Indentation fix: if assigning a material already on the object to a selection of faces in edit mode the script would do nothing

  * On OSX, copy the Python lib folder to sit alongside the .app instead of the Unix executable.

Further Error handling to allow win 32 bits blender builds to render with Povray 64 bits and the other way around.

handle exceptions for reading non XML files - cant decode or parse, real errors in code will still raise exceptions.

line 19
changed bl_addon_info, to bl_info so script shows up in addons menu.

Fixed multiple copies of materials being added, this script now works for metaballs, text, curves etc. Select by material only shows used materials in teh pop up now too.

#ported from original by Michael Williamsn
#
#tested r28370
#
#
# ##### BEGIN GPL LICENSE BLOCK #####
#
#  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
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# ##### END GPL LICENSE BLOCK #####

bl_info = {
    "name": "Material Utils",
    "author": "michaelw",
    "version": (1, 3),
    "blender": (2, 5, 6),
    "api": 35324,
    "location": "View3D > Q key",
    "description": "Menu of material tools (assign, select by etc)  in the 3D View",
    "warning": "",
    "wiki_url": "http://wiki.blender.org/index.php/Extensions:2.5/Py/"\
        "Scripts/3D interaction/Materials Utils",
    "tracker_url": "https://projects.blender.org/tracker/index.php?"\
        "func=detail&aid=22140",
    "category": "3D View"}

"""
This script has several functions and operators... grouped for convenience
* assign material:
    offers the user a list of ALL the materials in the blend file and an additional "new" entry
    the chosen material will be assigned to all the selected objects in object mode.
    
    in edit mode the selected faces get the selected material applied.

    if the user chose "new" the new material can be renamed using the "last operator" section of the toolbox
    After assigning the material "clean material slots" and "material to texface" are auto run to keep things tidy (see description bellow)


* select by material
    in object mode this offers the user a menu of all materials in the blend file
    any objects using the selected material will become selected, any objects without the material will be removed from selection.
    
    in edit mode:  the menu offers only the materials attached to the current object. It will select the faces that use the material and deselect those that do not.

* clean material slots
    for all selected objects any empty material slots or material slots with materials that are not used by the mesh faces will be removed.

* Any un-used materials and slots will be removed 
"""


import bpy
from bpy.props import*


def replace_material(m1 , m2, all_objects = False):
    #replace material named m1 with material named m2
    #m1 is the name of original material
    #m2 is the name of the material to replace it with
    #'all' will replace throughout the blend file
    try:
        matorg = bpy.data.materials[m1]
        matrep = bpy.data.materials[m2]
        
        
        #store active object
        scn = bpy.context.scene
        ob_active = bpy.context.active_object
        
        if all_objects:
            objs = bpy.data.objects
        
        else:
            objs = bpy.context.selected_editable_objects
        
        for ob in objs:
            if ob.type == 'MESH':
                scn.objects.active = ob
                print(ob.name)   
                ms = ob.material_slots.values()
            
                for m in ms:
                    if m.material == matorg:
                        m.material = matrep
                        #don't break the loop as the material can be 
                        # ref'd more than once
        
        #restore active object
        scn.objects.active = ob_active
    except:
        print('no match to replace')

def select_material_by_name(find_mat):
    #in object mode selects all objects with material find_mat
    #in edit mode selects all faces with material find_mat
    
    #check for editmode
    editmode = False

    scn = bpy.context.scene
    
    #set selection mode to faces
    scn.tool_settings.mesh_select_mode =[False,False,True]
    
    actob = bpy.context.active_object
    if actob.mode == 'EDIT':
        editmode =True
        bpy.ops.object.mode_set()
    
    
    if not editmode:
        objs = bpy.data.objects 
        for ob in objs:
            typ = ['MESH','CURVE', 'SURFACE', 'FONT', 'META']
            if ob.type in typ:
                ms = ob.material_slots.values()
                for m in ms:
                    if m.material.name == find_mat:
                        ob.select = True
                        #the active object may not have the mat!
                        #set it to one that does!
                        scn.objects.active = ob
                        break
                    else:
                        ob.select = False
                            
