Node references

This page gives you a reference for the attributes of Wig nodes.

FurNode attributes

Attribute	Description
Groom
Groom File Path	The path to the groom file for the fur sets.
Lock groom for animation	Lock the groom for animation. You cannot edit the groom when it is locked.
Store Groom Positions in Memory	Whether to cache the groom positions.
Groom File Compression Level	The amount of compression to use for the groom file. Higher compression levels are smaller on disk but take longer to open.
Animation	The settings here are only available when the groom is locked.
Transform Strands	If this is on, strands transform if the underlying geometry is moved, scaled, or rotated.
Wrap Strands To Surface	When enabled, strands stick to the underlying geometry if it deforms.
Update Files
Update File Path	Sets the path for files produced.
Update File Compression Level	The amount of compression to use for the animation files. Higher compression levels are smaller on disk but take longer to open.
Update File Format Version	Sets the update file version. Don’t change this unless you know what you’re doing.
Advanced
Time Source	Controls where to find the time value for which frame Wig is calculating for. One of: Timeline: use the Maya timeline Plug: use the plug-in selected (update file, WCF file, Bake file, etc)
Fraction of Strands	The fraction of strands within the file to update. At 1, all strands are updated. At 0.5, only 50% of the strands are updated, etc.
Write Visible Strands Only	Forces Wig to discard any disabled or invisible strands. (When you paint density, Wig doesn't remove strands: it just marks them disabled or invisible but still writes them to the .wg file.)
Growth and Density
Growth Is Enabled	Select this to allow new strands to grow in response to any changes to the model. If this is not selected, the furset cannot grow any new strands.
Seed	The seed for the hair generation algorithm. Change this to generate new hair with your current settings.
Jitter	This adds some noise when generating new hairs, so the strands aren’t all the same length. Set this to the maximum amount that the new hair length can jitter, as a percentage of the length. So if this is set to 0.5, new hairs can vary in length by up to 50% of the set length.
Neighbors	New hairs inherit their shape from the hairs around them. This sets how many of the neighboring hairs Wig considers when generating the initial hair shape.
Preserve Length	When a strand is reshaped using the shapes of its neighbor strands, this sets whether the strand should keep its original length.
Master Density	The master density for your furset. All the other density settings are relative to this amount. The actual hair density at a point on the surface is this value multiplied by the density map (refer to Paint hair attributes as maps).
Growth Density Scale	The hair density to show on the groom, relative to the Master Density (that is, at 1.0, this is the same as the master density, at 0.5 it’s 50%, and so on).
Render Density Scale	The actual density of the hair in the fur set when PRMan renders it, relative to the Master Density.
Display Density Scale	The onscreen display density of the hair in the fur set, relative to the Master Density. This only controls how the fur set displays on screen, not how it renders (which is set in the Render Density Scale).
Strands
Width	The width for each individual hair.
Tip Scale	The width at the tip of the hair, relative to the root.
Tip Scale Offset	The distance along each hair that it starts changing width (to the scale set in the Tip Scale). For instance, if this is set to 0.5 and Tip Scale is 0.8, then the width stays the same for the bottom 50% of each strand, and then narrows to 80% of the root width at the tip.
CVs per strand	The number of vertices on each strand of hair. The more vertices, the smoother the curve of the hair.
Root Ext. Num Segments	The number of segments used in the root extensions: which extend the strands below the skin surface. 0 means extensions are disabled.
Root Ext. Length	The length of the root extensions: 0 means the extensions are disabled. Currently this value is shared by all strands.
Root Ext. Min Angle	By default the root extensions grow in the direction of the follicle tangent. This setting ensures that the angle between the grow direction and the surface normal does not exceed a given value.
Drawing
Drawing Enabled	Draws the hairs themselves. If this off, you do not see the hairs in Maya. If this is off for all fur sets grown from a subdivision surface, Wig does not load the fur for that subd surface. This dramatically speeds up Maya performance.
