
self.faces.append((face, norms, texcoords, material))
self.cube = Cube(self.vertices)
self.gl_list = glGenLists(1)
glNewList(self.gl_list, GL_COMPILE)
glEnable(GL_TEXTURE_2D)
glFrontFace(GL_CCW)
for face in self.faces:
vertices, normals, texture_coords, material = face
mtl = self.mtl[material]
if 'texture_Kd' in mtl:
glBindTexture(GL_TEXTURE_2D, mtl['texture_Kd'])
else:
glColor(*mtl['Kd'])
glBegin(GL_POLYGON)
for i in range(len(vertices)):
if normals[i] > 0:
glNormal3fv(self.normals[normals[i] - 1])
if texture_coords[i] > 0:
glTexCoord2fv(self.texcoords[texture_coords[i] - 1])
glVertex3fv(self.vertices[vertices[i] - 1])
glEnd()
glDisable(GL_TEXTURE_2D)
glEndList()