The most basic selection techniques use either the mouse, or the mouse in conjunction with a keystroke.
Bed selected in wireframe
Bed selected in shaded view with Selection Brackets enabled
To select an object in the viewport:
Alternatively, right-click in a viewport to open the quad menu, and from the Transform menu choose Move, Rotate, Scale, or Select.
The cursor changes to a small cross when it’s positioned over an object that can be selected.
The valid selection zones of an object depend on the type of object and the display mode in the viewport. In shaded mode, any visible surface of an object is valid. In wireframe mode, any edge or segment of an object is valid, including hidden lines.
A selected wireframe object turns white.
In shaded views, by default selected objects appear with edged faces. You can also opt to display selected objects with white brackets at the corners of their bounding boxes.
To select all objects do one of the following:
This selects all objects in your scene.
To invert the current selection do one of the following:
This reverses the current selection pattern. For example, assume you begin with five objects in your scene, and two of them are selected. After choosing Invert, the two are deselected, and the remaining objects are selected.
To extend a selection:
This adds the objects you click to the current selection. For example, if you have two objects selected and Ctrl+click to select a third, the third object is added to the selection.
Holding down Ctrl also works with Selecting by Region.
To reduce a selection:
This removes the objects you click from the current selection. For example, if you have three objects selected and Alt+click one of them, the third object is removed from the selection.
Holding down Alt also works with Selecting by Region.
To lock a selection:
While your selection is locked, you can drag the mouse anywhere on the screen without losing the selection. The cursor displays the current selection icon. When you want to deselect or alter your selection, click the Lock button again to turn off locked selection mode. The keyboard toggle for locked selection mode is spacebar.
To deselect an object, do one of the following:
When you move the mouse over objects in Nitrous viewports, a yellow outline shows the objects you can click to select. When you've selected an object, a blue outline shows the selection.
A yellow outline shows objects you can click to select.
A blue outline shows selected objects.
When objects overlap, the outline appears only for the closest or foremost object under the cursor. If an object is completely obscured by another object, there is no preview. Also, the yellow outline appears around the entire object, whether or not it's partly behind or inside another object in the viewport.
Region selection does not display the preview outline.
To disable the selection preview or the selection outline, or change their appearance, use Customize Preferences Viewports panel.