forked from bartvdbraak/blender
510 lines
16 KiB
Python
510 lines
16 KiB
Python
#!BPY
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"""
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Name: 'Wavefront (.obj)...'
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Blender: 232
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Group: 'Import'
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Tooltip: 'Load a Wavefront OBJ File'
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"""
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__author__ = "Campbell Barton"
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__url__ = ["blender", "elysiun"]
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__version__ = "0.9"
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__bpydoc__ = """\
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This script imports OBJ files to Blender.
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Usage:
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Run this script from "File->Import" menu and then load the desired OBJ file.
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"""
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# $Id$
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#
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# --------------------------------------------------------------------------
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# OBJ Import v0.9 by Campbell Barton (AKA Ideasman)
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# --------------------------------------------------------------------------
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# ***** BEGIN GPL LICENSE BLOCK *****
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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# ***** END GPL LICENCE BLOCK *****
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# --------------------------------------------------------------------------
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NULL_MAT = '(null)' # Name for mesh's that have no mat set.
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NULL_IMG = '(null)' # Name for mesh's that have no mat set.
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MATLIMIT = 16 # This isnt about to change but probably should not be hard coded.
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DIR = ''
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#==============================================#
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# Return directory, where is file #
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#==============================================#
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def pathName(path,name):
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length=len(path)
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for CH in range(1, length):
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if path[length-CH:] == name:
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path = path[:length-CH]
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break
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return path
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#==============================================#
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# Strips the slashes from the back of a string #
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#==============================================#
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def stripPath(path):
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for CH in range(len(path), 0, -1):
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if path[CH-1] == "/" or path[CH-1] == "\\":
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path = path[CH:]
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break
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return path
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#====================================================#
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# Strips the prefix off the name before writing #
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#====================================================#
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def stripName(name): # name is a string
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prefixDelimiter = '.'
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return name[ : name.find(prefixDelimiter) ]
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from Blender import *
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#==================================================================================#
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# This gets a mat or creates one of the requested name if none exist. #
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#==================================================================================#
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def getMat(matName):
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# Make a new mat
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try:
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return Material.Get(matName)
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except:
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return Material.New(matName)
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#==================================================================================#
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# This function sets textures defined in .mtl file #
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#==================================================================================#
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def getImg(img_fileName):
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for i in Image.Get():
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if i.filename == img_fileName:
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return i
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# if we are this far it means the image hasnt been loaded.
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try:
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return Image.Load(img_fileName)
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except:
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print "unable to open", img_fileName
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return
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#==================================================================================#
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# This function sets textures defined in .mtl file #
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#==================================================================================#
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def load_mat_image(mat, img_fileName, type, mesh):
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try:
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image = Image.Load(img_fileName)
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except:
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print "unable to open", img_fileName
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return
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texture = Texture.New(type)
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texture.setType('Image')
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texture.image = image
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# adds textures to faces (Textured/Alt-Z mode)
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# Only apply the diffuse texture to the face if the image has not been set with the inline usemat func.
