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convert.py
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convert.py
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"""Convert Wavefront OBJ / MTL files into Three.js (JSON model version, to be used with ascii / binary loader)
-------------------------
How to use this converter
-------------------------
python convert_obj_three.py -i infile.obj -o outfile.js [-m "morphfiles*.obj"] [-c "morphcolors*.obj"] [-a center|centerxz|top|bottom|none] [-s smooth|flat] [-t ascii|binary] [-d invert|normal] [-b] [-e]
Notes:
- flags
-i infile.obj input OBJ file
-o outfile.js output JS file
-m "morphfiles*.obj" morph OBJ files (can use wildcards, enclosed in quotes multiple patterns separate by space)
-c "morphcolors*.obj" morph colors OBJ files (can use wildcards, enclosed in quotes multiple patterns separate by space)
-a center|centerxz|top|bottom|none model alignment
-s smooth|flat smooth = export vertex normals, flat = no normals (face normals computed in loader)
-t ascii|binary export ascii or binary format (ascii has more features, binary just supports vertices, faces, normals, uvs and materials)
-d invert|normal invert transparency
-b bake material colors into face colors
-x 10.0 scale and truncate
-f 2 morph frame sampling step
- by default:
use smooth shading (if there were vertex normals in the original model)
will be in ASCII format
original model is assumed to use non-inverted transparency / dissolve (0.0 fully transparent, 1.0 fully opaque)
no face colors baking
no scale and truncate
morph frame step = 1 (all files will be processed)
- binary conversion will create two files:
outfile.js (materials)
outfile.bin (binary buffers)
--------------------------------------------------
How to use generated JS file in your HTML document
--------------------------------------------------
<script type="text/javascript" src="Three.js"></script>
...
<script type="text/javascript">
...
// load ascii model
var jsonLoader = new THREE.JSONLoader();
jsonLoader.load( "Model_ascii.js", createScene );
// load binary model
var binLoader = new THREE.BinaryLoader();
binLoader.load( "Model_bin.js", createScene );
function createScene( geometry, materials ) {
var mesh = new THREE.Mesh( geometry, new THREE.MeshFaceMaterial( materials ) );
}
...
</script>
-------------------------------------
Parsers based on formats descriptions
-------------------------------------
http://en.wikipedia.org/wiki/Obj
http://en.wikipedia.org/wiki/Material_Template_Library
-------------------
Current limitations
-------------------
- for the moment, only diffuse color and texture are used
(will need to extend shaders / renderers / materials in Three)
- texture coordinates can be wrong in canvas renderer
(there is crude normalization, but it doesn't
work for all cases)
- smoothing can be turned on/off only for the whole mesh
----------------------------------------------
How to get proper OBJ + MTL files with Blender
----------------------------------------------
0. Remove default cube (press DEL and ENTER)
1. Import / create model
2. Select all meshes (Select -> Select All by Type -> Mesh)
3. Export to OBJ (File -> Export -> Wavefront .obj)
- enable following options in exporter
Material Groups
Rotate X90
Apply Modifiers
High Quality Normals
Copy Images
Selection Only
Objects as OBJ Objects
UVs
Normals
Materials
- select empty folder
- give your exported file name with "obj" extension
- click on "Export OBJ" button
4. Your model is now all files in this folder (OBJ, MTL, number of images)
- this converter assumes all files staying in the same folder,
