import_obj.py

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#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
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#
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#  but WITHOUT ANY WARRANTY; without even the implied warranty of
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#  along with this program; if not, write to the Free Software Foundation,
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# ##### END GPL LICENSE BLOCK #####

# <pep8 compliant>

# Script copyright (C) Campbell Barton
# Contributors: Campbell Barton, Jiri Hnidek, Paolo Ciccone

"""
This script imports a Wavefront OBJ files to Blender.

Usage:
Run this script from "File->Import" menu and then load the desired OBJ file.
Note, This loads mesh objects and materials only, nurbs and curves are not supported.

http://wiki.blender.org/index.php/Scripts/Manual/Import/wavefront_obj
"""

import os
import time
import bpy
import mathutils
from mathutils.geometry import tesselate_polygon
from io_utils import load_image, unpack_list, unpack_face_list


def BPyMesh_ngon(from_data, indices, PREF_FIX_LOOPS= True):
    '''
    Takes a polyline of indices (fgon)
    and returns a list of face indicie lists.
    Designed to be used for importers that need indices for an fgon to create from existing verts.

    from_data: either a mesh, or a list/tuple of vectors.
    indices: a list of indicies to use this list is the ordered closed polyline to fill, and can be a subset of the data given.
    PREF_FIX_LOOPS: If this is enabled polylines that use loops to make multiple polylines are delt with correctly.
    '''

    if not set: # Need sets for this, otherwise do a normal fill.
        PREF_FIX_LOOPS= False

    Vector= mathutils.Vector
    if not indices:
        return []

    #    return []
    def rvec(co): return round(co.x, 6), round(co.y, 6), round(co.z, 6)
    def mlen(co): return abs(co[0])+abs(co[1])+abs(co[2]) # manhatten length of a vector, faster then length

    def vert_treplet(v, i):
        return v, rvec(v), i, mlen(v)

    def ed_key_mlen(v1, v2):
        if v1[3] > v2[3]:
            return v2[1], v1[1]
        else:
            return v1[1], v2[1]


    if not PREF_FIX_LOOPS:
        '''
        Normal single concave loop filling
        '''
        if type(from_data) in (tuple, list):
            verts= [Vector(from_data[i]) for ii, i in enumerate(indices)]
        else:
            verts= [from_data.vertices[i].co for ii, i in enumerate(indices)]

        for i in range(len(verts)-1, 0, -1): # same as reversed(xrange(1, len(verts))):
            if verts[i][1]==verts[i-1][0]:
                verts.pop(i-1)

        fill= fill_polygon([verts])

    else:
        '''
        Seperate this loop into multiple loops be finding edges that are used twice
        This is used by lightwave LWO files a lot
        '''

        if type(from_data) in (tuple, list):
            verts= [vert_treplet(Vector(from_data[i]), ii) for ii, i in enumerate(indices)]
        else:
            verts= [vert_treplet(from_data.vertices[i].co, ii) for ii, i in enumerate(indices)]

        edges= [(i, i-1) for i in range(len(verts))]
        if edges:
            edges[0]= (0,len(verts)-1)

        if not verts:
            return []


        edges_used= set()
        edges_doubles= set()
        # We need to check if any edges are used twice location based.
        for ed in edges:
            edkey= ed_key_mlen(verts[ed[0]], verts[ed[1]])
            if edkey in edges_used:
                edges_doubles.add(edkey)
            else:
                edges_used.add(edkey)

        # Store a list of unconnected loop segments split by double edges.
        # will join later
        loop_segments= []

        v_prev= verts[0]
        context_loop= [v_prev]
        loop_segments= [context_loop]

        for v in verts:
            if v!=v_prev:
                # Are we crossing an edge we removed?
                if ed_key_mlen(v, v_prev) in edges_doubles:
                    context_loop= [v]
                    loop_segments.append(context_loop)
                else:
                    if context_loop and context_loop[-1][1]==v[1]:
                        #raise "as"
                        pass
                    else:
                        context_loop.append(v)

                v_prev= v
        # Now join loop segments

        def join_seg(s1,s2):
            if s2[-1][1]==s1[0][1]: #
                s1,s2= s2,s1
            elif s1[-1][1]==s2[0][1]:
                pass
            else:
                return False

