Modifying faces created from existing meshes

After you use the Face from Mesh command to create a new polygon face from element data, you can modify:

• The new polygon face.

• The mesh associated with the polygon face.

The modifications you can make depend on whether you selected 2D elements or the faces of 3D elements to create the new face.

Modifying faces that were created with 2D elements

In general, you can use the commands in the Polygon Geometry group to modify faces that you created from 2D elements. However, the boundaries are frozen by any non-geometry associative (orphan) elements that are adjacent to that face. This occurs where nodes on the face created with the Face from Mesh command are shared with elements that are not associated with that face.

In the following graphic, the blue boundaries indicate boundaries that you can modify, while the red boundaries indicate boundaries that are frozen by adjacent elements.

• (A) shows the boundaries of a new face that was created from all the 2D elements. You can modify all the boundaries of this face because there is no adjacent orphan mesh.

• (B) shows the boundaries of a new face that was created with a subset of the 2D elements. Here, the red boundary indicates the edges that are frozen because of the adjacent orphan mesh.

In (C), two separate faces were created from the elements: F1 and F2. Notice that the boundary between F1 and F2 is modifiable. However, because F2 is adjacent to an orphan mesh, one of its boundaries is frozen.

Modifying faces that were created from 3D element faces or a 3D mesh

When you create a new face from 3D element faces or a 3D mesh, all the edges of the new face are always frozen, regardless of whether it is adjacent to an orphan mesh. This means that in general, you cannot use the commands in the Polygon Geometry group to make changes to the face.

The only exception to this is the Split Edge command. You can use the Project Point on Edge option to subdivide the edge of the new face at the location of an existing node.

Learn more

Creating faces from existing meshes

Creating a face from a mesh by selecting elements

Creating faces from existing meshes by selecting meshes

Face from Mesh example: Connecting a legacy mesh to new geometry

Face from Mesh example: Remeshing a portion of your model

Creating faces from existing boundaries

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Related Topics

Generating surface wrap bodies and meshes

Modifying faces created from existing meshes, Simcenter 3D 2021.1 Series

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