            #deselect non-meshes                
            else:
                ob.select = False
    
    else:
        #it's editmode, so select the faces
        ob = actob
        ms = ob.material_slots.values()
    
        #same material can be on multiple slots
        slot_indeces =[]
        i = 0
        found = False
        for m in ms:
            if m.material.name == find_mat:
                slot_indeces.append(i)
                found = True
            i += 1
        me = ob.data
        for f in me.faces:
            if f.material_index in slot_indeces:
                f.select = True
            else:
                f.select = False
        me.update()   
    if editmode:
        bpy.ops.object.mode_set(mode = 'EDIT')

def mat_to_texface():
    #assigns the first image in each material to the faces in the active uvlayer
    #for all selected objects
    
    #check for editmode
    editmode = False
    
    actob = bpy.context.active_object
    if actob.mode == 'EDIT':
        editmode =True
        bpy.ops.object.mode_set()
    
    for ob in bpy.context.selected_editable_objects:
        if ob.type == 'MESH':
            #get the materials from slots
            ms = ob.material_slots.values()
            
            #build a list of images, one per material
            images=[]
            #get the textures from the mats
            for m in ms:
                gotimage = False
                textures = m.material.texture_slots.values()
                if len(textures) >= 1:
                    for t in textures:
                        if t != None:
                            tex = t.texture
                            if tex.type == 'IMAGE':
                                img = tex.image
                                images.append(img)
                                gotimage =True
                                break
        
                if not gotimage:
                    print('noimage on', m.name)
                    images.append(None)
        
            #now we have the images
            #applythem to the uvlayer
        
            
            me = ob.data
            #got uvs?
            if not me.uv_textures:
                scn = bpy.context.scene
                scn.objects.active = ob
                bpy.ops.mesh.uv_texture_add()
                scn.objects.active = actob
            
            #get active uvlayer
            for t in  me.uv_textures:
                if t.active:
                    uvtex = t.data.values()
                    for f in me.faces:
                        #check that material had an image!
                        if images[f.material_index] != None:
                            uvtex[f.index].image = images[f.material_index]
                            uvtex[f.index].use_image = True
                        else:
                            uvtex[f.index].use_image = False
    
            me.update()
        
    
    if editmode:
        bpy.ops.object.mode_set(mode = 'EDIT')
                    
        

def assignmatslots(ob, matlist):
    #given an object and a list of material names
    #removes all material slots form the object
    #adds new ones for each material in matlist
    #adds the materials to the slots as well.

    scn = bpy.context.scene
    ob_active = bpy.context.active_object
    scn.objects.active = ob

    for s in ob.material_slots:
        bpy.ops.object.material_slot_remove()


    #re-add them and assign material
    i = 0
    for m in matlist:
        mat = bpy.data.materials[m]
        ob.data.materials.append(mat)
        i += 1

    #restore active object:
    scn.objects.active = ob_active


def cleanmatslots():
    #check for edit mode
    editmode = False
    actob = bpy.context.active_object
    if actob.mode == 'EDIT':
        editmode =True
        bpy.ops.object.mode_set()


    objs = bpy.context.selected_editable_objects
    
    for ob in objs:
        if ob.type == 'MESH':
            mats = ob.material_slots.keys()
        
            #check the faces on the mesh to build a list of used materials
            usedMatIndex =[]        #we'll store used materials indices here
            faceMats =[]    
            me = ob.data
            for f in me.faces:
                #get the material index for this face...
                faceindex = f.material_index
                        
                #indices will be lost: Store face mat use by name
                currentfacemat = mats[faceindex]
                faceMats.append(currentfacemat)
                        
                        
                #check if index is already listed as used or not
                found = 0
                for m in usedMatIndex:
                    if m == faceindex:
                        found = 1
                        #break
                            
                if found == 0:
                #add this index to the list     
                    usedMatIndex.append(faceindex)
        