            # If were stuill here s1 and s2 are 2 segments in the same polyline
            s1.pop() # remove the last vert from s1
            s1.extend(s2) # add segment 2 to segment 1

            if s1[0][1]==s1[-1][1]: # remove endpoints double
                s1.pop()

            s2[:]= [] # Empty this segment s2 so we dont use it again.
            return True

        joining_segments= True
        while joining_segments:
            joining_segments= False
            segcount= len(loop_segments)

            for j in range(segcount-1, -1, -1): #reversed(range(segcount)):
                seg_j= loop_segments[j]
                if seg_j:
                    for k in range(j-1, -1, -1): # reversed(range(j)):
                        if not seg_j:
                            break
                        seg_k= loop_segments[k]

                        if seg_k and join_seg(seg_j, seg_k):
                            joining_segments= True

        loop_list= loop_segments

        for verts in loop_list:
            while verts and verts[0][1]==verts[-1][1]:
                verts.pop()

        loop_list= [verts for verts in loop_list if len(verts)>2]
        # DONE DEALING WITH LOOP FIXING


        # vert mapping
        vert_map= [None]*len(indices)
        ii=0
        for verts in loop_list:
            if len(verts)>2:
                for i, vert in enumerate(verts):
                    vert_map[i+ii]= vert[2]
                ii+=len(verts)

        fill= tesselate_polygon([ [v[0] for v in loop] for loop in loop_list ])
        #draw_loops(loop_list)
        #raise 'done loop'
        # map to original indicies
        fill= [[vert_map[i] for i in reversed(f)] for f in fill]


    if not fill:
        print('Warning Cannot scanfill, fallback on a triangle fan.')
        fill= [ [0, i-1, i] for i in range(2, len(indices)) ]
    else:
        # Use real scanfill.
        # See if its flipped the wrong way.
        flip= None
        for fi in fill:
            if flip != None:
                break
            for i, vi in enumerate(fi):
                if vi==0 and fi[i-1]==1:
                    flip= False
                    break
                elif vi==1 and fi[i-1]==0:
                    flip= True
                    break

        if not flip:
            for i, fi in enumerate(fill):
                fill[i]= tuple([ii for ii in reversed(fi)])

    return fill

def line_value(line_split):
    '''
    Returns 1 string represneting the value for this line
    None will be returned if theres only 1 word
    '''
    length= len(line_split)
    if length == 1:
        return None

    elif length == 2:
        return line_split[1]

    elif length > 2:
        return ' '.join( line_split[1:] )


def obj_image_load(imagepath, DIR, IMAGE_SEARCH):
    if '_' in imagepath:
        image= load_image(imagepath.replace('_', ' '), DIR)
        if image:
            return image

    image = load_image(imagepath, DIR)
    if image:
        return image

    print("failed to load '%s' doesn't exist", imagepath)
    return None

# def obj_image_load(imagepath, DIR, IMAGE_SEARCH):
#     '''
#     Mainly uses comprehensiveImageLoad
#     but tries to replace '_' with ' ' for Max's exporter replaces spaces with underscores.
#     '''

#     if '_' in imagepath:
#         image= BPyImage.comprehensiveImageLoad(imagepath, DIR, PLACE_HOLDER= False, RECURSIVE= IMAGE_SEARCH)
#         if image: return image
#         # Did the exporter rename the image?
#         image= BPyImage.comprehensiveImageLoad(imagepath.replace('_', ' '), DIR, PLACE_HOLDER= False, RECURSIVE= IMAGE_SEARCH)
#         if image: return image

#     # Return an image, placeholder if it dosnt exist
#     image= BPyImage.comprehensiveImageLoad(imagepath, DIR, PLACE_HOLDER= True, RECURSIVE= IMAGE_SEARCH)
#     return image


def create_materials(filepath, material_libs, unique_materials, unique_material_images, IMAGE_SEARCH):
    '''
    Create all the used materials in this obj,
    assign colors and images to the materials from all referenced material libs
    '''
    DIR= os.path.dirname(filepath)

