maya + python: mental ray nodes

# set up ambient occlusion for mental ray
material = shadingNode('mib_illum_lambert', asShader=True)
texture = shadingNode('mib_amb_occlusion', asShader=True)
connectAttr(texture + '.outValue', material + '.ambient', f=True );

# set up shading group, connect material to this group and apply group to cube object
group = 'mibMaterialGroup'
sets( name=group, renderable=True, empty=True )
connectAttr( material+".outValue", group+".miMaterialShader", force=True)
sets( cube, e=True, forceElement=group )
setAttr(material+".ambience", 0.5, 0.5, 0.5, type='double3' ) ;
setAttr(material+".diffuse" , 0.5, 0.5, 0.5, type='double3' ) ;