![]() ![]() Level sets are a useful representation for deforming surfaces which undergo many topological changes such as fluids. Polygonal meshes (and to a lesser extent subdivision surfaces) are by far the most common representation. In a shell model of a cube, the bottom and top surface of the cube must have a uniform thickness with no holes or cracks in the first and last layer printed. Shell models must be manifold (having no holes or cracks in the shell) to be meaningful as a real object. Differences between them are mostly variations in the way they are created and edited and conventions of use in various fields and differences in types of approximations between the model and reality. Solid and shell modeling can create functionally identical objects. Almost all visual models used in games and film are shell models. the boundary of the object, not its volume (like an infinitesimally thin eggshell). ![]()
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