/usr/share/kivy-examples/3Drendering/objloader.py is in python-kivy-examples 1.8.0+dfsg-2.1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | class MeshData(object):
def __init__(self, **kwargs):
self.name = kwargs.get("name")
self.vertex_format = [
('v_pos', 3, 'float'),
('v_normal', 3, 'float'),
('v_tc0', 2, 'float')]
self.vertices = []
self.indices = []
def calculate_normals(self):
for i in range(len(self.indices) / (3)):
fi = i * 3
v1i = self.indices[fi]
v2i = self.indices[fi + 1]
v3i = self.indices[fi + 2]
vs = self.vertices
p1 = [vs[v1i + c] for c in range(3)]
p2 = [vs[v2i + c] for c in range(3)]
p3 = [vs[v3i + c] for c in range(3)]
u,v = [0,0,0], [0,0,0]
for j in range(3):
v[j] = p2[j] - p1[j]
u[j] = p3[j] - p1[j]
n = [0,0,0]
n[0] = u[1] * v[2] - u[2] * v[1]
n[1] = u[2] * v[0] - u[0] * v[2]
n[2] = u[0] * v[1] - u[1] * v[0]
for k in range(3):
self.vertices[v1i + 3 + k] = n[k]
self.vertices[v2i + 3 + k] = n[k]
self.vertices[v3i + 3 + k] = n[k]
class ObjFile:
def finish_object(self):
if self._current_object == None:
return
mesh = MeshData()
idx = 0
for f in self.faces:
verts = f[0]
norms = f[1]
tcs = f[2]
for i in range(3):
#get normal components
n = (0.0, 0.0, 0.0)
if norms[i] != -1:
n = self.normals[norms[i]-1]
#get texture coordinate components
t = (0.0, 0.0)
if tcs[i] != -1:
t = self.texcoords[tcs[i]-1]
#get vertex components
v = self.vertices[verts[i]-1]
data = [v[0], v[1], v[2], n[0], n[1], n[2], t[0], t[1]]
mesh.vertices.extend(data)
tri = [idx, idx+1, idx+2]
mesh.indices.extend(tri)
idx += 3
self.objects[self._current_object] = mesh
#mesh.calculate_normals()
self.faces = []
def __init__(self, filename, swapyz=False):
"""Loads a Wavefront OBJ file. """
self.objects = {}
self.vertices = []
self.normals = []
self.texcoords = []
self.faces = []
self._current_object = None
material = None
for line in open(filename, "r"):
if line.startswith('#'): continue
if line.startswith('s'): continue
values = line.split()
if not values: continue
if values[0] == 'o':
self.finish_object()
self._current_object = values[1]
#elif values[0] == 'mtllib':
# self.mtl = MTL(values[1])
#elif values[0] in ('usemtl', 'usemat'):
# material = values[1]
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] == '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(-1)
if len(w) >= 3 and len(w[2]) > 0:
norms.append(int(w[2]))
else:
norms.append(-1)
self.faces.append((face, norms, texcoords, material))
self.finish_object()
def MTL(filename):
contents = {}
mtl = None
return
for line in open(filename, "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")
mtl[values[0]] = values[1:]
return contents
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