You can add a shadow to an object, multiple objects, and groups of objects in Twist.
Select the object(s) you want to add the shadow to.
Click the Shadow button on the editing panel.
A shadow will be applied to the selection.
Click the Edit button in the Shadow area of the editing panel to see all of the shadow options.
Use the Opacity slider to change the opacity of the shadow. Move the slider to the right to make the shadow more opaque; move it to the left to make the shadow more transparent.
Use the color slider to select the shadow color.
Use the Angle & Distance wheel to choose the direction and distance for the shadow.
Drag the arrowhead in the direction you want the shadow to be cast.
Drag the arrowhead away from the center of the wheel to increase the distance between the object and the shadow.
Use the Blur slider to change the definition of the shadow. To make the shadow sharper, move the slider to the left. To blur the shadow, move the slider to the right.
Click the Go Back button on the editing panel when you are finished changing the shadow options.