To select triangles for repair

To use the basic selection commands

1. Click one of the basic selection commands from the toolbar. Available options include:
   • Select Triangles: Selects individual triangles.
   • Select Surfaces: Selects consecutive triangles until they are angled further than a configurable threshold away from the previous one.
   • Brush Selection: Selects individual triangles by painting over them with a brush.
   • Select Shells: Selects entire shells.
   Tip: Hold Ctrl and click on a triangle, surface, or shell to add to or subtract from the selection based on the current selection state of the clicked triangle.

Left: Selected triangles. Center: A selected surface. Right: A selected shell.

In addition to these basic selection commands, you can quickly select all triangles, clear the selection, or toggle the selection.

• Click Select all Triangles to select every triangle in the mesh.
• Click Clear Selection to deselect all triangles.
• Click Toggle Selection to flip the selected and unselected triangles.

To use the selection primitive

1. Click one of the selection options from the toolbar listed under Selection Primitive. Available options include:
   • Select All Triangles: Selects all triangles that lie within the selection primitive, regardless whether they are on the backside of the part or whether they are covered by other triangles.
   • Select Front-Facing Triangles Only: Selects triangles facing the front of the display, even when they are covered by other triangles.
   • Select Uncovered Triangles Only: Selects triangles which face either the front or back towards the camera, but are not covered by other triangles.
   • Select Front-Facing and Uncovered Triangles Only: Selects only the triangles partly or fully visible from the current viewing perspective.
2. Choose a selection type. Available options are Triangles or Shells.
3. Choose a primitive selection shape. Available options are Rectangle or Circle.
4. In the display, click and drag with the mouse to create the primitive shape.

Left: Drag a primitive shape. Right: The resulting selection.

To expand or shrink the selection

If you have already selected triangles or surfaces, you can quickly expand or shrink the selection.

1. Select one or more triangles or surfaces.
2. Right-click the selection and choose Expand Selection to include the adjacent triangles or surfaces in the selection.
3. Right-click the selection and choose Shrink Selection to remove the adjacent triangles or surfaces in the selection.

To select triangles around a hole

If you have a part that contains a hole, some actions benefit from, or even require, selecting one or more of the triangles directly touching the hole.

1. Right-click an edge of the hole.
2. Choose Select all Surrounding Triangles to select every triangle touching the hole.
3. Choose Select Attached Triangle only to select the triangle adjacent to the edge.

In preparation for freeform-hole closing, the triangles surrounding the hole have been selected.