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the presence of an optically thick dust torus is the cornerstone of unification schemes for agn to explain the orientation - dependent difference between type 1 and type 2 objects .
the dust inside the torus absorbes the agn radiation and reemits it in the infrared . for the nucleus of ngc  1068
, interferometric observations directly resolved the torus in the nir and mir ( e.g. , * ? ? ?
* ; * ? ? ?
the interferometric data support the idea that the dust within the torus is concentrated in clumps instead of homogeneously distributed @xcite .
recently , we presented our new 3-dimensional radiative transfer calculations of clumpy dust tori ( for more details , see * ? ? ? * ) .
the torus modeling makes use of a database of dust cloud seds simulated with our monte carlo radiative transfer code . for each set of model parameters , we simulate torus seds for different random arrangement of clouds .
our torus model was applied to the seyfert 2 agn ngc  1068 @xcite . here , we present new results with some improvement to the earlier publication .
we simultaneously modeled nir and mir photometry as well as nir and mir interferometric data of the nucleus . in fig .
[ n1068sed ] we show a comparison between the observed high - resolution sed and our model sed .
important model parameters are the agn luminosity @xmath2 , torus inclination @xmath1 , and optical depth of the torus @xmath3 .
why do we need clumpiness in the torus ?
@xcite theoretically argue that homogeneously distributed dust can not survive in the environment of an agn .
this has been supported by mir spectro - interferometric observations of ngc  1068 which find deeper silicate features with growing baseline @xcite .
this is apparently inconsistent with homogeneously distributed dust @xcite .
in addition , nir long - baseline interferometry of ngc  1068 finds a surprisingly high visibility at a baseline of 46 m which can not be explained by a simple homogeneous model @xcite . in figs .
[ n1068sed ] & [ n1068mi ] , we show that our clumpy torus model is able to reproduce the interferometric results .
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we present 3-dimensional radiative transfer models for clumpy dust tori around agn . 
 our method combines monte carlo simulations of individual dust clouds with the actual 3-dimensional distribution of clouds in the torus . 
 the model has been applied to nir and mir photometric and interferometric observations of ngc  1068 . for the first time 
 , it is possible to simultaneously reproduce both photometric and interferometric observations in the nir and mir . 
 we infer a luminosity @xmath0 and an inclination of @xmath1 for ngc  1068 from our model .