Редактирование: Polygonal model

Mosaic, or facetted, models simulate 3D surfaces by approximating their geometry form with a set of flat polygonals (most often, triangles). Mosaic models of a general surface are used for:

<ul>	Realistic visulaisation of a surface (body) on a computer screen (taking into account perspective, removing invisible faces that reflect material properties, overlapping of shadows from the sources of light)</ul>
<ul>	Presenting 3D data in a neutral format to use in any application (including machine tools for rapid prototyping and fabrication)</ul>
<ul>	Calculating other mash model representations (mash for finite element method, tetragonal  basic mesh for subdivisional surfaces)</ul>
<ul>	Quick definition of collusions between solid bodies</ul>

Mosaic models consist of a set of flat faces, each of which has it own normal line (to distinguish internal and external surface sides) and node coordinates. Mosaic models are superficial – they do not contain information on the volume and solid bodies.

[[Category: Terms and Concepts]]