(OBJ / MTL files use relative paths)
- for WebGL, textures must be power of 2 sized
------
Author
------
AlteredQualia http://alteredqualia.com
"""
import fileinput
import operator
import random
import os.path
import getopt
import sys
import struct
import math
import glob
# #####################################################
# Configuration
# #####################################################
ALIGN = "none" # center centerxz bottom top none
SHADING = "smooth" # smooth flat
TYPE = "ascii" # ascii binary
TRANSPARENCY = "normal" # normal invert
TRUNCATE = False
SCALE = 1.0
FRAMESTEP = 1
BAKE_COLORS = False
# default colors for debugging (each material gets one distinct color):
# white, red, green, blue, yellow, cyan, magenta
COLORS = [0xeeeeee, 0xee0000, 0x00ee00, 0x0000ee, 0xeeee00, 0x00eeee, 0xee00ee]
# #####################################################
# Templates
# #####################################################
TEMPLATE_FILE_ASCII = u"""\
{
"metadata" :
{
"formatVersion" : 3.1,
"sourceFile" : "%(fname)s",
"generatedBy" : "OBJConverter",
"vertices" : %(nvertex)d,
"faces" : %(nface)d,
"normals" : %(nnormal)d,
"colors" : %(ncolor)d,
"uvs" : %(nuv)d,
"materials" : %(nmaterial)d
},
"scale" : %(scale)f,
"materials": [%(materials)s],
"vertices": [%(vertices)s],
"morphTargets": [%(morphTargets)s],
"morphColors": [%(morphColors)s],
"normals": [%(normals)s],
"colors": [%(colors)s],
"uvs": [[%(uvs)s]],
"faces": [%(faces)s]
}
"""
TEMPLATE_FILE_BIN = u"""\
{
"metadata" :
{
"formatVersion" : 3.1,
"sourceFile" : "%(fname)s",
"generatedBy" : "OBJConverter",
"vertices" : %(nvertex)d,
"faces" : %(nface)d,
"normals" : %(nnormal)d,
"uvs" : %(nuv)d,
"materials" : %(nmaterial)d
},
"materials": [%(materials)s],
"buffers": "%(buffers)s"
}
"""
TEMPLATE_VERTEX = "%f,%f,%f"
TEMPLATE_VERTEX_TRUNCATE = "%d,%d,%d"
TEMPLATE_N = "%.5g,%.5g,%.5g"
TEMPLATE_UV = "%.5g,%.5g"
TEMPLATE_COLOR = "%.3g,%.3g,%.3g"
TEMPLATE_COLOR_DEC = "%d"
TEMPLATE_MORPH_VERTICES = '\t{ "name": "%s", "vertices": [%s] }'
TEMPLATE_MORPH_COLORS = '\t{ "name": "%s", "colors": [%s] }'
# #####################################################
# Utils
# #####################################################
def file_exists(filename):
"""Return true if file exists and is accessible for reading.
Should be safer than just testing for existence due to links and
permissions magic on Unix filesystems.
@rtype: boolean
"""
try:
f = open(filename, 'r')
f.close()
return True
except IOError:
return False
def get_name(fname):
"""Create model name based of filename ("path/fname.js" -> "fname").
"""
return os.path.splitext(os.path.basename(fname))[0]
def bbox(vertices):
"""Compute bounding box of vertex array.
"""
if len(vertices)>0:
minx = maxx = vertices[0][0]
miny = maxy = vertices[0][1]
minz = maxz = vertices[0][2]
for v in vertices[1:]:
if v[0]<minx:
minx = v[0]
elif v[0]>maxx:
maxx = v[0]
if v[1]<miny:
miny = v[1]
elif v[1]>maxy:
maxy = v[1]
if v[2]<minz:
minz = v[2]
elif v[2]>maxz:
maxz = v[2]
return { 'x':[minx,maxx], 'y':[miny,maxy], 'z':[minz,maxz] }
else:
return { 'x':[0,0], 'y':[0,0], 'z':[0,0] }
def translate(vertices, t):
"""Translate array of vertices by vector t.
"""
for i in xrange(len(vertices)):
vertices[i][0] += t[0]
vertices[i][1] += t[1]
vertices[i][2] += t[2]
def center(vertices):
"""Center model (middle of bounding box).
"""
bb = bbox(vertices)
cx = bb['x'][0] + (bb['x'][1] - bb['x'][0])/2.0
cy = bb['y'][0] + (bb['y'][1] - bb['y'][0])/2.0
cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
translate(vertices, [-cx,-cy,-cz])
def top(vertices):
"""Align top of the model with the floor (Y-axis) and center it around X and Z.