Rendering Enabled	Allows the hairs to render. If this is off, you do not see the hairs in renders.
Draw Convex Hull	Draws the hairs using convex hulls.
Draw Frames	Draws the framing elements for the hairs: lines showing the X and Y axes at each vertex on the hair.
Draw Vertices	Shows the connecting vertices on the hair as dots.
Draw Sub Divided F1	Shows the underlying subdivision surface that the hair grows from.
Draw Tangents	Shows the tangent (that is, the direction the segment “points”) at each vertex on the hairs. You can change the scale of the lines shown in the Draw Tangent Scale field.
Draw Root Extensions	Shows the root extensions if they are enabled.
Draw Selection	Shows highlighting on the selected hairs.
Draw Tangent Scale	The length of the tangent lines displayed at the hair vertices. Only used if Draw Tangents is on.
Display Root Colour	The color to display the roots of the hair onscreen when in the default render mode.
Display Tip Colour	The color to display the tips of the hair onscreen when in the default render mode.
Is Coloured	Use this if you are going to be using the color tool.
Hide Edges Per Strand	The number of vertices on each strand of hair to hide onscreen. For example, if each strand has 20 vertices and this is set to 10, you only see half the length of the hair onscreen.
Display Property	Which property of the hairs is displayed: StrandColour: Wig shows the hairs with their assigned colors. IsSeparated: Wig colors the hairs to display whether the hairs are separated or not. CanDeform: Wig colors the hairs according to whether they can deform or not. StrandIndex: Wig colors the hairs according to their index values (from dark green at 0 to bright green at max value). This is useful as a way of visualizing how distributed the strands are over the surface, especially on grooms imported from other studios (where hairs may be distributed differently). DensityScale: Wig shows the hairs colored according to their density scale. Flexibility: Wig colors the hairs according to their flexibility. RootSubDTextureUv Wetness: Wig shows the hairs colored according to their current wetness values. WidthScale: Wig shows the hairs colored according to their width scale.
Strand Filter	If the Display Property is set to index filter, this is the number of the strand to display. If this is set to -1, it’s ignored.
Show Strands in Maya/Render	If this is on, Wig shows the hair strands within the Maya or Render UI.
Shading
Surface
Surface Shading Enabled	Turn this on to view the surface shading.
Colour	The surface color for the growth surface.
Backface Colour	The color for the back of the growth surface.
Shadow Weight	How strong the shadows on the surface are.
Fur	Refer to Setting onscreen render properties within Wig for details on using the settings in this section.
Fur Shading Enabled	Turns on the fur color rendering.
Enable Multisample Anti-aliasing	Turns on the anti-aliasing for the onscreen hair render. Anti-aliasing gives a better result but can slow down the onscreen render.
Disable MSAA for Rotate/Pan/Zoom	Turns anti-aliasing off when moving the view. If this setting is off, Wig calculates the anti-aliasing constantly as you move the view.
Enable Width Preview	Turns on the width preview. If this is off, Wig shows hairs as being a single pixel wide, and does not change this with different zoom levels. If this is on, Wig shows the hair at the appropriate size in world space. When you’re zoomed right in, the hairs look thicker; when zoomed right out, some hairs become thinner than a pixel and thus aren’t displayed.
Disable Width for Rotate/Pan/Zoom	Turns off the width preview when moving the view. Turn this off to speed Wig up when moving the view.
Enable Tip Scale Preview	Turns on the tip scale preview. If this is off, Wig shows hairs as staying the same width all along the length of the strand. If this is on, Wig shows the effects of the hair tip scaling (as set in Tip Scale, above).
Disable Tip Scale for Rotate/Pan/Zoom	Turns off the tip scaling when moving the view. Turn this off to speed Wig up when moving the view.
Colouration
Color Source	How to calculate the hair color. Either Melanin (hair color is based on the amount and type of melanin in the hair) or Absorption (hair color is based on the color and amount of light it absorbs). Use Melanin unless you have a good reason.
Melanin Mix	The ratio of eumelanin (browner) to pheomelanin (redder) in the hair. For example, at 0.8, 80% of the melanin in the hair is eumelanin.
Melanin Density	The amount of melanin in the hair.