            #re-assign the used mats to the mesh and leave out the unused
            ml = []
            mnames = []
            for u in usedMatIndex:
                ml.append( mats[u] )
                #we'll need a list of names to get the face indices...
                mnames.append(mats[u])
                        
            assignmatslots(ob, ml)
            
                    
            #restore face indices:
            i = 0
            for f in me.faces:
                matindex = mnames.index(faceMats[i])
                f.material_index = matindex
                i += 1

    if editmode:
        bpy.ops.object.mode_set(mode = 'EDIT')





def assign_mat(matname="Default"): 
    #get active object so we can restore it later
    actob = bpy.context.active_object
    
    #check if material exists, if it doesn't then create it
    mats =bpy.data.materials
    found = False
    for m in mats:
        if m.name == matname:
            target = m
            found = True
            break
    if not found:
        target = bpy.data.materials.new(matname)
    
    
    #if objectmode then set all faces
    editmode = False
    allfaces = True
    if actob.mode == 'EDIT':
        editmode =True
        allfaces = False    
        bpy.ops.object.mode_set()
    
    objs = bpy.context.selected_editable_objects
    
    for ob in objs:    
        #set the active object to our object
        scn = bpy.context.scene
        scn.objects.active = ob
        
    
        other = ['CURVE', 'SURFACE', 'FONT', 'META']
        if ob.type in other:
            found=False
            i = 0
            mats = bpy.data.materials
            for m in mats:
                if m.name == matname:
                    found =True
                    index = i
                    break
                i += 1
                if not found:
                    index = i-1
            targetlist =[index]
            assignmatslots(ob, targetlist)
            
        elif ob.type =='MESH':
            #check material slots for matname material
            found=False
            i = 0
            mats = ob.material_slots
            for m in mats:
                if m.name == matname:
                    found =True
                    index = i
                    #make slot active
                    ob.active_material_index = i
                    break
                i += 1
            
            if not found:
                index=i
                #the material is not attached to the object 
                ob.data.materials.append(target)    
                
            #now assign the material:
                me =ob.data
                if allfaces:
                    for f in me.faces:
                        f.material_index = index
                elif allfaces == False:
                    for f in me.faces:
                        if f.select:
                            f.material_index = index
                me.update()
            


    #restore the active object
    bpy.context.scene.objects.active = actob
    if editmode:
        bpy.ops.object.mode_set(mode = 'EDIT')



def check_texture(img,mat):
    #finds a texture from an image
    #makes a texture if needed
    #adds it to the material if it isn't there already

    tex = bpy.data.textures.get(img.name)

    if tex is None:
        tex = bpy.data.textures.new(name=img.name, type='IMAGE')

    tex.image = img

    #see if the material already uses this tex
    #add it if needed
    found = False
    for m in mat.texture_slots:
        if m and m.texture == tex:
            found = True
            break
    if not found and mat:
        mtex = mat.texture_slots.add()
        mtex.texture = tex
        mtex.texture_coords = 'UV'
        mtex.use_map_color_diffuse = True

def texface_to_mat():
    # editmode check here!
    editmode = False
    ob = bpy.context.object
    if ob.mode =='EDIT':
        editmode = True
        bpy.ops.object.mode_set()

    for ob in bpy.context.selected_editable_objects:

        faceindex = []
        unique_images = []
        
        # get the texface images and store indices
        if (ob.data.uv_textures):
            for f in ob.data.uv_textures.active.data:
                if f.image: 
                    img = f.image
                    #build list of unique images
                    if img not in unique_images:
                        unique_images.append(img)
                    faceindex.append(unique_images.index(img))

                else:
                    img = None
                    faceindex.append(None)   
      
        