"""
bb = bbox(vertices)
cx = bb['x'][0] + (bb['x'][1] - bb['x'][0])/2.0
cy = bb['y'][1]
cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
translate(vertices, [-cx,-cy,-cz])
def bottom(vertices):
"""Align bottom of the model with the floor (Y-axis) and center it around X and Z.
"""
bb = bbox(vertices)
cx = bb['x'][0] + (bb['x'][1] - bb['x'][0])/2.0
cy = bb['y'][0]
cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
translate(vertices, [-cx,-cy,-cz])
def centerxz(vertices):
"""Center model around X and Z.
"""
bb = bbox(vertices)
cx = bb['x'][0] + (bb['x'][1] - bb['x'][0])/2.0
cy = 0
cz = bb['z'][0] + (bb['z'][1] - bb['z'][0])/2.0
translate(vertices, [-cx,-cy,-cz])
def normalize(v):
"""Normalize 3d vector"""
l = math.sqrt(v[0]*v[0] + v[1]*v[1] + v[2]*v[2])
if l:
v[0] /= l
v[1] /= l
v[2] /= l
def veckey3(v):
return round(v[0], 6), round(v[1], 6), round(v[2], 6)
# #####################################################
# MTL parser
# #####################################################
def texture_relative_path(fullpath):
texture_file = os.path.basename(fullpath.replace("\\", "/"))
return texture_file
def parse_mtl(fname):
"""Parse MTL file.
"""
materials = {}
for line in fileinput.input(fname):
chunks = line.split()
if len(chunks) > 0:
# Material start
# newmtl identifier
if chunks[0] == "newmtl":
if len(chunks) > 1:
identifier = chunks[1]
else:
identifier = ""
if not identifier in materials:
materials[identifier] = {}
# Diffuse color
# Kd 1.000 1.000 1.000
if chunks[0] == "Kd" and len(chunks) == 4:
materials[identifier]["colorDiffuse"] = [float(chunks[1]), float(chunks[2]), float(chunks[3])]
# Ambient color
# Ka 1.000 1.000 1.000
if chunks[0] == "Ka" and len(chunks) == 4:
materials[identifier]["colorAmbient"] = [float(chunks[1]), float(chunks[2]), float(chunks[3])]
# Specular color
# Ks 1.000 1.000 1.000
if chunks[0] == "Ks" and len(chunks) == 4:
materials[identifier]["colorSpecular"] = [float(chunks[1]), float(chunks[2]), float(chunks[3])]
# Specular coefficient
# Ns 154.000
if chunks[0] == "Ns" and len(chunks) == 2:
materials[identifier]["specularCoef"] = float(chunks[1])
# Transparency
# Tr 0.9 or d 0.9
if (chunks[0] == "Tr" or chunks[0] == "d") and len(chunks) == 2:
materials[identifier]["transparent"] = True
if TRANSPARENCY == "invert":
materials[identifier]["transparency"] = 1.0 - float(chunks[1])
else:
materials[identifier]["transparency"] = float(chunks[1])
# Optical density
# Ni 1.0
if chunks[0] == "Ni" and len(chunks) == 2:
materials[identifier]["opticalDensity"] = float(chunks[1])
# Diffuse texture
# map_Kd texture_diffuse.jpg
if chunks[0] == "map_Kd" and len(chunks) == 2:
materials[identifier]["mapDiffuse"] = texture_relative_path(chunks[1])
# Ambient texture
# map_Ka texture_ambient.jpg
if chunks[0] == "map_Ka" and len(chunks) == 2:
materials[identifier]["mapAmbient"] = texture_relative_path(chunks[1])
# Specular texture
# map_Ks texture_specular.jpg
if chunks[0] == "map_Ks" and len(chunks) == 2:
materials[identifier]["mapSpecular"] = texture_relative_path(chunks[1])
# Alpha texture
# map_d texture_alpha.png
if chunks[0] == "map_d" and len(chunks) == 2:
materials[identifier]["mapAlpha"] = texture_relative_path(chunks[1])
# Bump texture
# map_bump texture_bump.jpg or bump texture_bump.jpg
if (chunks[0] == "map_bump" or chunks[0] == "bump") and len(chunks) == 2:
materials[identifier]["mapBump"] = texture_relative_path(chunks[1])
# Illumination
# illum 2
#
# 0. Color on and Ambient off
# 1. Color on and Ambient on
# 2. Highlight on
# 3. Reflection on and Ray trace on
# 4. Transparency: Glass on, Reflection: Ray trace on
# 5. Reflection: Fresnel on and Ray trace on
# 6. Transparency: Refraction on, Reflection: Fresnel off and Ray trace on
# 7. Transparency: Refraction on, Reflection: Fresnel on and Ray trace on
# 8. Reflection on and Ray trace off
# 9. Transparency: Glass on, Reflection: Ray trace off
# 10. Casts shadows onto invisible surfaces
if chunks[0] == "illum" and len(chunks) == 2:
materials[identifier]["illumination"] = int(chunks[1])
return materials
# #####################################################
# OBJ parser
# #####################################################
def parse_vertex(text):
"""Parse text chunk specifying single vertex.