Absorption Coefficient	When the color is coming from absorption, this sets the color the hair absorbs. The hair appears to be the chromatic opposite of the selected color, as it absorbs the light of that color. For example, if you set the absorption color to bright red, the hair appears blue.
Medulla Ratio	The size of the medulla (hollow space at the core of the hair) for the hairs. Higher ratios make the hair lighter and affect how light moves through the hair.
Specular
Longitudinal Shift
Alpha R	Sets the amount that the hair’s surface refracts light. This affects how much the reflected light (R) diverges from the transmitted/reflected/transmitted light (TRT), as the TRT light gets twice the amount of additional refraction. At 0 (a smooth surface) the two kinds of light are basically on top of each other. As the value gets lower, they move apart.
Longitudinal Width	Sets how much the surface roughness on the hair causes each type of light to spread out (diffuse).
Beta R	How much the R (reflected) light diffuses from the surface. Lower values give tighter highlights, higher values are more diffuse.
Beta TT	How much the TT (transmitted-transmitted) light diffuses from the surface. Lower values give tighter highlights, higher values are more diffuse.
Beta TRT	How much the TRT (transmitted-reflected-transmitted) light diffuses from the surface. Lower values give tighter highlights, higher values are more diffuse.
Advanced
Use OSM Bilinear	Renders using a bilinear calculations. This gives you slightly better shading, and doesn’t make much difference to the render calculations.
Disable OSM Bilinear for Rotate/Pan/Zoom	Turns off OSM bilinear when moving the view. Use this to use OSM bilinear while being sure it’s not impacting on your render performance.
Use Spherical Gaussian	Use a spherical gaussian calculation when rendering. If this is on, you get a result much closer to the final PRMan render, but it takes longer to render. Turning this off makes Wig render the scene much faster onscreen.
Fragment Output	What data to use when rendering the hair. Colour renders the hair color, NumHairs shows the number of hairs occluding each other, DirectFraction shows the ratio of direct to indirect light affecting the hair (direct light shown as white amount in the display).
Device Type	Sets where on your PC Wig does the render. Wig is optimized to work on a GPU.
Direct
use R	Display the R (reflected) direct light.
use TT	Display the TT (transmitted-transmitted) direct light.
use TRT	Display the TRT (transmitted-reflected-transmitted) direct light.
use FBack	Display the FBack direct light.
db	The amount of FBack light to apply. This adds most of the color to the hair.
Indirect
use R	Display the R (reflected) indirect light.
use TT	Display the TT (transmitted-transmitted) indirect light.
use TRT	Display the TRT (transmitted-reflected-transmitted) indirect light.
use FBack	Display the FBack indirect light.
db	The amount of FBack light to apply. This adds most of the color to the hair.
Arnold
Shader	The shader to use for Arnold rendering.
Matte	When enabled, render with no reflection; that is, a matte surface.
Opaque	When enabled, render without transparency.
Self Shadows	When enabled, respond to self-shadowing.
Rendering
UV Set Name	Sets the name for the UV set for the underlying surface.
Curve Interpolation	The interpolation algorithm to use for curves. Either cubic or linear.
Ribbons	Turn this on to be able to render hair as ribbons.
Min Groom Hair Length	Sets the minimum length for hairs to render. Any hairs shorter than this are not rendered.
Optimizations
CV Reduction
CV Step	Use this to reduce the CVs per strand at render time. At 1, Wig uses every CV when rendering. At 2, it uses every second CV (halving the number of CVs); at 3, it uses every third CV, and so on.
Fuzz
Fuzz On	Turns on the Fuzz Optimization render mode. This discards any strands on the main part of the model, only displaying the strands around the silhouette. This is for grooms intended to add ‘fuzz’ texture to objects, where the visible edges are the most important.
Fuzz Profile	The falloff for the fuzz. Higher values show more strands near the silhouette, lower values show less (sharper falloff).
Level of Detail
Lod On	Turns on the Level of Detail rendering mode (aka stochastic pruning). If this is on, the further away an object is, the fewer hairs are rendered. Turn this on to speed renders up.
Lod Threshold Area	The number of onscreen pixels below which Level of Detail pruning occurs. If the area of hair is smaller than this onscreen, pruning occurs during render.
Lod Aggressiveness	How quickly to prune the hairs as the distance from camera increases. Lower values make the pruning ease in slower.
Lod Conservation	The absolute minimum proportion of hairs to render, no matter how far from the camera the furset is.
