The Brush Radius Graph appears when you click the Radius button on the Setup rollout of a Particle Paint helper. It allows you to animate the brush radius over the time of a single stroke.
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Select a Particle Paint helper. >
Modify panel > Setup rollout > Brush Adjustment group > Turn on Radius. > Click Radius.
The left end of the graph represent the start of the stroke, while the right end represents the end of the stroke. The values in the left column represent the brush radius in units.
Move the existing control points, or add and move more control points, to change the curve over the length of the stroke.
The controls on this dialog are similar to those on the loft deformation dialogs in 3ds Max.
Moves control points in any direction. The exceptions are the start and end control points, which can be moved only vertically.
Moves control points horizontally only. This button is available from the main Move button flyout.
Moves control points vertically only. This button is available from the main Move button flyout.
Scales selected control points with respect to the 0 value.
Inserts a Corner point on the graph.
Inserts a Bezier point on the graph. This type of point has handles that you can adjust for a smooth curve. This button is available from the Corner point button flyout.
Deletes a control point.
Pans the graph.
Zoom Extents, Zoom Hoifrizontal Extents, and Zoom Vertical Extents zoom the graph in or out to fit in the window.
Interactive zoom controls zoom horizontally or vertically, zoom the entire window, or zoom to a selected region.