    #==================================================================================#
    # This function sets textures defined in .mtl file                                 #
    #==================================================================================#
    def load_material_image(blender_material, context_material_name, imagepath, type):

        texture= bpy.data.textures.new(name=type, type='IMAGE')

        # Absolute path - c:\.. etc would work here
        image = obj_image_load(imagepath, DIR, IMAGE_SEARCH)
        has_data = False

        if image:
            texture.image = image
            has_data = image.has_data

        # Adds textures for materials (rendering)
        if type == 'Kd':
            if has_data and image.depth == 32:
                # Image has alpha

                mtex = blender_material.texture_slots.add()
                mtex.texture = texture
                mtex.texture_coords = 'UV'
                mtex.use_map_color_diffuse = True
                mtex.use_map_alpha = True

                texture.mipmap = True
                texture.interpolation = True
                texture.use_alpha = True
                blender_material.use_transparency = True
                blender_material.alpha = 0.0
            else:
                mtex = blender_material.texture_slots.add()
                mtex.texture = texture
                mtex.texture_coords = 'UV'
                mtex.use_map_color_diffuse = True

            # adds textures to faces (Textured/Alt-Z mode)
            # Only apply the diffuse texture to the face if the image has not been set with the inline usemat func.
            unique_material_images[context_material_name]= image, has_data # set the texface image

        elif type == 'Ka':
            mtex = blender_material.texture_slots.add()
            mtex.texture = texture
            mtex.texture_coords = 'UV'
            mtex.use_map_ambient = True

        elif type == 'Ks':
            mtex = blender_material.texture_slots.add()
            mtex.texture = texture
            mtex.texture_coords = 'UV'
            mtex.use_map_specular = True

        elif type == 'Bump':
            mtex = blender_material.texture_slots.add()
            mtex.texture = texture
            mtex.texture_coords = 'UV'
            mtex.use_map_normal = True

        elif type == 'D':
            mtex = blender_material.texture_slots.add()
            mtex.texture = texture
            mtex.texture_coords = 'UV'
            mtex.use_map_alpha = True
            blender_material.use_transparency = True
            blender_material.transparency_method = 'Z_TRANSPARENCY'
            blender_material.alpha = 0.0
            # Todo, unset deffuse material alpha if it has an alpha channel

        elif type == 'refl':
            mtex = blender_material.texture_slots.add()
            mtex.texture = texture
            mtex.texture_coords = 'UV'
            mtex.use_map_reflect = True


    # Add an MTL with the same name as the obj if no MTLs are spesified.
    temp_mtl = os.path.splitext((os.path.basename(filepath)))[0] + '.mtl'

    if os.path.exists(os.path.join(DIR, temp_mtl)) and temp_mtl not in material_libs:
        material_libs.append( temp_mtl )
    del temp_mtl

    #Create new materials
    for name in unique_materials: # .keys()
        if name != None:
            unique_materials[name]= bpy.data.materials.new(name)
            unique_material_images[name]= None, False # assign None to all material images to start with, add to later.

    unique_materials[None]= None
    unique_material_images[None]= None, False

    for libname in material_libs:
        mtlpath= os.path.join(DIR, libname)
        if not os.path.exists(mtlpath):
            print ("\tError Missing MTL: '%s'" % mtlpath)
        else:
            #print '\t\tloading mtl: "%s"' % mtlpath
            context_material= None
            mtl= open(mtlpath, 'rU')
            for line in mtl: #.xreadlines():
                if line.startswith('newmtl'):
                    context_material_name= line_value(line.split())
                    if context_material_name in unique_materials:
                        context_material = unique_materials[ context_material_name ]
                    else:
                        context_material = None