Lod Max Scaling	The maximum amount LOD can scale the hair down.
Lod Max Transition	The maximum extent that the LOD scaling can apply.
Super-Fibre
Super Fibre On	Super Fibre is an effect to make each strand look like multiple strands of hair. Use this to mimic the effect of a denser fur set.
Super Fibre Width Scale	How many strands each individual strand should appear as. For example, if this is set to 7, each strand has the appearance of being seven strands.
Peripheral Reduction
Peripheral Reduction Mode	How wig should handle strands that are out of the viewing frustum. One of: Off: strands out of view are handled normally. Cull - remove the strands that are out of the viewing frustum. Superfibre: convert strands out of the viewing frustum to super-fibre.
Peripheral Reduction CVStep	When using peripheral reduction, this sets the step factor for the CV reduction. For instance, if this is set to 3, Wig uses every third CV and ignores the two in between.
Peripheral Reduction Margin	The shortest strand length that peripheral reduction can apply to.
Back-face Reduction
Back Face Reduction Mode	How Wig should handle strands that are on back faces (that is, areas on the model that face away from the camera). One of: Off: strands on back faces are handled normally. Cull - remove the strands on back faces. Superfibre: convert strands on back faces to super-fibre.
Back Face Reduction CVStep	When using back face reduction, this sets the step factor for the CV reduction. For example, if this is set to 3, Wig uses every third CV and ignores the two in between.
Back Face Reduction Angle	The angle away from the camera that is considered to be a “back face”. The default is 45, so any surface more than 45 degrees from the camera is a back face.
Primvars	Select all the primvars to generate when rendering.
Ancestor Groom File Path	Path to an alternate groom file, where Wig can get data for these primvars: uniform color __Cref uniform color __CrefBase uniform float groomHairLength uniform float worldToTextureSpaceFaceAreaRatio vertex float localDensity vertex vector localDensityGradient
Stats
Full Stats On	Turn this on to record Wig statistics.
Hacks
Render with Recycled UVs	When rendering, map any strands created since the last calcSH pass to existing strands. This prevents black lines appearing in the render when you are reusing a calcSH pass. This is a short-term solution intended for lookdev.
Root CV Offset Scale	When rendering, moves the root CV of the hairs out along the surface normal by the scale set. Use this to move the hairs out from under the surface.
Skip First Edge	When rendering, skip the first edge encountered for each hair.
Retraction	This function retracts the hairs into the skin. At 0, the strands have their full length; at 1, they have entirely retracted into the skin. We have used this previously to animate hair “growing” out of the skin.
Bounding Box Expansion	This enlarges the bounding box for the fur. Use this if the bounding box ends up too small to contain all the hair geometry. For example, if renders seem to suddenly get cut off at the edge of the (too small) bounding box.
Advanced
Ignore Time	Turn this on to make Wig ignore the timeline.
Shape Resizing Scale	Scale factor to apply when resizing strands.
Width Resizing Scale	Scale factor to apply when resizing strand width.
Flow
Flow from Strand Blur	If this is on, Wig creates a flow map from the hair movement. This has been used to create shaders that mimic the effects of a horse’s mane without actually having to draw all the hairs.
Collision
Intersectors
Cache Mode	Live Intersect Only - Wig only applies the intersections from the current frame. When you move to the next frame, the intersections reset (all hairs return to their original length). Live Intersect and Collect Cache: Wig collects and caches the intersections from the current frame. Apply Cache Only: Wig ignores the intersectors in the current frame and only applies the cached intersection data. Live Intersect and Apply Cache: Wig applies the cached intersection data and also calculates intersections for the current frame.
Min Strand Length	The minimum length that the strand can be set to by an intersection.
Max Strand Length	The maximum length that the strand can be set to by an intersection.
Strand Deform State	Set which strands can be affected by the intersector. One of Any (all strands can be affected), Only Deforming, or Only Not Deforming.
Strand Reroot State	Set which strands can be affected by the intersector. One of Any, Only Re-rooting, Only Not Re-rooting.
Cut	Set this to allow the strands to be cut by the intersection.

