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    # ##### 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 #####
    
    # <pep8 compliant>
    
    bl_addon_info = {
        "name": "Clay Render",
        "author": "Fabio Russo <ruesp83@libero.it>",
        "version": (0, 5),
        "blender": (2, 5, 5),
        "location": "Render > Clay Render",
        "description": "This script, applies a temporary material to all objects"\
    
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            " of the scene.",
    
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        "wiki_url": "http://wiki.blender.org/index.php/Extensions:2.5/Py/"\
            "Scripts/Clay_Render",
        "tracker_url": "https://projects.blender.org/tracker/index.php?"\
            "func=detail&aid=22971&group_id=153&atid=467",
        "category": "Render"}
    
    import bpy
    
    from bpy.props import BoolProperty
    
    
    bpy.types.Scene.Clay = BoolProperty(
        name='Clay Render',
        description='Use Clay Render',
        default=False)
    
    
    def search():
        mats = bpy.data.materials
        Find = False
        id = None
        for m in mats:
            if m.name == "Clay_Render":
                id = m
                Find = True
                break
        return id
    
    
    def create_mat():
        id = search()
        if id == None:
            id = bpy.data.materials.new("Clay_Render")
            #diffuse
            id.diffuse_shader = "OREN_NAYAR"
            id.diffuse_color = 0.800, 0.741, 0.536
            id.diffuse_intensity = 1
            id.roughness = 0.909
            #specular
            id.specular_shader = "COOKTORR"
            id.specular_color = 1, 1, 1
            id.specular_hardness = 10
            id.specular_intensity = 0.115
    
    
    def draw_clay(self, context):
            layout = self.layout
            sd = context.scene
            rnd = context.scene.render
            rnl = rnd.layers.active
    
            create_mat()
    
            split = layout.split()
            col = split.column()
    
            col.prop(sd, "Clay",)
    
            col = split.column()
    
            id = search()
            col.prop(id, "diffuse_color", text="")
            self.layout.separator()
            App_Clay = context.scene.Clay
            if App_Clay:
                rnl.material_override = id
                col.active = True
            else:
                rnl.material_override = None
                col.active = False
    
    
    def register():
        bpy.types.RENDER_PT_render.prepend(draw_clay)
        pass
    
    
    def unregister():
        rnd = bpy.context.scene.render
        rnl = rnd.layers.active
        rnl.material_override = None
        bpy.types.RENDER_PT_render.remove(draw_clay)
        pass
    
    if __name__ == "__main__":
        register()