                elif context_material:
                    # we need to make a material to assign properties to it.
                    line_split= line.split()
                    line_lower= line.lower().lstrip()
                    if line_lower.startswith('ka'):
                        context_material.mirror_color = float(line_split[1]), float(line_split[2]), float(line_split[3])
                    elif line_lower.startswith('kd'):
                        context_material.diffuse_color = float(line_split[1]), float(line_split[2]), float(line_split[3])
                    elif line_lower.startswith('ks'):
                        context_material.specular_color = float(line_split[1]), float(line_split[2]), float(line_split[3])
                    elif line_lower.startswith('ns'):
                        context_material.specular_hardness = int((float(line_split[1]) * 0.51))
                    elif line_lower.startswith('ni'): # Refraction index
                        context_material.raytrace_transparency.ior = max(1, min(float(line_split[1]), 3))  # between 1 and 3
                    elif line_lower.startswith('d') or line_lower.startswith('tr'):
                        context_material.alpha = float(line_split[1])
                        context_material.use_transparency = True
                        context_material.transparency_method = 'Z_TRANSPARENCY'
                    elif line_lower.startswith('map_ka'):
                        img_filepath= line_value(line.split())
                        if img_filepath:
                            load_material_image(context_material, context_material_name, img_filepath, 'Ka')
                    elif line_lower.startswith('map_ks'):
                        img_filepath= line_value(line.split())
                        if img_filepath:
                            load_material_image(context_material, context_material_name, img_filepath, 'Ks')
                    elif line_lower.startswith('map_kd'):
                        img_filepath= line_value(line.split())
                        if img_filepath:
                            load_material_image(context_material, context_material_name, img_filepath, 'Kd')
                    elif line_lower.startswith('map_bump'):
                        img_filepath= line_value(line.split())
                        if img_filepath:
                            load_material_image(context_material, context_material_name, img_filepath, 'Bump')
                    elif line_lower.startswith('map_d') or line_lower.startswith('map_tr'):  # Alpha map - Dissolve
                        img_filepath= line_value(line.split())
                        if img_filepath:
                            load_material_image(context_material, context_material_name, img_filepath, 'D')

                    elif line_lower.startswith('refl'):  # reflectionmap
                        img_filepath= line_value(line.split())
                        if img_filepath:
                            load_material_image(context_material, context_material_name, img_filepath, 'refl')
            mtl.close()




def split_mesh(verts_loc, faces, unique_materials, filepath, SPLIT_OB_OR_GROUP):
    '''
    Takes vert_loc and faces, and separates into multiple sets of
    (verts_loc, faces, unique_materials, dataname)
    '''

    filename = os.path.splitext((os.path.basename(filepath)))[0]

    if not SPLIT_OB_OR_GROUP:
        # use the filename for the object name since we arnt chopping up the mesh.
        return [(verts_loc, faces, unique_materials, filename)]

    def key_to_name(key):
        # if the key is a tuple, join it to make a string
        if not key:
            return filename # assume its a string. make sure this is true if the splitting code is changed
        else:
            return key

    # Return a key that makes the faces unique.
    face_split_dict= {}

    oldkey= -1 # initialize to a value that will never match the key

    for face in faces:
        key= face[4]

        if oldkey != key:
            # Check the key has changed.
            try:
                verts_split, faces_split, unique_materials_split, vert_remap= face_split_dict[key]
            except KeyError:
                faces_split= []
                verts_split= []
                unique_materials_split= {}
                vert_remap= [-1]*len(verts_loc)

                face_split_dict[key]= (verts_split, faces_split, unique_materials_split, vert_remap)

            oldkey= key

        face_vert_loc_indicies= face[0]

        # Remap verts to new vert list and add where needed
        for enum, i in enumerate(face_vert_loc_indicies):
            if vert_remap[i] == -1:
                new_index= len(verts_split)
                vert_remap[i]= new_index # set the new remapped index so we only add once and can reference next time.
                face_vert_loc_indicies[enum] = new_index # remap to the local index
                verts_split.append( verts_loc[i] ) # add the vert to the local verts
            else:
                face_vert_loc_indicies[enum] = vert_remap[i] # remap to the local index

            matname= face[2]
            if matname and matname not in unique_materials_split:
                unique_materials_split[matname] = unique_materials[matname]

        faces_split.append(face)

