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Lesson 7. RotoShape > Add Shapes Mode versus Edit Shapes Mode

Add Shapes Mode versus Edit Shapes Mode

1.
Start Shake.

2.
In the Image tab, select the RotoShape node.

When the RotoShape node is active, the associated tools appear on the Viewer toolbar.

There are two modes in RotoShape: Add Shapes mode (below, left) and Edit Shapes mode (below, right). You draw your initial shape and add shapes in the Add Shapes mode, and you modify or animate the shape in Edit Shapes mode.

3.
Start by clicking on a blank spot in the Viewer.

When you click on a blank spot, a new knot (or point) will append there. As you click, if you drag away from the knot, tangents are created.

4.
Continue the shape by dragging away from the knots as you draw to create tangents.

In Add Shapes mode, the shape does not render until you close the shape.

5.
To close the shape, click on the first knot that you added to the Viewer.

When you are in Add Shapes mode, the shape will not draw (and will therefore not affect later nodes). When you close the shape by clicking on the first knot, you are automatically switched over to Edit Shapes mode. In this mode, if you click on a blank spot and drag, you are now selecting knots. Either drag to select a new group of knots, Shift-drag to add to your group of active knots, or Cmd-drag to remove from your active group of knots.

Inserting and Modifying Points and Tangents

1.
Insert a new knot by holding down Shift and clicking on a segment area.

A new knot will appear.

2.
Remove a knot by selecting it and then pressing the Del key or clicking the Delete Knot button.

You can modify a tangent in two ways: splined or linear. If you select it, you can toggle between Spline (below left) and Line mode (below right).

3.
Select two knots and click on the Spline/Line toggle to the Line setting.

In this example, the two right knots have been made linear.

4.
Toggle the Spline/Line toggle back to the Spline setting.

5.
Try breaking a tangent by Ctrl-dragging on the end of the tangent:

Once it is broken, you can release the Ctrl key.

6.
Drag one of the two broken tangents and you'll notice that the tangents are locked relative to each other.

To realign the tangents, hold down Shift and click on the tangent end.


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