ClumpToolNode attributes

Attribute	Description
Clump Controls
Free All Sets	Turn this on to preserve any clump changes to the hairs if you delete the clump node. Turn this off to see the hair without the influence of the clump.
Freeze Active Set	Turn this on to preserve clump effects to the clumps in the active clump set. Turn this off to see the hairs without the influence of the active clump set.
Color	Whether to use the clump color scheme or a custom color set. This controls the color scheme used for clumped hairs: this is only a visual guide to help show the clump effects, it does not affect the final rendered hair. Choose from: originalColor to turn the color coding off. clumpedColor to use the clump color coding (this is the default). customColor to use a custom color scheme, as set in the Root Color and Tip Color below.
Root Color	If you are using a custom color scheme for your clumped hairs, this sets the color at the root of the clumped hairs.
Tip Color	If you are using a custom color scheme for your clumped hairs, this sets the color at the tip of the clumped hairs.
Unbound strands	Turn this on to toggle display of strands unaffected by the clump.
Flat Clumping Controls
Fix Length	If on, this forces clumped hairs to keep their current length. If off, the clump pulls the hairs so the ends of the clumped hairs are at the same level as the clump guide curve.

ClumpCurveSetNode attributes

Attribute	Description
Clump ActiveID	Shows the ID of the active clump set.
Clump Trim	Refer to Set the clump trim for details on using this.
Trim	Turns on the clump trim, preventing hair overshoot.
Trim Percentage	Sets the maximum length that the hairs can be randomly trimmed to, as a ratio to current length: Any value other than 0 or 1 sets the maximum length to trim to. For example, 0.5 trims strands up to 50% of the original length, 0.8 trims up to 80% of original length, etc. At 0, hairs can be trimmed up to their entire length. At 1, any overshooting strands are trimmed just enough to remove the overshoot. There is no randomization.
Clump Volume	Refer to Set the clump volume for details on using this.
Compensate Volume	If this is on, Wig tries to preserve the original hair volume. If this is off, the hairs follow the clump curve more exactly.
Clump Weight Control	Refer to Define the clump shape for details on using this.
Clump Weights 1	Sets the first clump profile. Use the spline controls to set the shape of the clumped hairs.
Clump Weights 2	Sets the second clump profile. Use the spline controls to set the shape of the second group of clumped hairs. If you only want to use a single clump profile, ignore this.
Clump Weight Seed	Seed number for the random selection between the two clump weights. To change the random distribution, change this value.
Clump Random Threshold	Sets the distribution between the two clump weight profiles. This sets the chance that a clump uses Clump Weight 2; for example, if this is set to 0.2, 20% of the clumps use Clump Weight 2, and the rest use Clump Weight 1.
Spline Weights	This controls how much each part of the strand is affected by the clump strength. This acts as a multiplier on the clump weight. So in an area where the spline weight is 0.5, the clump force applies at half strength. Where the spline weight is 0.75, the clump force applies at 75% strength.
Clump Twist	Refer to Twisting your clumps for details on using this.
Twist	The (absolute) amount to twist the clumped hairs. Set this in degrees, up to 720 (two full twists).
Over Shoot Threshold	Sets the tolerance for length change when calculating the twist. Hairs that would end up shorter than this scale can “overshoot” to a negative twist (that is, twist around). For example, if this is set to 0.3, any hairs that would end up shorter than 30% of the original length can “overshoot” to a negative twist. If this is set to 1, all clumped strands that would be shorter than their original lengths use a negative twist angle if this would result in a longer strand. If this is set to 0, all clumped strands only use the angle set in the Twist field.
Randomize Twist	Turn this on to use a random twist value.
Random Twist Seed	Seed value for the random twist generation. To change the random clump twisting, change this value.
Twist Scale Min	Maximum twisting scale to use when generating random twist values.
Twist Scale Max	Maximum twisting scale to use when generating random twist values.
Clump Eccentricity	Refer to Adding eccentricity for details on using this.
Use Eccentricity	If this is on, Wig adds eccentricity to the clumped hairs.
Random Seed	Seed value for any randomization in use.
Mirror	If this is on, Wig generates a random value between the set minimum/maximum and its inverse. For example, if Mirror and Randomize Wave Length are on and the Wave Length Min is 0.5 and Max is 0.8, wmWig randomizes the value between 0.5 and 0.8, and -0.5 and -0.8. It does not select a value between -0.5 and 0.5.
Effect	This is a multiplier on the eccentricity force: at 50, the eccentricity applies at 50% strength.
Randomize Wave Length	Turn this on to randomize the wavelength added.
Wave Length Min	The minimum length of the wave to add to the hair.
Wave Length Max	The maximum length of the wave to add to the hair.
Randomize Amplitude	Turn this on to randomize the amplitude of the wave to add to the hair.
Amplitude Min	The minimum amplitude to add to the hair.
Amplitude Max	The maximum amplitude to add to the hair.
Eccentricity Opacity	This controls the amount of interpolation Wig applies to the strand shapes before and after applying the eccentricity. Use the spline controls to set how much interpolation to use along the strands.

