Browsing by Subject "Geometric Modeling"
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Item Scales and Scale-like Structures(2011-08-08) Landreneau, Eric BenjaminScales are a visually striking feature that grows on many animals. These small, rigid plates embedded in the skin form an integral part of our description of ?sh and reptiles, some plants, and many extinct animals. Scales exist in many shapes and sizes, and serve as protection, camou?age, and plumage for animals. The variety of scales and the animals they grow from pose an interesting problem in the ?eld of Computer Graphics. This dissertation presents a method for generating scales and scale-like structures on a polygonal mesh through surface replacement. A triangular mesh was covered with scales and one or more proxy-models were used as the scales shape. A user began scale generation by drawing a lateral line on the model to control the distribution and orientation of scales on the surface. Next, a vector ?eld was created over the surface to control an anisotropic Voronoi tessellation, which represents the region occupied by each scale. Then these regions were replaced by cutting the proxy model to match the boundary of the Voronoi region and deform the cut model onto the surface. The ?nal result is a fully connected 2-manifold that is suitable for subsequent post-processing applications, like surface subdivision.Item Wire and column modeling(Texas A&M University, 2004-09-30) Mandal, EsanThe goal of this thesis is to introduce new methods to create intricate perforated shapes in a computing environment. Modeling shapes with a large number of holes and handles, while requiring minimal human interaction, is an unsolved research problem in computer graphics. In this thesis, we have developed two methods for interactively modeling such shapes. Both methods developed create perforated shapes by building a framework of tube like elements, such that each edge of a given mesh is replaced by a pipe. The first method called Wire modeling replaces each edge with a pipe that has a square cross-section. The result looks like a shape that is created by a framework of matchsticks. The second method, called Column modeling allows more rounded cross-sections for the pipes. The cross-sections can be any uniform polygon, and the users are able to control the number of the segments in the cross-section. These methods are implemented as an extension to an existing modeling system guaranteeing that the pipes are connected and the resulting shape can be physically constructed. Our methods require an initial input mesh that can either be imported from a commercially available software package, or created directly in this modeling system. The system also allows the users to export the models in obj file format, so that the models can be animated and rendered in other software packages.