        #check materials for images exist; create if needed
        matlist = []
        for i in unique_images:
            if i:
                print(i.name)
                try:
                    m = bpy.data.materials[i.name]
    
                except:
                    m = bpy.data.materials.new(name = i.name)
                    continue

                finally:
                    matlist.append(m.name)
                    # add textures if needed
                    check_texture(i,m)

        #set up the object material slots
        assignmatslots(ob, matlist)
        
        #set texface indices to material slot indices..
        me = ob.data

        i = 0
        for f in faceindex:
            if f != None:
                me.faces[i].material_index = f
            i += 1
    if editmode:
        bpy.ops.object.mode_set(mode = 'EDIT')


#operator classes:
#---------------------------------------------------------------------

class VIEW3D_OT_texface_to_material(bpy.types.Operator):
    ''''''
    bl_idname = "view3d.texface_to_material"
    bl_label = "MW Texface Images to Material/Texture"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        return context.active_object != None

    def execute(self, context):
        if context.selected_editable_objects:
            texface_to_mat()
            return {'FINISHED'}
        else:
            self.report({'WARNING'}, "No editable selected objects, could not finish")
            return {'CANCELLED'}

class VIEW3D_OT_assign_material(bpy.types.Operator):
    '''assign a material to the selection'''
    bl_idname = "view3d.assign_material"
    bl_label = "MW Assign Material"
    bl_options = {'REGISTER', 'UNDO'}

    matname = StringProperty(name = 'Material Name', 
        description = 'Name of Material to Assign', 
        default = "", maxlen = 21)
    
    @classmethod
    def poll(cls, context):
        return context.active_object != None

    def execute(self, context):
        mn = self.matname
        print(mn)
        assign_mat(mn)
        cleanmatslots()
        mat_to_texface()
        return {'FINISHED'}

class VIEW3D_OT_clean_material_slots(bpy.types.Operator):
    '''removes any material slots from the 
    selected objects that are not used by the mesh'''
    bl_idname = "view3d.clean_material_slots"
    bl_label = "MW Clean Material Slots"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        return context.active_object != None

    def execute(self, context):
        cleanmatslots()
        return {'FINISHED'}

class VIEW3D_OT_material_to_texface(bpy.types.Operator):
    ''''''
    bl_idname = "view3d.material_to_texface"
    bl_label = "MW Material Images to Texface"
    bl_options = {'REGISTER', 'UNDO'}

    @classmethod
    def poll(cls, context):
        return context.active_object != None

    def execute(self, context):
        mat_to_texface()
        return {'FINISHED'}

class VIEW3D_OT_select_material_by_name(bpy.types.Operator):
    ''''''
    bl_idname = "view3d.select_material_by_name"
    bl_label = "MW Select Material By Name"
    bl_options = {'REGISTER', 'UNDO'}
    matname = StringProperty(name = 'Material Name', 
        description = 'Name of Material to Select', 
        default = "", maxlen = 21)

    @classmethod
    def poll(cls, context):
        return context.active_object != None

    def execute(self, context):
        mn = self.matname
        select_material_by_name(mn)
        return {'FINISHED'}


class VIEW3D_OT_replace_material(bpy.types.Operator):
    '''assign a material to the selection'''
    bl_idname = "view3d.replace_material"
    bl_label = "MW Replace Material"
    bl_options = {'REGISTER', 'UNDO'}

    matorg = StringProperty(name = 'Material to Replace', 
        description = 'Name of Material to Assign', 
        default = "", maxlen = 21)

    matrep = StringProperty(name = 'Replacement material', 
        description = 'Name of Material to Assign', 
        default = "", maxlen = 21)

    all_objects = BoolProperty(name ='all_objects',
        description="replace for all objects in this blend file",
        default = True)
    
    @classmethod
    def poll(cls, context):
        return context.active_object != None

    def execute(self, context):
        m1 = self.matorg
        m2 = self.matrep
        all = self.all_objects
        replace_material(m1,m2,all)
        return {'FINISHED'}

