Controlling polygon body tessellation

When you create a FEM file that is associated with a part, you can control the level of tessellation that the software uses to represent the edges and faces of the underlying CAD part in the polygon geometry. When the software creates a polygon body, it uses a series of facets, similar to a mesh, to represent the faces. The number of facets that the software uses defines how the polygon geometry appears.

• Fewer facets result in a more generalized representation of the CAD geometry in the polygon geometry.

• A larger number of facets result in a more detailed representation of the CAD geometry in the polygon geometry.

Increasing the resolution increases the amount of tessellation that the software uses to represent the CAD geometry as polygon geometry.

Specifying the level of resolution for new polygon bodies

Use options in the Polygon Body Resolution list in the New FEM or New FEM and Simulation dialog boxes to specify whether the software should use a standard, medium, or high level of resolution. The software applies the resolution setting that you select to all polygon bodies in the FEM file.

• Use the Standard resolution option for most parts. This option provides the best balance between accurately representing the part data in the polygon geometry and the size of the FEM file.

• Use the Medium resolution option for parts where you want to capture the curvature of edges very accurately. This option corresponds to the High Resolution Polygon Body option that was available in the Meshing Preferences dialog box in previous releases.

• Use the High resolution option for parts where you want to capture the curvature of edges and faces very accurately. The software highly refines the tessellation in the regions where edge and face curvature are high. This option is helpful for models in which the curvature at interior face locations is higher than it is along the edges of those faces and for models that contain doubly curved surfaces.

• Use the Custom resolution option to control the level of tessellation, or number of facets, that the software uses to represent the edges and faces of CAD geometry as polygon geometry. The number of facets that the software uses affects the level of detail in the polygon geometry. You can specify:The maximum distance between facets The maximum angle between facets.For example, for parts where you want to capture the curvature of edges and faces very accurately, you can specify smaller values for these tolerances.

Note:

You can also use the Resolution of Polygon Bodies customer default to set the default value for the Polygon Body Resolution list in the New FEM or New FEM and Simulation dialog boxes when you first create a FEM file.

Modifying the tessellation for existing polygon bodies

For existing polygon geometry, you can use the Edit Polygon Body Resolution dialog box to modify the resolution setting for a selected body or bodies. After you use the Polygon Body Resolution option to select a new level of tessellation, you can use the Recreate Body option to specify how you want the software to recreate the polygon body at the new resolution level.

Listing information about polygon body resolution

You can use options in the Simulation Navigator to view resolution information for a polygon body.

• The Status column now displays the type of resolution that the software used to create each polygon body.

• The Information command now lists the type of resolution that the software used to create the body.

Where do I find it?

New FEM or New FEM and Simulation dialog boxes

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed partThe idealized part loaded
Simulation Navigator	Right-click the idealized part→New FEM or New FEM and Simulation

Edit Polygon Body Resolution dialog box

Application	Pre/Post
Prerequisite	A FEM file as the work part and displayed partThe idealized part loaded
Simulation Navigator	In the Polygon Geometry node, right-click the appropriate polygon body→Edit Resolution

Resolution of Polygon Bodies customer default

Menu	File→Utilities→Customer Defaults
Location in dialog box	Simulation→Pre/Post→General→FE Model Create tab

Learn more

Geometry abstraction and polygon geometry

Polygon geometry

Polygon geometry versus lightweight facet bodies

Understanding CAD issues reported during FEM creation

How edges are represented in a solid model

Modeling tolerance values

Comparing geometry idealization and geometry abstraction

Understanding the geometry abstraction process

Displaying suppressed edges in polygon geometry

Checking CAE model consistency

Naming of polygon bodies, meshes, and properties

Tools for identifying and repairing polygon body problems

Synchronizing polygon body names and attributes to the CAD geometry

Polygon body update process

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Related Topics

Generating surface wrap bodies and meshes

Controlling polygon body tessellation, Simcenter 3D 2021.1 Series

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