Figure 1: This figure shows the application of CGA shape, a novel shape grammar for the procedural modeling of computer graphics architecture. First, the grammar generates procedural variations of the building mass model using volumetric shapes and then proceeds to create façade detail consistent with the mass model. Context sensitive rules ensure that entities like windows or doors do not intersect with other walls, that doors give out on terraces or the street level, that terraces are bounded by railings, etc.
AbstractCGA shape, a novel shape grammar for the procedural modeling of CG architecture, produces building shells with high visual quality and geometric detail. It produces extensive architectural models for computer games and movies, at low cost. Context sensitive shape rules allow the user to specify interactions between the entities of the hierarchical shape descriptions. Selected examples demonstrate solutions to previously unsolved modeling problems, especially to consistent mass modeling with volumetric shapes of arbitrary orientation. CGA shape is shown to efficiently generate massive urban models with unprecedented level of detail, with the virtual rebuilding of the archaeological site of Pompeii as a case in point.