#menu classes
#-------------------------------------------------------------------------------
class VIEW3D_MT_master_material(bpy.types.Menu):
    bl_label = "Master Material Menu"

    def draw(self, context):
        layout = self.layout
        layout.operator_context = 'INVOKE_REGION_WIN'

        layout.menu("VIEW3D_MT_assign_material", icon='ZOOMIN')
        layout.menu("VIEW3D_MT_select_material", icon='HAND')
        layout.separator()
        layout.operator("view3d.clean_material_slots", 
            text = 'Clean Material Slots', icon='CANCEL')
        layout.operator("view3d.material_to_texface",
            text = 'Material to Texface',icon='FACESEL_HLT')
        layout.operator("view3d.texface_to_material",
            text = 'Texface to Material',icon='FACESEL_HLT')

        layout.separator()
        layout.operator("view3d.replace_material", 
            text = 'Replace Material', icon='ARROW_LEFTRIGHT')
       


class VIEW3D_MT_assign_material(bpy.types.Menu):
    bl_label = "Assign Material"

    def draw(self, context):
        layout = self.layout
        layout.operator_context = 'INVOKE_REGION_WIN'

        ob = context
        layout.label
        for i in range (len(bpy.data.materials)):
    
            layout.operator("view3d.assign_material",
                text=bpy.data.materials[i].name, 
                icon='MATERIAL_DATA').matname = bpy.data.materials[i].name

        layout.operator("view3d.assign_material",text="Add New", 
                icon='ZOOMIN')

class VIEW3D_MT_select_material(bpy.types.Menu):
    bl_label = "Select by Material"

    def draw(self, context):
        layout = self.layout
        layout.operator_context = 'INVOKE_REGION_WIN'

        ob = context.object
        layout.label
        if ob.mode == 'OBJECT':
            #show all used materials in entire blend file
            for i in range (len(bpy.data.materials)):
                if bpy.data.materials[i].users > 0:
                    layout.operator("view3d.select_material_by_name",
                        text=bpy.data.materials[i].name, 
                        icon='MATERIAL_DATA').matname = bpy.data.materials[i].name


        elif ob.mode == 'EDIT':
            #show only the materials on this object
            mats = ob.material_slots.keys()
            for m in mats:
                layout.operator("view3d.select_material_by_name",
                    text=m, 
                    icon='MATERIAL_DATA').matname = m


def register():
    bpy.utils.register_module(__name__)
    
    kc = bpy.data.window_managers[0].keyconfigs.default
    km = kc.keymaps.get("3D View")
    if km is None:
        km = kc.keymaps.new(name="3D View")

    kmi = km.items.new('wm.call_menu', 'Q', 'PRESS')
    kmi.properties.name = "VIEW3D_MT_master_material"

def unregister():
    bpy.utils.unregister_module(__name__)

    kc = bpy.data.window_managers[0].keyconfigs.default
    km = kc.keymaps["3D View"]
    for kmi in km.items:
        if kmi.idname == 'wm.call_menu':
            if kmi.properties.name ==  "VIEW3D_MT_master_material":
                km.items.remove(kmi)
                break

if __name__ == "__main__":
    register()

An update over surface sketching, allowing object level transformations, Undo, and solving some problems like a mesh duplication that was taking place when there were no strokes, and eliminating a remove doubles that was performed in the whole mesh, now limiting it to just the areas where it's needed to merge the new surface.

No commit message

little better tooltip for rotobezier keyframing buttons. People seem to think they need to select CVs before inserting keyframes and that isn't really nessesary

Fixes for api changes.
Max value of scroll isn't updated anymore, needs property callbacks to make it work again.

- added next/previous buttons so you can skip demos.

* Moved property definitions to registration function.
* Changed automatic callback adding to manual, the current API doesn't seem to allow this top be automatically yet.

work in progress addon: demo mode, use for easy setup for looping over blend files, rendering, playing, switching screens.

removed warning, api r35853
quick fix for error.
line 519 commented out > # bpy.ops.object.location_apply()

added "warning": "Script returns errors"
api r35853