    # remove one of the itemas and reorder
    return [(value[0], value[1], value[2], key_to_name(key)) for key, value in list(face_split_dict.items())]


def create_mesh(new_objects, has_ngons, CREATE_FGONS, CREATE_EDGES, verts_loc, verts_tex, faces, unique_materials, unique_material_images, unique_smooth_groups, vertex_groups, dataname):
    '''
    Takes all the data gathered and generates a mesh, adding the new object to new_objects
    deals with fgons, sharp edges and assigning materials
    '''
    if not has_ngons:
        CREATE_FGONS= False

    if unique_smooth_groups:
        sharp_edges= {}
        smooth_group_users = {context_smooth_group: {} for context_smooth_group in list(unique_smooth_groups.keys())}
        context_smooth_group_old= -1

    # Split fgons into tri's
    fgon_edges= {} # Used for storing fgon keys
    if CREATE_EDGES:
        edges= []

    context_object= None

    # reverse loop through face indicies
    for f_idx in range(len(faces)-1, -1, -1):

        face_vert_loc_indicies,\
        face_vert_tex_indicies,\
        context_material,\
        context_smooth_group,\
        context_object= faces[f_idx]

        len_face_vert_loc_indicies = len(face_vert_loc_indicies)

        if len_face_vert_loc_indicies==1:
            faces.pop(f_idx)# cant add single vert faces

        elif not face_vert_tex_indicies or len_face_vert_loc_indicies == 2: # faces that have no texture coords are lines
            if CREATE_EDGES:
                # generators are better in python 2.4+ but can't be used in 2.3
                # edges.extend( (face_vert_loc_indicies[i], face_vert_loc_indicies[i+1]) for i in xrange(len_face_vert_loc_indicies-1) )
                edges.extend( [(face_vert_loc_indicies[i], face_vert_loc_indicies[i+1]) for i in range(len_face_vert_loc_indicies-1)] )

            faces.pop(f_idx)
        else:

            # Smooth Group
            if unique_smooth_groups and context_smooth_group:
                # Is a part of of a smooth group and is a face
                if context_smooth_group_old is not context_smooth_group:
                    edge_dict= smooth_group_users[context_smooth_group]
                    context_smooth_group_old= context_smooth_group

                for i in range(len_face_vert_loc_indicies):
                    i1= face_vert_loc_indicies[i]
                    i2= face_vert_loc_indicies[i-1]
                    if i1>i2: i1,i2= i2,i1

                    try:
                        edge_dict[i1,i2]+= 1
                    except KeyError:
                        edge_dict[i1,i2]=  1

            # FGons into triangles
            if has_ngons and len_face_vert_loc_indicies > 4:

                ngon_face_indices= BPyMesh_ngon(verts_loc, face_vert_loc_indicies)
                faces.extend(
                    [(
                    [face_vert_loc_indicies[ngon[0]], face_vert_loc_indicies[ngon[1]], face_vert_loc_indicies[ngon[2]] ],
                    [face_vert_tex_indicies[ngon[0]], face_vert_tex_indicies[ngon[1]], face_vert_tex_indicies[ngon[2]] ],
                    context_material,
                    context_smooth_group,
                    context_object)
                    for ngon in ngon_face_indices]
                )

                # edges to make fgons
                if CREATE_FGONS:
                    edge_users= {}
                    for ngon in ngon_face_indices:
                        for i in (0,1,2):
                            i1= face_vert_loc_indicies[ngon[i  ]]
                            i2= face_vert_loc_indicies[ngon[i-1]]
                            if i1>i2: i1,i2= i2,i1

                            try:
                                edge_users[i1,i2]+=1
                            except KeyError:
                                edge_users[i1,i2]= 1

                    for key, users in edge_users.items():
                        if users>1:
                            fgon_edges[key]= None

                # remove all after 3, means we dont have to pop this one.
                faces.pop(f_idx)


    # Build sharp edges
    if unique_smooth_groups:
        for edge_dict in list(smooth_group_users.values()):
            for key, users in list(edge_dict.items()):
                if users==1: # This edge is on the boundry of a group
                    sharp_edges[key]= None


    # map the material names to an index
    material_mapping = {name: i for i, name in enumerate(unique_materials)} # enumerate over unique_materials keys()

    materials= [None] * len(unique_materials)

    for name, index in list(material_mapping.items()):
        materials[index]= unique_materials[name]

    me= bpy.data.meshes.new(dataname)

    # make sure the list isnt too big
    for material in materials:
        me.materials.append(material)

    me.vertices.add(len(verts_loc))
    me.faces.add(len(faces))