Possible formats:
vertex index
vertex index / texture index
vertex index / texture index / normal index
vertex index / / normal index
"""
v = 0
t = 0
n = 0
chunks = text.split("/")
v = int(chunks[0])
if len(chunks) > 1:
if chunks[1]:
t = int(chunks[1])
if len(chunks) > 2:
if chunks[2]:
n = int(chunks[2])
return { 'v':v, 't':t, 'n':n }
def parse_obj(fname):
"""Parse OBJ file.
"""
vertices = []
normals = []
uvs = []
faces = []
materials = {}
material = ""
mcounter = 0
mcurrent = 0
mtllib = ""
# current face state
group = 0
object = 0
smooth = 0
for line in fileinput.input(fname):
chunks = line.split()
if len(chunks) > 0:
# Vertices as (x,y,z) coordinates
# v 0.123 0.234 0.345
if chunks[0] == "v" and len(chunks) == 4:
x = float(chunks[1])
y = float(chunks[2])
z = float(chunks[3])
vertices.append([x,y,z])
# Normals in (x,y,z) form; normals might not be unit
# vn 0.707 0.000 0.707
if chunks[0] == "vn" and len(chunks) == 4:
x = float(chunks[1])
y = float(chunks[2])
z = float(chunks[3])
normals.append([x,y,z])
# Texture coordinates in (u,v[,w]) coordinates, w is optional
# vt 0.500 -1.352 [0.234]
if chunks[0] == "vt" and len(chunks) >= 3:
u = float(chunks[1])
v = float(chunks[2])
w = 0
if len(chunks)>3:
w = float(chunks[3])
uvs.append([u,v,w])
# Face
if chunks[0] == "f" and len(chunks) >= 4:
vertex_index = []
uv_index = []
normal_index = []
# Precompute vert / normal / uv lists
# for negative index lookup
vertlen = len(vertices) + 1
normlen = len(normals) + 1
uvlen = len(uvs) + 1
for v in chunks[1:]:
vertex = parse_vertex(v)
if vertex['v']:
if vertex['v'] < 0:
vertex['v'] += vertlen
vertex_index.append(vertex['v'])
if vertex['t']:
if vertex['t'] < 0:
vertex['t'] += uvlen
uv_index.append(vertex['t'])
if vertex['n']:
if vertex['n'] < 0:
vertex['n'] += normlen
normal_index.append(vertex['n'])
faces.append({
'vertex':vertex_index,
'uv':uv_index,
'normal':normal_index,
'material':mcurrent,
'group':group,
'object':object,
'smooth':smooth,
})
# Group
if chunks[0] == "g" and len(chunks) == 2:
group = chunks[1]
# Object
if chunks[0] == "o" and len(chunks) == 2:
object = chunks[1]
# Materials definition
if chunks[0] == "mtllib" and len(chunks) == 2:
mtllib = chunks[1]
# Material
if chunks[0] == "usemtl":
if len(chunks) > 1:
material = chunks[1]
else:
material = ""
if not material in materials:
mcurrent = mcounter
materials[material] = mcounter
mcounter += 1
else:
mcurrent = materials[material]
# Smooth shading
if chunks[0] == "s" and len(chunks) == 2:
smooth = chunks[1]
return faces, vertices, uvs, normals, materials, mtllib
# #####################################################
# Generator - faces
# #####################################################
def setBit(value, position, on):
if on:
mask = 1 << position
return (value | mask)
else:
mask = ~(1 << position)
return (value & mask)
def generate_face(f, fc):
isTriangle = ( len(f['vertex']) == 3 )
if isTriangle:
nVertices = 3
else:
nVertices = 4
hasMaterial = True # for the moment OBJs without materials get default material
hasFaceUvs = False # not supported in OBJ
hasFaceVertexUvs = ( len(f['uv']) >= nVertices )
