See Geometric Primitives, Geometry Operations and Virtual Geometry and Mesh Control Operations for descriptions of the geometry features. The tables in each section link to the individual feature Settings window descriptions.
To add features to a geometry sequence, use the buttons in The Geometry Toolbar or right-click the Geometry node () in the Model Builder and then select one of the available options.
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If you choose CAD kernel (requires the CAD Import Module), all objects and operations that support the CAD Import Module’s kernel use it. For example, Work Plane, Extrude, and Revolve operations do not support this kernel. You need to choose the CAD kernel to use the defeaturing and repair tools, such as the Cap Faces feature, as well as to import 3D geometries using various 3D CAD file formats.
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If you choose COMSOL kernel, all objects are represented using COMSOL’s kernel.
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If you solve a model using the CAD kernel, it is not possible to view and postprocess the solution if you open it in a COMSOL Multiphysics session where a license for the CAD Import Module is not available, unless, before saving the model, you change the geometry representation to COMSOL kernel and update the solution.
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The default value in the Default repair tolerance list is Automatic, which for the COMSOL kernel is a relative repair tolerance of 10−6. For the CAD kernel, the automatic setting changes the representation of the input objects so they get a common scale factor, which is the maximum of the scale factors of the input objects; if the operation fails, the automatic setting uses the COMSOL kernel instead.
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Choose Relative to enter a value for the Default relative repair tolerance field (the default is 10−6). This value is relative to the largest absolute value of the coordinates of all input objects.
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Choose Absolute to enter a value for the Default absolute repair tolerance field (the default is 10−6; SI unit: m). This value uses the same unit as the geometry sequence’s length unit.
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