Geometry Objects Definitions

A 2D or 3D model is created using the following building blocks:

 • Regions: A region may contain either a polygon or circle. Material properties are applied to regions.

 • Basic geometric building blocks may include closed polygons. Only contain x and y coordinates. In 3D, polygons extrude vertically through surfaces to define specific model blocks. Only one polygon or circle can be placed in a region.

 • Basic geometric building blocks may include circles. Only contain x and y coordinates as well as the circle radius. In 3D, circle extrude vertically through surfaces to define specific model blocks. Only one polygon or circle can be placed in a region.

 • Basic building blocks of a 3D numerical model. 3D models are defined by a series of stacking surfaces. Each surface may be specified by a grid, an expression, or a constant. Specific modeling "blocks" are defined by the projection of region polygons/circles onto surfaces. Each surface grid may be formed of regular or irregular lines in the X or Y directions. Surface grids in a single model do not have to consist of identical grid intersection points, however, if there are complex pinch-outs between surfaces it helps to have matching surface grids as mesh generation errors will be minimized.