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if type == 'Kd':
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for f in mesh.faces:
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if mesh.materials[f.mat].name == mat.name:
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# the inline usemat command overides the material Image
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if not f.image:
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f.image = image
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# adds textures for materials (rendering)
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if type == 'Ka':
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mat.setTexture(0, texture, Texture.TexCo.UV, Texture.MapTo.CMIR)
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if type == 'Kd':
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mat.setTexture(1, texture, Texture.TexCo.UV, Texture.MapTo.COL)
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if type == 'Ks':
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mat.setTexture(2, texture, Texture.TexCo.UV, Texture.MapTo.SPEC)
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#==================================================================================#
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# This function loads materials from .mtl file (have to be defined in obj file) #
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#==================================================================================#
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def load_mtl(dir, mtl_file, mesh):
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# Remove ./
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if mtl_file[:2] == './':
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mtl_file= mtl_file[2:]
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mtl_fileName = dir + mtl_file
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try:
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fileLines= open(mtl_fileName, 'r').readlines()
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except:
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print "unable to open", mtl_fileName
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return
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lIdx=0
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while lIdx < len(fileLines):
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l = fileLines[lIdx].split()
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# Detect a line that will be ignored
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if len(l) == 0:
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pass
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elif l[0] == '#' or len(l) == 0:
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pass
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elif l[0] == 'newmtl':
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currentMat = getMat(' '.join(l[1:]))
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elif l[0] == 'Ka':
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currentMat.setMirCol(float(l[1]), float(l[2]), float(l[3]))
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elif l[0] == 'Kd':
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currentMat.setRGBCol(float(l[1]), float(l[2]), float(l[3]))
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elif l[0] == 'Ks':
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currentMat.setSpecCol(float(l[1]), float(l[2]), float(l[3]))
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elif l[0] == 'Ns':
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currentMat.setHardness( int((float(l[1])*0.51)) )
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elif l[0] == 'd':
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currentMat.setAlpha(float(l[1]))
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elif l[0] == 'Tr':
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currentMat.setAlpha(float(l[1]))
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elif l[0] == 'map_Ka':
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img_fileName = dir + l[1]
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load_mat_image(currentMat, img_fileName, 'Ka', mesh)
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elif l[0] == 'map_Ks':
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img_fileName = dir + l[1]
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load_mat_image(currentMat, img_fileName, 'Ks', mesh)
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elif l[0] == 'map_Kd':
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img_fileName = dir + l[1]
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load_mat_image(currentMat, img_fileName, 'Kd', mesh)
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lIdx+=1
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#======================================================================#
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# Returns unique name of object (preserve overwriting existing meshes) #
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#======================================================================#
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def getUniqueName(name):
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uniqueInt = 0
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while 1:
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try:
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ob = Object.Get(name)
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# Okay, this is working, so lets make a new name
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name += '.' + str(uniqueInt)
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uniqueInt +=1
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except:
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if NMesh.GetRaw(name) == None:
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return name
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else:
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name += '.' + str(uniqueInt)
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uniqueInt +=1
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#==================================================================================#
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# This loads data from .obj file #
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#==================================================================================#
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def load_obj(file):
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time1 = sys.time()
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def applyMat(mesh, f, mat):
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# Check weather the 16 mat limit has been met.
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if len( meshList[objectName][0].materials ) >= MATLIMIT:
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print 'Warning, max material limit reached, using an existing material'
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return meshList[objectName][0]
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mIdx = 0
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for m in meshList[objectName][0].materials:
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if m.getName() == mat.getName():
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break
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mIdx+=1
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if mIdx == len(mesh.materials):
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meshList[objectName][0].addMaterial(mat)
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f.mat = mIdx
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return f
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# Get the file name with no path or .obj
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fileName = stripName( stripPath(file) )
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mtl_fileName = ''
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DIR = pathName(file, stripPath(file))
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fileLines = open(file, 'r').readlines()
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uvMapList = [(0,0)] # store tuple uv pairs here
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# This dummy vert makes life a whole lot easier-
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# pythons index system then aligns with objs, remove later
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vertList = [NMesh.Vert(0, 0, 0)] # store tuple uv pairs here
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nullMat = getMat(NULL_MAT)
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currentMat = nullMat # Use this mat.
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currentImg = NULL_IMG # Null image is a string, otherwise this should be set to an image object.\
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currentSmooth = 0
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#==================================================================================#
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# Make split lines, ignore blenk lines or comments. #
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#==================================================================================#
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lIdx = 0
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while lIdx < len(fileLines):
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fileLines[lIdx] = fileLines[lIdx].split()
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lIdx+=1
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#==================================================================================#
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# Load all verts first (texture verts too) #
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#==================================================================================#
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lIdx = 0
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print len(fileLines)
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while lIdx < len(fileLines):
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l = fileLines[lIdx]
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if len(l) == 0:
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fileLines.pop(lIdx)
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lIdx-=1
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elif l[0] == 'v':
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# This is a new vert, make a new mesh
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vertList.append( NMesh.Vert(float(l[1]), float(l[2]), float(l[3]) ) )
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fileLines.pop(lIdx)
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lIdx-=1
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# UV COORDINATE
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elif l[0] == 'vt':
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# This is a new vert, make a new mesh
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uvMapList.append( (float(l[1]), float(l[2])) )
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fileLines.pop(lIdx)
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lIdx-=1
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lIdx+=1
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# Here we store a boolean list of which verts are used or not
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# no we know weather to add them to the current mesh
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# This is an issue with global vertex indicies being translated to per mesh indicies
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# like blenders, we start with a dummy just like the vert.
