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For an imported mesh, right-click in the Graphics window to open up The Graphics Context Menu and select Create Edges (). In 3D, do this from the Create Entities menu.
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For a 3D mesh, it is available from the Create Entities menu () on the Mesh ribbon. For 2D meshes, click the Create Edges () button directly on the Mesh ribbon.
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It is only possible to select mesh edges on boundaries in 3D which are visible in the Graphics window. Use Click and Hide and the clipping tools to get access to interior boundaries. Rotate the mesh to make the opposite side come into view.
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Select Element size (the default) to specify the maximum element size (SI unit: m), which you enter in the Maximum element size field. The value is a relative number (default: 0.1 in 3D and 1/15 in 2D). This value is multiplied with the size of the bounding box.
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Select Fixed number of elements to use a fixed number of mesh elements, which you enter into the Number of elements field (default: 1).
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Select Explicit distribution to use an explicit, user-defined element distribution. To define the distribution of mesh elements, enter a vector-valued expression defining a strictly increasing sequence of nonnegative numbers (using comma-separated numbers) in the Relative placement of vertices along edge field, specifying the relative arc length values of the mesh vertices along the edge or boundary. Select the Reverse direction check box to reverse the direction of the explicit distribution.
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Select Predefined distribution to specify properties of a predefined distribution method that can be a Geometric sequence (exponentially increasing or decreasing element size) or an Arithmetic sequence (constant difference in size between neighboring elements), which you choose from the Growth formula list. In addition, specify values in the Number of elements and Element ratio fields to determine the number and ratio of elements in the distribution. Select the Symmetric distribution check box to make the predefined size distribution symmetric. Select the Reverse direction check box to reverse the direction of the predefined distribution.
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See From Surface Mesh to Geometry: STL Import of a Vertebra: Application Library path COMSOL_Multiphysics/Meshing_Tutorials/stl_vertebra_import.
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