CG pavilion > photo matching (exteriors). The photo matching process was the fundamental test to validate the CG pavilion model. Given a photo, we identified the location in the virtual environment with a view coincident with the photo. In these composed photos the directrices of the ruled surface walls are colored for pointing out the matching results (compare them with the original photos here). One can notice the matching failure in the case of the color postcard, probably due to unknown lenses used in that case (a typical process of postcard making). Similar photo matching process for the interiors.