CRISTAL: 3-D Graphics The use of 3-D computer models provides the means to dynamically examine a building in the context of its site from various perspectives. The 3-D construct enables the system user to move around and through the simulated structure (computer model). Colors and textures can be applied to the surfaces of the computer model by using image processing techniques. This surface mapping enhances the realistic appearance of the representational form. Computer models, such as those created by the "Three-dimensional Object Processing and Animation Software" (TOPAS) from AT&T Graphic Software Labs, also allow the impact of contemporary maintenance activities, design proposals, and management strategies to be graphically simulated. The 3-D computer model of the building, as an independent entity in the resource database, can be used to produce accurate design development or production drawings (ie. elevations, plans, sections, etc.). These models and drawings can serve as a basis for design development, project presentation and review, marketing, and maintenance management. CRISTAL: Graphic Output CRISTAL: Dimensional Analysis