Working with Shaders in Preview

When selected, represented by a yellow cross anchor point, a yellow point (rotation), a rectangle with multi-colored sides and a blue corner triangle (resize). A red handle appears at one corner when moving your mouse over it.

When you see only the cross anchor, drag it to display the other handles.

• Select the Shader: click on any part of it, then move it.
  This can also be done by selecting a corner red handle when the cursor moves over it.

By moving the mouse over the corner of the rectangle, a red snap point is displayed. A snap point to edge can be activated by holding down the Shift key (snaps only on meshes, not onto the bounding box).

• Click on one colored side of the rectangle. The line becomes highlighted, then move the Shader parallel to the direction.
• A snap edge can be activated by holding down the Shift key when moving (snaps only to edges in mesh, not onto the bounding box).

• By clicking on a yellow handle, a purple circular cursor is displayed; move the yellow point around the cursor.
• Holding down the Shift key while clicking on the object increments the rotation by 15°.