GuideCurveDeformerNode attributes

Attribute	Description
Maya Live	Turn this on to have the guide curve deformer apply within Maya.
Prman live	Turn this on to have the guide curve deformer apply in PrMan.
Envelop
Debugging
Strand Filter	Turn this on to filter by a particular strand.
Binding Strands	Turn this on to highlight the strands in the initial bind pose.
Binding Nurbs	Turn this on to highlight the NURBS guide curves for the initial bind pose.
Binds	Turn this on to highlight the bindings to the guide curves.
Current Strands	Turn this on to highlight the strands bound to the guide curves.
Current Nurbs	Turn this on to highlight the NURBS guide curves for the current pose.
Show Clump	Turn this on to highlight the clump groups.
Curves Follow Surface	Turn this on to have curves follow the surface as normal.If this is off, the curves no longer follow the surface in Maya when deforming. The curves still follow the surface when binding or rendering.
Clumps
Clump Preservation	Use the spline area to define the force helping to preserve the clump shape, from the bottom of the hairs (at the left) to the top (at right). For example, if the value halfway along (that is, Selected Position is 0.5) is 0.8, then Wig applies 80% of the force to preserve the clump shape at the point halway along the hairs.
Clump Sensitivity	The clumping force used.
Advanced
Wetness
Wetness Bias	The amount that the wetness affects the hairs.
Wetness Power	The strength of the wetness force.
Wetness Short Length	Sets the minimum point on the hairs that the wetness applies. For example, if this is set to 0.2, the wetness applies from 20% of the strand length.
Wetness Long Length	Sets the maximum point on the hairs that the wetness applies.
Wetness Scraggle Power	How likely the wetness is to deform the hairs.
Expanded Binding
Expanded Binding Radius	How far around each hair Wig looks to find guide curves that can affect it. Refer to Expanding binding and smoothing.
Expanded Binding Count	The maximum number of additional guide curves that can affect the hair
Expanded Binding Power	The force applied by the additional guide curves
Expanded Binding Key	Whether the force from the additional bindings applies at the root or tips of the strands.
Smoothing
Smoothing Radius	How far around each hair Wig looks to find guide curves to consider when smoothing.
Smoothing Count	The maximum number of additional guide curves that can affect the hair
Smoothing Power	The smoothing force applied by the additional guide curves
Smoothing Key	Whether the force from the additional bindings applies at the root or tips of the strands.

BraidNode Attributes

Attribute	Description
Braid Controls
Show Strands	Select this to display a preview of the strands within the braid.
Show Hull	Show the hull, a very precise bounding box around the curve.
Braid Size	The size of the braid as a whole (that is, all the strands put together).
Strand Size	The size of each strand within the braid. If this is set too low, you may get gaps between the strands.
Strand Angle	How much the crossovers within the braid are angled (that is, how tight the braid is).
Strand Flatten	How much the strands within the braid flatten out under pressure. At 0, the strands are all circular. As you increase the value, the braids flatten out more.
Tail Scale	Defines how much the braid tapers towards the end. From 0.1 to 1, where 1 means that the braid is the same size at the tip as at the start, and 0.1 meas the tip is 10% of the start size.
Squeeze
Selected Position	The distance along the braid that this control point is at. 0 to 1, with 0 at the start of the braid at 1 at the end.
Selected Value	The ratio of the overall width of the braid at this control point. From 0 to 1; at 1, this is the full braid width as set in the Braid Size, at 0, this tapers to nothing.
Interpolation	How the falloff line between this control point at the next point to the right is calculated. One of: None — there is no further falloff, and the current value applies for the rest of the falloff ramp. Linear — the falloff is a straight line between this control point and the next. Smooth — the falloff is a smooth curve between this point and the next, taking the overall shape of the ramp into account. Spline — the falloff is a smooth curve between this point and the next, based on a spline.