hasFaceNormals = False # don't export any face normals (as they are computed in engine)
hasFaceVertexNormals = ( len(f["normal"]) >= nVertices and SHADING == "smooth" )
hasFaceColors = BAKE_COLORS
hasFaceVertexColors = False # not supported in OBJ
faceType = 0
faceType = setBit(faceType, 0, not isTriangle)
faceType = setBit(faceType, 1, hasMaterial)
faceType = setBit(faceType, 2, hasFaceUvs)
faceType = setBit(faceType, 3, hasFaceVertexUvs)
faceType = setBit(faceType, 4, hasFaceNormals)
faceType = setBit(faceType, 5, hasFaceVertexNormals)
faceType = setBit(faceType, 6, hasFaceColors)
faceType = setBit(faceType, 7, hasFaceVertexColors)
faceData = []
# order is important, must match order in JSONLoader
# face type
# vertex indices
# material index
# face uvs index
# face vertex uvs indices
# face normal index
# face vertex normals indices
# face color index
# face vertex colors indices
faceData.append(faceType)
# must clamp in case on polygons bigger than quads
for i in xrange(nVertices):
index = f['vertex'][i] - 1
faceData.append(index)
faceData.append( f['material'] )
if hasFaceVertexUvs:
for i in xrange(nVertices):
index = f['uv'][i] - 1
faceData.append(index)
if hasFaceVertexNormals:
for i in xrange(nVertices):
index = f['normal'][i] - 1
faceData.append(index)
if hasFaceColors:
index = fc['material']
faceData.append(index)
return ",".join( map(str, faceData) )
# #####################################################
# Generator - chunks
# #####################################################
def hexcolor(c):
return ( int(c[0] * 255) << 16 ) + ( int(c[1] * 255) << 8 ) + int(c[2] * 255)
def generate_vertex(v, option_vertices_truncate, scale):
if not option_vertices_truncate:
return TEMPLATE_VERTEX % (v[0], v[1], v[2])
else:
return TEMPLATE_VERTEX_TRUNCATE % (scale * v[0], scale * v[1], scale * v[2])
def generate_normal(n):
return TEMPLATE_N % (n[0], n[1], n[2])
def generate_uv(uv):
return TEMPLATE_UV % (uv[0], uv[1])
def generate_color_rgb(c):
return TEMPLATE_COLOR % (c[0], c[1], c[2])
def generate_color_decimal(c):
return TEMPLATE_COLOR_DEC % hexcolor(c)
# #####################################################
# Morphs
# #####################################################
def generate_morph_vertex(name, vertices):
vertex_string = ",".join(generate_vertex(v, TRUNCATE, SCALE) for v in vertices)
return TEMPLATE_MORPH_VERTICES % (name, vertex_string)
def generate_morph_color(name, colors):
color_string = ",".join(generate_color_rgb(c) for c in colors)
return TEMPLATE_MORPH_COLORS % (name, color_string)
def extract_material_colors(materials, mtlfilename, basename):
"""Extract diffuse colors from MTL materials
"""
if not materials:
materials = { 'default': 0 }
mtl = create_materials(materials, mtlfilename, basename)
mtlColorArraySrt = []
for m in mtl:
if m in materials:
index = materials[m]
color = mtl[m].get("colorDiffuse", [1,0,0])
mtlColorArraySrt.append([index, color])
mtlColorArraySrt.sort()
mtlColorArray = [x[1] for x in mtlColorArraySrt]
return mtlColorArray
def extract_face_colors(faces, material_colors):
"""Extract colors from materials and assign them to faces
"""
faceColors = []
for face in faces:
material_index = face['material']