    # verts_loc is a list of (x, y, z) tuples
    me.vertices.foreach_set("co", unpack_list(verts_loc))

    # faces is a list of (vert_indices, texco_indices, ...) tuples
    # XXX faces should contain either 3 or 4 verts
    # XXX no check for valid face indices
    me.faces.foreach_set("vertices_raw", unpack_face_list([f[0] for f in faces]))

    if verts_tex and me.faces:
        me.uv_textures.new()

    context_material_old= -1 # avoid a dict lookup
    mat= 0 # rare case it may be un-initialized.
    me_faces= me.faces

    for i, face in enumerate(faces):
        if len(face[0]) < 2:
            pass #raise "bad face"
        elif len(face[0])==2:
            if CREATE_EDGES:
                edges.append(face[0])
        else:

                blender_face = me.faces[i]

                face_vert_loc_indicies,\
                face_vert_tex_indicies,\
                context_material,\
                context_smooth_group,\
                context_object= face



                if context_smooth_group:
                    blender_face.use_smooth = True

                if context_material:
                    if context_material_old is not context_material:
                        mat= material_mapping[context_material]
                        context_material_old= context_material

                    blender_face.material_index= mat
#                     blender_face.mat= mat


                if verts_tex:

                    blender_tface= me.uv_textures[0].data[i]

                    if context_material:
                        image, has_data = unique_material_images[context_material]
                        if image: # Can be none if the material dosnt have an image.
                            blender_tface.image = image
                            blender_tface.use_image = True
                            if has_data and image.depth == 32:
                                blender_tface.blend_type = 'ALPHA'

                    # BUG - Evil eekadoodle problem where faces that have vert index 0 location at 3 or 4 are shuffled.
                    if len(face_vert_loc_indicies)==4:
                        if face_vert_loc_indicies[2]==0 or face_vert_loc_indicies[3]==0:
                            face_vert_tex_indicies= face_vert_tex_indicies[2], face_vert_tex_indicies[3], face_vert_tex_indicies[0], face_vert_tex_indicies[1]
                    else: # length of 3
                        if face_vert_loc_indicies[2]==0:
                            face_vert_tex_indicies= face_vert_tex_indicies[1], face_vert_tex_indicies[2], face_vert_tex_indicies[0]
                    # END EEEKADOODLE FIX

                    # assign material, uv's and image
                    blender_tface.uv1= verts_tex[face_vert_tex_indicies[0]]
                    blender_tface.uv2= verts_tex[face_vert_tex_indicies[1]]
                    blender_tface.uv3= verts_tex[face_vert_tex_indicies[2]]

                    if len(face_vert_loc_indicies)==4:
                        blender_tface.uv4= verts_tex[face_vert_tex_indicies[3]]

#                     for ii, uv in enumerate(blender_face.uv):
#                         uv.x, uv.y=  verts_tex[face_vert_tex_indicies[ii]]
    del me_faces
#     del ALPHA

    if CREATE_EDGES and not edges:
        CREATE_EDGES = False

    if CREATE_EDGES:
        me.edges.add(len(edges))

        # edges should be a list of (a, b) tuples
        me.edges.foreach_set("vertices", unpack_list(edges))
#         me_edges.extend( edges )

#     del me_edges

    # Add edge faces.
#     me_edges= me.edges

    def edges_match(e1, e2):
        return (e1[0] == e2[0] and e1[1] == e2[1]) or (e1[0] == e2[1] and e1[1] == e2[0])

    # XXX slow
#     if CREATE_FGONS and fgon_edges:
#         for fgon_edge in fgon_edges.keys():
#             for ed in me.edges:
#                 if edges_match(fgon_edge, ed.vertices):
#                     ed.is_fgon = True

#     if CREATE_FGONS and fgon_edges:
#         FGON= Mesh.EdgeFlags.FGON
#         for ed in me.findEdges( fgon_edges.keys() ):
#             if ed is not None:
#                 me_edges[ed].flag |= FGON
#         del FGON

