Interactive grooming Brush Falloff and Root to Tip Magnitude Control settings

Lets you specify how the tool effect diminishes from its center point to its outer edge. The falloff is represented as a curve that can be edited. This curve works similar to the sculpting toll falloff curve. See Adjust tool falloff.

The Place, Cut, and Select brushes do not have falloff.

Falloff Type

The brush assigns a falloff value to each CV in the its radius depending on its distance from the center point. The farther a CV is from the center point, the more falloff is applied. The following falloff types use different methods to measure this distance, and produce unique results.

Volume
The brush measures distance by drawing a straight line from the center of the brush to each hair strand CV in the brush radius. CVs are assigned a falloff value depending on how far away they are from the center point. Volume falloff affects all the CVs that are in the brush radius.
Screen
The brush measures falloff distance from the center to the edge of the brush radius. Falloff displays as a 2-D projection from the camera angle to the hair CVs. This falloff type is useful when sculpting from the camera angle, which makes it easier to shape the hair's profile view.

The Density brush does not have Screen falloff.

Surface
The brush measures distance by starting at its center point and walking along the bound mesh surface to find hair strand CVs. Hair strand CVs are assigned a falloff value depending on how far away they are from the center point. Use Surface in the following situations:
  • The grooming tool is set to Global mode, meaning when groups of hair strands are being edited as opposed to the CV along individual hairs.
  • When you want the grooming tool to conform to a surface.
  • When grooming curly hairs or when there are many overlapping hairs.

Use this falloff type

The Comb, Grab, and Noise brushes do not have Surface falloff.

Falloff curve

Controls the profile (cross-section) of brushes. The falloff curve determines how the tool strength diminishes from the center towards its outer edge.

Snap to Grid

Constrains points to the Falloff curve grid.

Reset Curve

Resets the falloff curve to its default shape.

Save Custom Curve

Saves the current falloff curve to the Custom Curve presets in the Tool Settings.

Preset Curve

Lets you quickly set the Falloff curve by selecting from frequently used shapes.

Custom Curve

Lets you quickly set the Falloff curve by selecting from custom shapes.

Ctrl-click a custom curve image to delete it.

Volume Search Radius

Specific to brushes with Falloff Type set to Volume. Sets the radius of the region around the brush center that is used to locate the hair CV closest to the edge of the brush radius. This value is a percentage of the brush radius. Larger values increase the sampling size of volume selection and provide better overall results, but reduce the sampling accuracy, meaning the volume center is further from the camera. The default value is 0.25.

Volume Center Offset

Specific to brushes with Falloff Type set to Volume. Lets you adjust the distance between the volume center and the camera. Positive values increase this distance, while negative values reduce it.

Offset Hotkey Interval

Specific to brushes with Falloff Type set to Volume. Sets the amount of offset applied to the volume each time the offset hotkey is pressed.

Filter Back Faces

When on, hairs on back-facing polygons are not affected by the brush strokes.

Back Face Cutoff Angle

Controls the angle of the back-face filtering. For example, when set to the default value of 90, hairs on faces that face over 90 degrees away from the camera are not affected by the brush strokes.

Falloff Start Angle

Determines the angle where the falloff starts to reduce the effect of the brush.

Overall Color Intensity

Controls the strength of the color overlay for color feedback, including Falloff and Preselection Highlight colors.

Brush Falloff Color

When on, color feedback indicates the falloff region of the brush stroke based on the selected Brush Falloff Curve. Use the falloff color ramp to set how the falloff curve maps to the affected hairs.

Falloff Color

Color ramp that specifies how the falloff color feedback displays.

Preselection Highlight

When on, hairs affected by the brush are highlighted before you begin sculpting. Click the Color swatch or use the slider control to change the highlight color.

Root to Tip Magnitude Control

When on, you can specify how the brush applies its effect along the length of the hairs from root to tip. The magnitude of the brush's effect is represented as a curve that can be edited, where far left point represents the hair root and far right point represents the hair tip.

Enable these settings to increase the control and accuracy of the brush's effect.

The Root to Tip Magnitude Control Curve has the same controls and works simular to the Brush Falloff Curve. See the falloff curve settings above.