The Sydney Opera House presents a number of challenges to any image-based modelling package, but the most significant is probably the fact that the ‘sails’ are complex curves with practically no texture. This makes it very difficult for automated methods to identify the shape accurately. The user interaction in VideoTrace overcomes this problem, however, as the user is able to provide the missing shape information.
The 3D model generated by VideoTrace looks like this:
and the modelling process is