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# -1 means unused, any other value refers to the local mesh index of the vert.
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# objectName has a char in front of it that determins weather its a group or object.
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# We ignore it when naming the object.
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objectName = 'omesh' # If we cant get one, use this
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meshList = {}
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meshList[objectName] = (NMesh.GetRaw(), [-1]*len(vertList)) # Mesh/meshList[objectName][1]
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meshList[objectName][0].verts.append(vertList[0])
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meshList[objectName][0].hasFaceUV(1)
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#==================================================================================#
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# Load all faces into objects, main loop #
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#==================================================================================#
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lIdx = 0
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# Face and Object loading LOOP
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while lIdx < len(fileLines):
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l = fileLines[lIdx]
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# VERTEX
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if l[0] == 'v':
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pass
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# Comment
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if l[0] == '#':
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pass
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# VERTEX NORMAL
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elif l[0] == 'vn':
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pass
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# UV COORDINATE
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elif l[0] == 'vt':
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pass
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# FACE
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elif l[0] == 'f':
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# Make a face with the correct material.
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f = NMesh.Face()
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f = applyMat(meshList[objectName][0], f, currentMat)
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f.smooth = currentSmooth
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if currentImg != NULL_IMG: f.image = currentImg
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# Set up vIdxLs : Verts
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# Set up vtIdxLs : UV
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# Start with a dummy objects so python accepts OBJs 1 is the first index.
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vIdxLs = []
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vtIdxLs = []
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fHasUV = len(uvMapList)-1 # Assume the face has a UV until it sho it dosent, if there are no UV coords then this will start as 0.
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for v in l[1:]:
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# OBJ files can have // or / to seperate vert/texVert/normal
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# this is a bit of a pain but we must deal with it.
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objVert = v.split('/', -1)
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# Vert Index - OBJ supports negative index assignment (like python)
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vIdxLs.append(int(objVert[0]))
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if fHasUV:
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# UV
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if len(objVert) == 1:
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vtIdxLs.append(int(objVert[0])) # Sticky UV coords
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elif objVert[1] != '': # Its possible that theres no texture vert just he vert and normal eg 1//2
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vtIdxLs.append(int(objVert[1])) # Seperate UV coords
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else:
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fHasUV = 0
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# Dont add a UV to the face if its larger then the UV coord list
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# The OBJ file would have to be corrupt or badly written for thi to happen
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# but account for it anyway.
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if len(vtIdxLs) > 0:
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if vtIdxLs[-1] > len(uvMapList):
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fHasUV = 0
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print 'badly written OBJ file, invalid references to UV Texture coordinates.'
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# Quads only, we could import quads using the method below but it polite to import a quad as a quad.
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if len(vIdxLs) == 4:
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for i in [0,1,2,3]:
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if meshList[objectName][1][vIdxLs[i]] == -1:
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meshList[objectName][0].verts.append(vertList[vIdxLs[i]])
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f.v.append(meshList[objectName][0].verts[-1])
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meshList[objectName][1][vIdxLs[i]] = len(meshList[objectName][0].verts)-1
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else:
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f.v.append(meshList[objectName][0].verts[meshList[objectName][1][vIdxLs[i]]])
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# UV MAPPING
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if fHasUV:
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f.uv.extend([uvMapList[ vtIdxLs[0] ],uvMapList[ vtIdxLs[1] ],uvMapList[ vtIdxLs[2] ],uvMapList[ vtIdxLs[3] ]])
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#for i in [0,1,2,3]:
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# f.uv.append( uvMapList[ vtIdxLs[i] ] )
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if f.v > 0:
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f = applyMat(meshList[objectName][0], f, currentMat)
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if currentImg != NULL_IMG:
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f.image = currentImg
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meshList[objectName][0].faces.append(f) # move the face onto the mesh
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if len(meshList[objectName][0].faces[-1]) > 0:
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meshList[objectName][0].faces[-1].smooth = currentSmooth
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elif len(vIdxLs) >= 3: # This handles tri's and fans
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for i in range(len(vIdxLs)-2):
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f = NMesh.Face()
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f = applyMat(meshList[objectName][0], f, currentMat)
