Inverse building modeling. An example of inverse building modeling of known rules but unknown parameter values. (a) One of several input photographs. (b) Manually labeled building model from which rule application and parameter values are automatically inferred. (c) Regeneration of the same initial building model. (d) Generation of a different building in the same style. (e) Nonphotorealistic rendering possible by altering only the terminal symbols of the inferred procedural model (image from [10]).