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Fill Method
The Fill Method menu offers two different techniques for dealing with overlapping regions of a
polyline. If overlapping segments in a mask are causing undesirable holes to appear, try switching the
setting of this control from Alternate to Non Zero Winding.
Right-Click Here for Shape Animation
By default, all B-Spline masks are animated when they are created. The initial keyframe is set to the
current time, and any changes to the shape at different times will create new keys.
Right-clicking on this label will display a contextual menu that offers options for removing or re-adding
animation to the mask, or publishing and connecting the masks.
Adding Points
Adding Points to a B-Spline effect mask is relatively simple. Immediately after adding the node to the
Node Editor, there are no points, but the tool will be in Click Append mode. Click once in the viewer
wherever a point is required for the mask. Continue clicking to draw the shape of the mask.
When the shape is complete, click on the initial point again to close the mask.
When the shape is closed, the mode of the polyline changes to Insert and Modify. This allows you to
add and adjust additional points on the mask by clicking the spline segments. To lock down the mask’s
shape and prevent accidental changes, switch the Polyline mode to Done using the Polyline toolbar or
contextual menu.
Adjusting Tension on a B-Spline
The tension of the control point determines the smoothness of a B-Spline. To adjust the tension of a
B-Spline’s control points, select the point in the viewer, hold down the W key and drag the mouse
pointer to the left and right to increase or decrease the tension of the curve through that point.
Adjusting Tension on a B-Spline
B-Spline Toolbar
When a B-Spline mask is selected in the Node Editor, a toolbar appears above the viewer with buttons
for easy access to the modes. Position the pointer over any button in the toolbar to display a tooltip
that describes that button’s function.
B-Spline Mask Polygon toolbar
Chapter 106Mask Nodes 2037
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