At the top of the panel is a preview of the Brush alpha shape followed by a series of behavior controls.
Brush Rotation: This sets the initial orientation of the alpha at the beginning of the stroke.
Zero Pressure Radius: When using a tablet stylus, this number indicates the default radius at the beginning of the brush stroke.
Depth Modulator: The default depth for each brush being used.
Rotation Amplitude: Sets the amplitude for additional brush rotation.
Radius Variation: Sets the percentage of random brush radius variation.
Depth Variation: Sets the percentage of random brush depth.
Jitter Opacity: Defines the randomness of the brush opacity setting.
Jitter Position: The overall randomness of brush behavior.
Jitter Hue: Defines the randomness of the brush hue when used for painting color.
Jitter Brightness: Varies the brightness randomly over the course of a stroke.
Jitter Saturation: Varies the saturation of the primary color randomly over the course of the stroke.
Vary color per stroke: Use this option to produce painting effects, like fur or hair, when you need to either vary the Hue/Saturation/Brightness as you paint a single stroke (variegated strand color), or when you want each stroke made to have a slightly different Hue/Saturation/Brightness, as determined by the corresponding “Jitter” setting.
Random flip (x, y): This randomly flips the selected brush across its x or y axis while painting.
Paint with dabs: Creates paint or sculpting “dabs” which occur at some set spacing, as determined by the “Spacing” control.
Rotate along stroke: When using brush alpha shapes, you want to align like the bristles of a brush so that they change relative direction as the brush changes direction; all along the stroke, use this option.
Skip eraser: Disables the “Erase Layer” of the Brush.
Sharp Shape (old style): This check box allows you to draw alphas more sharply (it is closer to old-style 3DCoat painting).
Spots will not blend with each other. It means better following alpha shape but also sharper stroke self-intersection. This option is not working for airbrush and native (not surface) voxel tools. Airbrush and voxel tools are always working in sharp mode.
Sharp Shape with all alphas: Use this setting to cause both sculpting and painting brushes to strictly adhere to the shape defined by the Brush Alpha.
Fade on edge: All strokes painted with this option checked will have a smoother edge transition.
Use spacing: When used with the “Paint with dabs” option, adjusting the “Spacing” percentage slider determines how close or far apart the paint dabs are applied.
Apply Brush “Dabs” with Spacing: This causes the current Brush to especially respond to the “Dabs, Jitter, and Spacing” options found in the “Brush Options” Panel. Experimentation demonstrates this action best.
Tutorials
How to fast rotate your alpha ?
Evil_Weasel: you can assign a shortcut for rotating alpha. There is an action called “Start brush rotation” in Customize navigation menu.
