Mofei SongZhengxing SunFeiqian ZhangThomas Funkhouser and Shi-Min Hu2015-06-052015-06-052014--https://doi.org/10.2312/sgp20141381The detailed 3D environment becomes an essential way for offering the richest user experience in the digital entertainment or virtual reality application. Model synthesis [Mer07,MM08,MM09,MM11] is one of the effective methods to create 3D complex shapes from an example. Compared with other methods, this method can realize multidirectional extending easily. Besides, it is a general-purpose modeling tool, which can accept many different example models. One problem of prior work in model synthesis is that it can only extend example models on the regular grid structure. It is inefficient when people need to create some non-parallel or curved structures, which are more popular in the real world. To solve it, we extend the previous adjacent constraint by relaxing the boundary matching constraint, and the constraint is called generalized adjacent constraint. Through a boundary consistency analysis, more adjacent relation can be found to support synthesis on the irregular structure. Then an optimization framework is introduced to refine the synthesis result by maximizing an energy function.