    # XXX slow
#     if unique_smooth_groups and sharp_edges:
#         for sharp_edge in sharp_edges.keys():
#             for ed in me.edges:
#                 if edges_match(sharp_edge, ed.vertices):
#                     ed.use_edge_sharp = True

#     if unique_smooth_groups and sharp_edges:
#         SHARP= Mesh.EdgeFlags.SHARP
#         for ed in me.findEdges( sharp_edges.keys() ):
#             if ed is not None:
#                 me_edges[ed].flag |= SHARP
#         del SHARP

    me.update(calc_edges=CREATE_EDGES)
#     me.calcNormals()

    ob= bpy.data.objects.new("Mesh", me)
    new_objects.append(ob)

    # Create the vertex groups. No need to have the flag passed here since we test for the
    # content of the vertex_groups. If the user selects to NOT have vertex groups saved then
    # the following test will never run
    for group_name, group_indicies in vertex_groups.items():
        group= ob.vertex_groups.new(group_name)
        ob.vertex_groups.assign(group_indicies, group, 1.0, 'REPLACE')


def create_nurbs(context_nurbs, vert_loc, new_objects):
    '''
    Add nurbs object to blender, only support one type at the moment
    '''
    deg = context_nurbs.get('deg', (3,))
    curv_range = context_nurbs.get('curv_range')
    curv_idx = context_nurbs.get('curv_idx', [])
    parm_u = context_nurbs.get('parm_u', [])
    parm_v = context_nurbs.get('parm_v', [])
    name = context_nurbs.get('name', 'ObjNurb')
    cstype = context_nurbs.get('cstype')

    if cstype is None:
        print('\tWarning, cstype not found')
        return
    if cstype != 'bspline':
        print('\tWarning, cstype is not supported (only bspline)')
        return
    if not curv_idx:
        print('\tWarning, curv argument empty or not set')
        return
    if len(deg) > 1 or parm_v:
        print('\tWarning, surfaces not supported')
        return

    cu = bpy.data.curves.new(name, 'CURVE')
    cu.dimensions = '3D'

    nu = cu.splines.new('NURBS')
    nu.points.add(len(curv_idx) - 1) # a point is added to start with
    nu.points.foreach_set("co", [co_axis for vt_idx in curv_idx for co_axis in (vert_loc[vt_idx] + (1.0,))])

    nu.order_u = deg[0] + 1

    # get for endpoint flag from the weighting
    if curv_range and len(parm_u) > deg[0]+1:
        do_endpoints = True
        for i in range(deg[0]+1):

            if abs(parm_u[i]-curv_range[0]) > 0.0001:
                do_endpoints = False
                break

            if abs(parm_u[-(i+1)]-curv_range[1]) > 0.0001:
                do_endpoints = False
                break

    else:
        do_endpoints = False

    if do_endpoints:
        nu.use_endpoint_u = True


    # close
    '''
    do_closed = False
    if len(parm_u) > deg[0]+1:
        for i in xrange(deg[0]+1):
            #print curv_idx[i], curv_idx[-(i+1)]

            if curv_idx[i]==curv_idx[-(i+1)]:
                do_closed = True
                break

    if do_closed:
        nu.use_cyclic_u = True
    '''
    
    ob= bpy.data.objects.new("Nurb", cu)

    new_objects.append(ob)


def strip_slash(line_split):
    if line_split[-1][-1]== '\\':
        if len(line_split[-1])==1:
            line_split.pop() # remove the \ item
        else:
            line_split[-1]= line_split[-1][:-1] # remove the \ from the end last number
        return True
    return False



def get_float_func(filepath):
    '''
    find the float function for this obj file
    - whether to replace commas or not
    '''
    file= open(filepath, 'rU')
    for line in file: #.xreadlines():
        line = line.lstrip()
        if line.startswith('v'): # vn vt v
            if ',' in line:
                return lambda f: float(f.replace(',', '.'))
            elif '.' in line:
                return float

