# Graphics Mesh and Mesh BREP Bodies

Mesh BREP (boundary representation) bodies and graphics mesh bodies are made up of triangular polygons, called facets. Each facet has three vertices and three edges, referred to as fins.

The facets of a mesh BREP body can be collected into faces. These faces are similar to the faces in standard SOLIDWORKS BREP bodies, except that mesh faces do not have a geometric description. For example, the facets of a mesh face can make up a rectangle, but that face is defined simply as a collection of facets, not as rectangle with a height and width.

## Body Types Created from Mesh

- Standard SOLIDWORKS BREP bodies
- Mesh BREP bodies
- Graphics bodies

SOLIDWORKS BREP bodies are the standard bodies used in the SOLIDWORKS software. They can be solid or surface bodies. They do not include mesh surfaces. Every point on a face of these bodies can be determined with a mathematical equation.

Mesh BREP bodies can be solid or surface bodies. The bodies are made up of mesh facets. The facets can be grouped into faces. Facets can form a geometric shape such as a rectangle, and the rectangle can have a BREP face associated with it, but not every point on every face can be determined with a mathematical equation.

Graphics bodies are defined entirely by their facets, without reference to equations. For example, what appears to be a circle in a graphics body is actually a large number of triangles, some of whose edges approximate the circumference of a circle. These mesh edges do not actually form a mathematical curve.

Hybrid solid or surface bodies include mesh BREP geometry and standard SOLIDWORKS BREP geometry in the same model. In general, you create hybrid mesh bodies by adding SOLIDWORKS features to mesh BREP bodies. The faces and edges created by the SOLIDWORKS features contain as much SW standard BREP geometry as possible, instead of mesh BREP geometry.

## Geometry Elements

Facets | Triangular faces of each unit of the mesh | |

Facet Edges | Edges or fins of the mesh facets | |

Facet Vertices | Vertices of mesh facets | |

BREP Faces | Faces comprised of mesh facets | |

Edges | Boundaries of mesh | |

BREP Vertices | Vertices of the edges of mesh BREP faces |

The edges of mesh BREP bodies may approximate mathematical curves, but do not have any geometric attributes. Hybrid mesh bodies can contain a continuous face where one region of the face is mesh BREP geometry, and the other region of the face is standard BREP geometry. A continuous edge is one region comprised of facet fins that form a mesh BREP edge and a standard BREP edge. These are not new geometry types, but rather combinations of existing geometry types in a hybrid mesh body.

Contents

**Creating Hybrid Models**

You can create a hybrid solid or surface body that includes mesh BREP geometry and standard SOLIDWORKS BREP geometry.

**Workflows for Working with Mesh BREP Bodies**

**Options for Importing Mesh Files**

Several system options are available for importing mesh files and converting them to mesh BREP bodies. You can create a hybrid solid or surface body that includes mesh BREP geometry and standard SOLIDWORKS BREP geometry.

**Converting Solid, Surface or Graphics Bodies to Mesh**

You can convert a standard SOLIDWORKS body or graphics body to a mesh BREP body using the Convert to Mesh Body tool.

**Selection Filters for Mesh Bodies**

**Selecting Facets Using Paint Select Tool**

You can select groups of facets in the graphics area with the Paint Select tool.

**Creating a Surface from Mesh Feature**

The Surface From Mesh tool lets you manipulate a mesh object that you import from an *.stl, *.obj, *.off, *.ply, *.ply2 , or *.3MF file to create surfaces, and solids.

**Segment Imported Mesh Body Tool**

You can use the Segment Imported Mesh Body tool to group facets of a mesh BREP body into faces bounded by sharp corners, planar faces, and cylindrical faces.

**Decimating Graphics Mesh Bodies**

You can use the Decimate Mesh Body tool to reduce the facet count in graphics mesh bodies. A lower facet count makes it easier to modify a graphics mesh body.

**List of Features Supporting Mesh BREP Bodies**

The following tables list the functionality that supports solid, surface, and graphics mesh BREP bodies.

**List of Features Supporting Hybrid BREP Bodies**

The following table lists the features that you can add as standard SOLIDWORKS BREP geometry to a mesh BREP body, which converts the mesh BREP body to a hybrid BREP body.

**List of Features Supporting Mesh BREP Bodies**

The following tables list the functionality that supports solid, surface, and graphics mesh BREP bodies.

**Parent topic**Parts and Features