Project to Faces
Use the Project to Faces () feature to create imprints on faces by projecting edges onto the face.
To add the feature to a geometry sequence, in the Geometry toolbar, Booleans and Partitions menu, click Project to Faces. You can also right-click the Geometry node and add this node from the Booleans and Partitions submenu.
Target
Select the faces that you want to project to in the Graphics window. The faces appear in the Faces to project to list. If the geometry sequence includes user-defined selections above the Project to Faces node, choose Manual to select faces, or choose one of the selection nodes from the list. Click the Activate Selection button to toggle between turning ON and OFF the Faces to project to selections.
Select the Imprint checkbox (default) to create imprints and partition the target faces. Clear this checkbox to keep the target faces unmodified, and to return the projected edges/vertices as separate objects with one output object for each object in the Faces to project to selection. This checkbox is disabled and imprints are always created on the target faces if the Project to Faces feature is added after a Form Union/Form Assembly node in the geometry sequence.
Tool
From the Geometric entity level list, select Edge (the default) to project selected edges, or select Boundary to project the edges of selected faces. In both cases, choose the tool entities and add them to the Entities to project list below.
Options
Select a Projection direction — Perpendicular to faces to project to (the default), Vector, Edge, or Perspective.
•
For Perpendicular to faces to project to, note that the projection direction can vary along the target faces to match the face normal direction.
•
For Vector, enter the vector components for the projection direction in the x, y, z fields.
•
For Edge, choose a straight edge as the projection direction and add it to the Straight edge list.
•
For Perspective, choose a point for the eye position and add it to the Eye position list. Note that projected entities are not created on target faces that are shadowed by faces on the object that the target faces belong to.
Enter a value or expression to specify the Maximum distance (SI unit: m; default Inf). Projected entities that are not entirely within this distance from the tool entities will be discarded from the result.
By changing the settings for the Repair tolerance list you can control the snapping of the projected entities to the existing edges and vertices on the target faces. Projected entities that are within a distance less than the repair tolerance from exiting edges or vertices on the target are snapped together.
•
The default value in the Repair tolerance list is Automatic, which determines an appropriate repair tolerance internally.
•
Choose Relative to enter a value for the Relative repair tolerance field (the default is determined by the main Geometry node’s setting). This value is relative to the largest absolute value of the coordinates of all input objects.
•
Choose Absolute to enter a value for the Absolute repair tolerance field (the default is determined by the main Geometry node’s setting; SI unit: m). This value uses the same unit as the geometry sequence’s length unit.
When you build this feature, the relative and absolute repair tolerances are set to the values that are used (with a precision of two digits), which can be useful when you have set Repair tolerance to Automatic.
Select the Extend projected edges checkbox (cleared by default) to make sure that all projected edges are connected to another edge at both ends.
Selections of Resulting Entities
Select the Resulting objects selection checkbox to create predefined selections (for all levels — objects, domains, boundaries, edges, and points — that are applicable) in subsequent nodes in the geometry sequence. To also make all or one of the types of resulting entities (domains, boundaries, edges, and points) that the resulting objects consist of available as selections in all applicable selection lists (in physics and materials settings, for example), choose an option from the Show in physics list: All levels, Domain selection, Boundary selection, Edge selection, or Point selection. The default is Domain selection, which is suitable for use with materials and physics defined in domains. For use with a boundary condition, for example, choose Boundary selection. These selections do not appear as separate selection nodes in the model tree. Select Off to not make any selection available outside of the geometry sequence.
If you want to make the resulting entities contribute to a cumulative selection, select a cumulative selection from the Contribute to list (the default, None, gives no contribution), or click the New button to create a new cumulative selection (see Cumulative Selections in the COMSOL Multiphysics Reference Manual).
Assigned Attributes
From the Construction geometry list choose On to make the resulting objects available only in the feature’s geometry sequence. The default option Inherit from input means that the resulting objects become construction geometry if all input objects are construction geometry. Choose Off to never output construction geometry objects. For more information see Construction Geometry in the COMSOL Multiphysics Reference Manual.