    # incase all vert values were ints
    return float

def load(operator, context, filepath,
         CLAMP_SIZE= 0.0,
         CREATE_FGONS= True,
         CREATE_SMOOTH_GROUPS= True,
         CREATE_EDGES= True,
         SPLIT_OBJECTS= True,
         SPLIT_GROUPS= True,
         ROTATE_X90= True,
         IMAGE_SEARCH=True,
         POLYGROUPS=False):
    '''
    Called by the user interface or another script.
    load_obj(path) - should give acceptable results.
    This function passes the file and sends the data off
        to be split into objects and then converted into mesh objects
    '''
    print('\nimporting obj %r' % filepath)

    if SPLIT_OBJECTS or SPLIT_GROUPS:
        POLYGROUPS = False

    time_main= time.time()
#     time_main= sys.time()

    verts_loc= []
    verts_tex= []
    faces= [] # tuples of the faces
    material_libs= [] # filanems to material libs this uses
    vertex_groups = {} # when POLYGROUPS is true

    # Get the string to float conversion func for this file- is 'float' for almost all files.
    float_func= get_float_func(filepath)

    # Context variables
    context_material= None
    context_smooth_group= None
    context_object= None
    context_vgroup = None

    # Nurbs
    context_nurbs = {}
    nurbs = []
    context_parm = '' # used by nurbs too but could be used elsewhere

    has_ngons= False
    # has_smoothgroups= False - is explicit with len(unique_smooth_groups) being > 0

    # Until we can use sets
    unique_materials= {}
    unique_material_images= {}
    unique_smooth_groups= {}
    # unique_obects= {} - no use for this variable since the objects are stored in the face.

    # when there are faces that end with \
    # it means they are multiline-
    # since we use xreadline we cant skip to the next line
    # so we need to know whether
    context_multi_line= ''

    print("\tparsing obj file...")
    time_sub= time.time()
#     time_sub= sys.time()

    file= open(filepath, 'rU')
    for line in file: #.xreadlines():
        line = line.lstrip() # rare cases there is white space at the start of the line

        if line.startswith('v '):
            line_split= line.split()
            # rotate X90: (x,-z,y)
            verts_loc.append( (float_func(line_split[1]), -float_func(line_split[3]), float_func(line_split[2])) )

        elif line.startswith('vn '):
            pass

        elif line.startswith('vt '):
            line_split= line.split()
            verts_tex.append( (float_func(line_split[1]), float_func(line_split[2])) )

        # Handel faces lines (as faces) and the second+ lines of fa multiline face here
        # use 'f' not 'f ' because some objs (very rare have 'fo ' for faces)
        elif line.startswith('f') or context_multi_line == 'f':

            if context_multi_line:
                # use face_vert_loc_indicies and face_vert_tex_indicies previously defined and used the obj_face
                line_split= line.split()

            else:
                line_split= line[2:].split()
                face_vert_loc_indicies= []
                face_vert_tex_indicies= []

                # Instance a face
                faces.append((\
                face_vert_loc_indicies,\
                face_vert_tex_indicies,\
                context_material,\
                context_smooth_group,\
                context_object\
                ))

            if strip_slash(line_split):
                context_multi_line = 'f'
            else:
                context_multi_line = ''

            for v in line_split:
                obj_vert= v.split('/')

                vert_loc_index= int(obj_vert[0])-1
                # Add the vertex to the current group
                # *warning*, this wont work for files that have groups defined around verts
                if    POLYGROUPS and context_vgroup:
                    vertex_groups[context_vgroup].append(vert_loc_index)

                # Make relative negative vert indicies absolute
                if vert_loc_index < 0:
                    vert_loc_index= len(verts_loc) + vert_loc_index + 1

                face_vert_loc_indicies.append(vert_loc_index)

                if len(obj_vert)>1 and obj_vert[1]:
                    # formatting for faces with normals and textures us
                    # loc_index/tex_index/nor_index

                    vert_tex_index= int(obj_vert[1])-1
                    # Make relative negative vert indicies absolute
                    if vert_tex_index < 0:
                        vert_tex_index= len(verts_tex) + vert_tex_index + 1

                    face_vert_tex_indicies.append(vert_tex_index)
                else:
                    # dummy
                    face_vert_tex_indicies.append(0)

            if len(face_vert_loc_indicies) > 4:
                has_ngons= True

        elif CREATE_EDGES and (line.startswith('l ') or context_multi_line == 'l'):
            # very similar to the face load function above with some parts removed