User Manual

Table Of Contents
B-Spline Mask [BSP]
The B-Spline node
A B-Spline mask is identical to a Polygon mask in all respects except one. Where Polygon
masks use Bézier splines, this mask node uses B-Splines. Where Bézier splines employ a
central point and two handles to manage the smoothing of the spline segment, a B-Spline
requires only a single point. This means that a B-Spline shape requires far fewer control points
to create a nicely smoothed shape.
When first added to a node, the B-Spline mask consists of only Center control, which is visible
onscreen. Points are added to the B-Spline by clicking in the viewer. Each new point is
connected to the last one created, but instead of the spline going directly through each control
point, B-Spline control points only influence the spline shape. The control point pulls the spline
in its direction to create a smooth curve.
Like the Polygon mask tool, the B-Spline mask auto-animates. Adding this node to the Node
Editor adds a keyframe to the current frame. Moving to a new frame and changing the shape
creates a new keyframe and interpolate between the two defined shapes.
Inputs
The B-Spline mask node includes a single effect mask input.
Effect Mask: The optional blue input expects a mask shape created by polylines,
basic primitive shapes, paint strokes, or bitmaps masks. Connecting a mask to this
input combines the masks. How masks are combined is handled in the Paint mode
menu in the Inspector.
Basic Node Setup
The B-Spline node can be used to generate a single smooth spline shape or combined with
other masks for more complex shapes. In the node tree below, the B-Spline mask is used to
generate a smooth, curved shape as a garbage matte on the Delta Keyer.
A B-Spline node generates a smooth, curved shape as a garbage matte
Chapter – 97 Mask Nodes 2104