Paint Tools properties

General

Color: Displays the current color for the Paint Brush. Click the color tile to display the Color Chooser window and modify the color assigned to the Paint Brush.
Affect: Specific to the Dodge and Burn tools. The presets let you bias the lightening (Dodge) or darkening (Burn) effect that occurs within the specified tonal range in the areas you stroke:

Note
Repeated strokes of the tool in the same area of an image build up the effect.

Midtones: Affects the mid-tones (gray value range) on the texture image.
Highlights: Affects the light gray to white values on the texture image.
Shadows: Affects the darker gray to black tones on the texture image.
All: Affects all tones on the texture image.

Exposure: Specific to the Dodge and Burn tools. Controls the amount of lightening or darkening that occurs on the affected pixels for each stroke of the brush depending on the Affect setting.
Blur Strength: Specific to the Blur tool. Determines the size of the circular area (in pixels) that is sampled to determine the amount of blur. The larger the radius, the greater the amount of blur. See Blur detail in painted textures.
Contrast: Specific to the Contrast brush. Controls the difference between light and dark pixels. A positive value increases the contrast, negative values reduce it. The range is -10 to 10, default is 1.
Amount: Specific to the Sponge brush. Increases or decreases the color saturation for pixels in an image as you stroke. A positive value decreases pixel color saturation, while a negative value increases it. The range is -1 to 1, default is 1.
Hue Shift: Specific to the Hue Shift brush. Specifies the amount in degrees to shift hue values around the color ring relative to their current value. For example, a Hue Shift setting of 90 degrees shifts a red pixel hue to green (based on a counter-clockwise direction around the color ring). You can enter positive or negative values ranging between 1 to 180 degrees and also use the Color Chooser for reference. See Using the Color Chooser.
Size: Sets the radius of the tool. Size is measured in world space units (for example, a default Size of 100 = a radius of 100 centimeters). Hotkeys: press b and drag, or press the square bracket keys, [ to reduce size and ] to increase size.
Strength: Determines how much the tool applies with each stroke. Hotkey: M + drag or press ; (to reduce strength) and ' (to increase strength).
Mirror: Reflects a stroke from one side of a model to the other, along the specified axis:

Off: Strokes are not reflected.
X: Reflects strokes across the world space X-axis.
Y: Reflects strokes across the world space Y-axis.
Z: Reflects strokes across the world space Z-axis.
Local X: Reflects strokes across the local space X-axis.
Local Y: Reflects strokes across the local space Y-axis.
Local Z: Reflects strokes across the local space Z-axis.
Tangent: Reflects strokes across the topological center line of a topologically symmetrical model. To use tangent space mirroring on a model, you must first define the model's topological center. See Set a topological axis.

Use Stamp Image: Turns on the selected stamp for the tool. Stamps modify the strength of the paint brush according to the gray scale values in the stamp image. The darker the overall values the lower the strength of the tool. Not all paint brushes work with stamps.

Orient To Stroke: When on, the stamp orientation follows the direction of your brush stroke.
Rotate: Rotates the stamp image clockwise.
Horizontal Flip: Flips the stamp image horizontally.
Vertical Flip: Flips the stamp image vertically.
Randomize: Turns the Randomize options for the tool stamp on or off.
Random Horizontal Offset: Randomizes the horizontal position of the brush tip dynamically through the stroke.
Random Vertical Offset: Randomizes the vertical position of the brush tip dynamically through the stroke.
Randomize Rotate: Randomizes the rotation of the brush tip dynamically through the stroke.
Randomize Scale: Randomizes the size of the brush tip dynamically through the stroke.
Randomize Strength: Randomizes the strength of the brush tip dynamically through the stroke.
Horizontal Flips: Randomly flips the position of the brush tip along its X axis dynamically through the stroke.
Vertical Flips: Randomly flips the position of the brush tip along its Y axis dynamically through the stroke.

Stamp Spacing: Controls the stamp frequency/continuity on a stroke. Depending on the Size and Falloff settings for a tool, the Stamp Spacing can be set to a higher value to refine the tool behavior and improve the appearance of the stroke. The default setting is 6.25 and ranges between 0 and 100. The higher the setting, the more gaps appear on the stroke, depending on the tool settings.
Steady Stroke: Helps to produce a smoother stroke by filtering mouse/stylus movement. When on, a vector displays on the tool cursor and no stroke appears until you drag a distance equal to the length of the vector. The length of the vector is set by the Steady Stroke Distance property.
Steady Stroke Distance: Sets the length of the Steady Stroke vector on the tool cursor.

Falloff

Lets you specify how the tool effect diminishes (or not) from its center point to its outer edge. The falloff is represented as a curve that can be edited. See also Adjust tool falloff.

Falloff presets are available in the Falloff tray.

Snap: Constrains points to the grid.
Store To: Saves the current falloff curve to the tray.
Falloff image: Right-click the falloff image in the Properties window for the following options:

Insert Point: Inserts a new point under the cursor.
Select Point: Selects the point under the cursor.
Delete Point: Deletes the point under the cursor.

Falloff based on Facing Angle: When on, Mudbox reduces the effect of the Sculpt or Paint tool on parts of the model that face away from the camera. You can define the threshold values for the falloff using Falloff Start Angle and Falloff Range values.

For example, if the Falloff Start Angle is set to 85, and the Falloff Range is set to 5, faces with a facing angle from 0 to 85 degrees have no falloff. From 85 to 90 degrees, the falloff goes from nothing to full. For faces with facing angles over 90 degrees, the brush has no effect at all.

Falloff Start Angle: Sets the maximum angle below which no falloff is applied. The allowed range of values is 0 to 90.
Falloff Range: The number of degrees over which the falloff goes from minimum to maximum. The allowed range of values is between 0 and 180, minus the Falloff Start Angle value. For example, if you set the Falloff Start Angle to 45, the Falloff Range can be from 0 to 135.

Advanced

Remember Size: Preserves the size of the tool after use. When off, the brush inherits the size of the previously used brush.
Orient To Surface: Orients the tool cursor display (in the 3D View) along the normal of the face under the center of the cursor ring. Influences cursor display only, does not influence the effect of the brush on the surface.

Pen Pressure

Min Size: Specifies how small the tool is when the lightest pressure is applied to the pen, expressed as a percentage of the tool’s Size property. For example, a Min Size of 100 indicates there is no size variance, regardless of the pressure applied.
Min Strength: Specifies how weak the tool strength is when the lightest pressure is applied to the pen, expressed as a percentage of the primary tool Strength value. For example, a Min Strength of 100 indicates there is no strength variance, regardless of the pressure applied.