Shear

Reference

Mode

Object and Edit Modes

Menu

Object/Mesh/Curve/Surface ‣ Transform ‣ Shear

Hotkey

Shift-Ctrl-Alt-S

Shearing is a form of movement where parallel surfaces move past one another. During this transform, movement of the selected elements will occur along the horizontal axis of the current view. The axis location will be defined by the Pivot Point. Everything that is “above” this axis will move (Shear) in the same direction as your mouse pointer (but always parallel to the horizontal axis). Everything that is “below” the horizontal axis will move in the opposite direction.

../../../../_images/modeling_meshes_editing_transform_shear_operator-panel.png

Shear Offset Factor.

Usage

Select the elements you want to operate on and activate the Shear transform tool. The Shear tool can be invoked from the Object/Mesh/Curve/Surface ‣ Transform ‣ Shear menu or by pressing Shift-Ctrl-Alt-S. The amount of movement given to the selection can be determined interactively by moving the mouse or by typing a number. Pressing Return will confirm the transformation. The confirmed transformation can be further edited by pressing F6 or by going into the Tool Shelf and altering the Offset slider provided that no other actions take place between the Shear transform confirmation and accessing the slider.

Note that the result of the Shear transform is also dependent on the number and type of selected elements (objects, vertices, faces, etc.). See below for the result of using Shear on a number of different elements.

../../../../_images/modeling_meshes_editing_transform_shear_mesh.png

The effects of a Shear transform with different Pivot Points.

The three frames of the image above show the effects of shearing on the selected vertices when the pivot point is altered. In middle frame, the Pivot Point is set to Median Point and the mouse was moved to the left during the transform. In right frame, the Pivot Point is set to the 3D cursor which is located above the mesh. When the mouse is moved to the left during a Shear transform, the selected vertices are moved to the right as they are below the horizontal axis.

Tip

Shear Transform Magnitude

The magnitude of the Shear transform applied to the selected elements is directly proportional to the distance from the horizontal axis. i.e. the further from the axis, the greater the movement.

../../../../_images/modeling_meshes_editing_transform_shear_objects.png

The effects of a Shear transform on objects with different Pivot Points.

The three frames of the image above show the effects of shearing on the selected Objects when the Pivot Point is altered. In middle frame, the Pivot Point is set to Median Point and the mouse was moved to the left during the transform. In right frame, the Pivot Point is set to the 3D cursor which is located above the Objects. When the mouse is moved to the left during a Shear transform, all of the selected Objects are moved to the right as they are below the horizontal axis. Again, note that, the magnitude of the transform is proportional to the distance from the horizontal axis. In this case, the lower Objects move further than the upper ones.