__author__ = 'thoth'

#
# alter the list of layers that are part of the scene to match the layers that are active in all the RenderLayers
#

import bpy

def set_scene_layers_from_render_layers(scn = bpy.context.scene):
    layers = [ False for i in range(len(scn.layers))]
    for l in scn.render.layers:
        for i in range(len(layers)):
            if l.layers[i]:
                layers[i] = True
    scn.layers = layers


def explode_if_layers_wrong(scn = bpy.context.scene):

    for l in scn.render.layers:
        for i in range(len(scn.layers)):
            if l.layers[i] and not scn.layers[i]:
                raise BaseException("scene layers missing %d used by %s"%(i, l.name))


if __name__ == "__main__":
    bpy.app.handlers.render_pre.append(explode_if_layers_wrong)
#    bpy.app.handlers.render_pre.append(set_scene_layers_from_render_layers)

print(__name__)