faceColors.append(material_colors[material_index])
return faceColors
def generate_morph_targets(morphfiles, n_vertices, infile):
skipOriginalMorph = False
norminfile = os.path.normpath(infile)
morphVertexData = []
for mfilepattern in morphfiles.split():
matches = glob.glob(mfilepattern)
matches.sort()
indices = range(0, len(matches), FRAMESTEP)
for i in indices:
path = matches[i]
normpath = os.path.normpath(path)
if normpath != norminfile or not skipOriginalMorph:
name = os.path.basename(normpath)
morphFaces, morphVertices, morphUvs, morphNormals, morphMaterials, morphMtllib = parse_obj(normpath)
n_morph_vertices = len(morphVertices)
if n_vertices != n_morph_vertices:
print "WARNING: skipping morph [%s] with different number of vertices [%d] than the original model [%d]" % (name, n_morph_vertices, n_vertices)
else:
if ALIGN == "center":
center(morphVertices)
elif ALIGN == "centerxz":
centerxz(morphVertices)
elif ALIGN == "bottom":
bottom(morphVertices)
elif ALIGN == "top":
top(morphVertices)
morphVertexData.append((get_name(name), morphVertices))
print "adding [%s] with %d vertices" % (name, n_morph_vertices)
morphTargets = ""
if len(morphVertexData):
morphTargets = "\n%s\n\t" % ",\n".join(generate_morph_vertex(name, vertices) for name, vertices in morphVertexData)
return morphTargets
def generate_morph_colors(colorfiles, n_vertices, n_faces):
morphColorData = []
colorFaces = []
materialColors = []
for mfilepattern in colorfiles.split():
matches = glob.glob(mfilepattern)
matches.sort()
for path in matches:
normpath = os.path.normpath(path)
name = os.path.basename(normpath)
morphFaces, morphVertices, morphUvs, morphNormals, morphMaterials, morphMtllib = parse_obj(normpath)
n_morph_vertices = len(morphVertices)
n_morph_faces = len(morphFaces)
if n_vertices != n_morph_vertices:
print "WARNING: skipping morph color map [%s] with different number of vertices [%d] than the original model [%d]" % (name, n_morph_vertices, n_vertices)
elif n_faces != n_morph_faces:
print "WARNING: skipping morph color map [%s] with different number of faces [%d] than the original model [%d]" % (name, n_morph_faces, n_faces)
else:
morphMaterialColors = extract_material_colors(morphMaterials, morphMtllib, normpath)
morphFaceColors = extract_face_colors(morphFaces, morphMaterialColors)
morphColorData.append((get_name(name), morphFaceColors))
# take first color map for baking into face colors
if len(colorFaces) == 0:
colorFaces = morphFaces
materialColors = morphMaterialColors
print "adding [%s] with %d face colors" % (name, len(morphFaceColors))
morphColors = ""
if len(morphColorData):
morphColors = "\n%s\n\t" % ",\n".join(generate_morph_color(name, colors) for name, colors in morphColorData)
return morphColors, colorFaces, materialColors
# #####################################################
# Materials
# #####################################################
def generate_color(i):
"""Generate hex color corresponding to integer.
Colors should have well defined ordering.
First N colors are hardcoded, then colors are random
(must seed random number generator with deterministic value
before getting colors).
