About Regions
Regions are 2D enclosed areas that have physical properties such as centroids or centers of mass. You can combine existing regions into a single, complex region.
Regions can be used for:
- Extracting design information
- Applying hatching and shading
- Combining simple objects into more complex ones with Boolean operations.
You can create regions from objects that from close loops. Loops can be combinations of lines, polylines, circles, arcs, ellipses, elliptical arcs, and splines that enclose an area.
You can create regions by unifying, subtracting, or intersecting them:
Object combined using UNION:
Objects combined using SUBTRACT:
Objects combined using INTERSECT:
Invalid Boundaries
When a boundary cannot be determined, it might be because the specified internal point is not within a fully enclosed area. In the example below, red circles are displayed around unconnected endpoints to identify gaps in the boundary.
Related Articles
SUBTRACT Command
Creates as a new object by subtracting one overlapping region or 3D solid from another. With SUBTRACT, you can create a 3D solid by subtracting one set of existing 3D solids from another, overlapping set. You can create a 2D region object by ...About Finding Area and Mass Properties Information
You can obtain the area, perimeter, and mass properties of selected objects or from a sequence of points. Use Commands to Calculate Area With the MEASUREGEOM and AREA commands, you can specify a series of points or select an object to find the ...EXPLODE Command
Breaks a compound object into its component objects. Explodes a compound object when you want to modify its components separately. Objects that can be exploded include blocks, polylines, and regions, among others. The color, linetype, and ...HIDE Command
Displays a 3D model with hidden lines suppressed for the 2D Wireframe visual style. Objects that can hide other objects include circles, solids, text, regions, wide polyline segments, 3D solids, 3D surfaces, 3D meshes, and the extruded edges of ...REVOLVE Command
Creates a 3D solid or surface by sweeping an object around an axis. Open profiles create surfaces and closed profiles can create either a solid or a surface. The Mode option controls whether a solid or a surface is created. When creating a surface, ...
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