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An imposter model maps all geometric details as textures and can be used if a model will be viewed from a distance and a certain direction. Occlusion mesh. An occlusion mesh process generates a silhouette based geometry that removes internal features and concavities.
If that polygon lies in the plane containing P, add it to the list of polygons at node N. Apply this algorithm to the list of polygons in front of P. Apply this algorithm to the list of polygons behind P. The following diagram illustrates the use of this algorithm in converting a list of lines or polygons into a BSP tree.
The EREW model is the PRAM variant closest to real machines. The hidden-line algorithm does O ( n 2 log n ) work, which is the upper bound for the best sequential algorithms used in practice. Cook, Dwork and Reischuk gave an Ω(log n ) lower bound for finding the maximum of n integers allowing infinitely many processors of any PRAM without ...
In 3D computer graphics, hidden-surface determination (also known as shown-surface determination, hidden-surface removal (HSR), occlusion culling (OC) or visible-surface determination (VSD)) is the process of identifying what surfaces and parts of surfaces can be seen from a particular viewing angle.
In scanline conversion, each polygon must be converted and displayed, regardless of size, and there are frequently a large number of models on the screen at any given time. Often, programmers must use multiple models at varying levels of detail to represent the same object in order to cut down on the number of polygons being rendered.
Simple solutions are preferred to ensure that the resulting model is easy to edit. Solving this problem is a challenge because of the large search space that has to be explored. It combines continuous parameters such as dimension and size of the primitive shapes, and discrete parameters such as the Boolean operators used to build the final CSG ...
All of the polygons to be rendered are first sorted by the top y coordinate at which they first appear, then each row or scan line of the image is computed using the intersection of a scanline with the polygons on the front of the sorted list, while the sorted list is updated to discard no-longer-visible polygons as the active scan line is ...
Modern computed axial tomography and magnetic resonance imaging scanners can be used to create solid models of internal body features called voxel-based models, with images generated using volume rendering. Optical 3D scanners can be used to create point clouds or polygon mesh models of external body features. Uses of medical solid modeling;