"""
if i < len(COLORS):
#return "0x%06x" % COLORS[i]
return COLORS[i]
else:
#return "0x%06x" % int(0xffffff * random.random())
return int(0xffffff * random.random())
def value2string(v):
if type(v)==str and v[0:2] != "0x":
return '"%s"' % v
elif type(v) == bool:
return str(v).lower()
return str(v)
def generate_materials(mtl, materials):
"""Generate JS array of materials objects
JS material objects are basically prettified one-to-one
mappings of MTL properties in JSON format.
"""
mtl_array = []
for m in mtl:
if m in materials:
index = materials[m]
# add debug information
# materials should be sorted according to how
# they appeared in OBJ file (for the first time)
# this index is identifier used in face definitions
mtl[m]['DbgName'] = m
mtl[m]['DbgIndex'] = index
mtl[m]['DbgColor'] = generate_color(index)
if BAKE_COLORS:
mtl[m]['vertexColors'] = "face"
mtl_raw = ",\n".join(['\t"%s" : %s' % (n, value2string(v)) for n,v in sorted(mtl[m].items())])
mtl_string = "\t{\n%s\n\t}" % mtl_raw
mtl_array.append([index, mtl_string])
return ",\n\n".join([m for i,m in sorted(mtl_array)])
def generate_mtl(materials):
"""Generate dummy materials (if there is no MTL file).
"""
mtl = {}
for m in materials:
index = materials[m]
mtl[m] = {
'DbgName': m,
'DbgIndex': index,
'DbgColor': generate_color(index)
}
return mtl
def generate_materials_string(materials, mtlfilename, basename):
"""Generate final materials string.
"""
if not materials:
materials = { 'default': 0 }
mtl = create_materials(materials, mtlfilename, basename)
return generate_materials(mtl, materials)
def create_materials(materials, mtlfilename, basename):
"""Parse MTL file and create mapping between its materials and OBJ materials.
Eventual edge cases are handled here (missing materials, missing MTL file).
"""
random.seed(42) # to get well defined color order for debug colors
# default materials with debug colors for when
# there is no specified MTL / MTL loading failed,
# or if there were no materials / null materials
mtl = generate_mtl(materials)
if mtlfilename:
# create full pathname for MTL (included from OBJ)
path = os.path.dirname(basename)
fname = os.path.join(path, mtlfilename)
if file_exists(fname):
# override default materials with real ones from MTL
# (where they exist, otherwise keep defaults)
mtl.update(parse_mtl(fname))
else:
print "Couldn't find [%s]" % fname
return mtl
# #####################################################
# Faces
# #####################################################
def is_triangle_flat(f):
return len(f['vertex'])==3 and not (f["normal"] and SHADING == "smooth") and not f['uv']
def is_triangle_flat_uv(f):
return len(f['vertex'])==3 and not (f["normal"] and SHADING == "smooth") and len(f['uv'])==3
def is_triangle_smooth(f):
return len(f['vertex'])==3 and f["normal"] and SHADING == "smooth" and not f['uv']
def is_triangle_smooth_uv(f):
return len(f['vertex'])==3 and f["normal"] and SHADING == "smooth" and len(f['uv'])==3
def is_quad_flat(f):
return len(f['vertex'])==4 and not (f["normal"] and SHADING == "smooth") and not f['uv']
def is_quad_flat_uv(f):
return len(f['vertex'])==4 and not (f["normal"] and SHADING == "smooth") and len(f['uv'])==4
def is_quad_smooth(f):
return len(f['vertex'])==4 and f["normal"] and SHADING == "smooth" and not f['uv']
def is_quad_smooth_uv(f):
return len(f['vertex'])==4 and f["normal"] and SHADING == "smooth" and len(f['uv'])==4
def sort_faces(faces):
data = {
'triangles_flat': [],
'triangles_flat_uv': [],
'triangles_smooth': [],
'triangles_smooth_uv': [],
'quads_flat': [],
'quads_flat_uv': [],
'quads_smooth': [],
'quads_smooth_uv': []
}