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for ii in [0, i+1, i+2]:
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if meshList[objectName][1][vIdxLs[ii]] == -1:
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meshList[objectName][0].verts.append(vertList[vIdxLs[ii]])
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f.v.append(meshList[objectName][0].verts[-1])
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meshList[objectName][1][vIdxLs[ii]] = len(meshList[objectName][0].verts)-1
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else:
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f.v.append(meshList[objectName][0].verts[meshList[objectName][1][vIdxLs[ii]]])
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# UV MAPPING
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if fHasUV:
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f.uv.extend([uvMapList[ vtIdxLs[0] ], uvMapList[ vtIdxLs[i+1] ], uvMapList[ vtIdxLs[i+2] ]])
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if f.v > 0:
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f = applyMat(meshList[objectName][0], f, currentMat)
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if currentImg != NULL_IMG:
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f.image = currentImg
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meshList[objectName][0].faces.append(f) # move the face onto the mesh
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if len(meshList[objectName][0].faces[-1]) > 0:
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meshList[objectName][0].faces[-1].smooth = currentSmooth
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# FACE SMOOTHING
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elif l[0] == 's':
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if l[1] == 'off': currentSmooth = 0
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else: currentSmooth = 1
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# print "smoothing", currentSmooth
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# OBJECT / GROUP
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elif l[0] == 'o' or l[0] == 'g':
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# This makes sure that if an object and a group have the same name then
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# they are not put into the same object.
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# Only make a new group.object name if the verts in the existing object have been used, this is obscure
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# but some files face groups seperating verts and faces which results in silly things. (no groups have names.)
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if len(l) == 1 and len( meshList[objectName][0].faces ) == 0:
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pass
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else:
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newObjectName = l[0] + '_'
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# if there is no groups name then make gp_1, gp_2, gp_100 etc
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if len(l) == 1: # No name given, make a unique name up.
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unique_count = 0
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while newObjectName in meshList.keys():
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newObjectName = l[0] + '_' + str(unique_count)
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unique_count +=1
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else: # The the object/group name given
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newObjectName += '_'.join(l[1:])
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# Assign the new name
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objectName = newObjectName
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# If we havnt written to this mesh before then do so.
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# if we have then we'll just keep appending to it, this is required for soem files.
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if objectName not in meshList.keys():
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meshList[objectName] = (NMesh.GetRaw(), [-1]*len(vertList))
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meshList[objectName][0].hasFaceUV(1)
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meshList[objectName][0].verts.append( vertList[0] )
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# MATERIAL
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elif l[0] == 'usemtl':
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if l[1] == '(null)':
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currentMat = getMat(NULL_MAT)
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else:
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currentMat = getMat(' '.join(l[1:])) # Use join in case of spaces
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# MATERIAL
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elif l[0] == 'usemat':
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if l[1] == '(null)':
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currentImg = NULL_IMG
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else:
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currentImg = getImg(DIR + ' '.join(l[1:])) # Use join in case of spaces
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# MATERIAL FILE
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elif l[0] == 'mtllib':
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mtl_fileName = ' '.join(l[1:])
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lIdx+=1
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#==============================================#
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# Write all meshs in the dictionary #
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#==============================================#
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for mk in meshList.keys():
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# Applies material properties to materials alredy on the mesh as well as Textures.
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if mtl_fileName != '':
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load_mtl(DIR, mtl_fileName, meshList[mk][0])
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if len(meshList[mk][0].verts) >1:
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meshList[mk][0].verts.pop(0)
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name = getUniqueName(mk)
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ob = NMesh.PutRaw(meshList[mk][0], name)
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ob.name = name
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print "obj import time: ", sys.time() - time1
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Window.FileSelector(load_obj, 'Import Wavefront OBJ')
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# For testing compatibility
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#import os
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#for obj in os.listdir('/obj/'):
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# if obj[-3:] == 'obj':
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# print obj
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# newScn = Scene.New(obj)
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# newScn.makeCurrent()
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# load_obj('/obj/' + obj)
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