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).
Shell or boundary – These models represent the surface, i.e.
Solid models are mostly used for engineering and medical simulations, and are usually built with constructive solid geometry
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