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Fractal Noise Weightmap

Fractal Noise Weightmap

Updated: 10 Feb 2025

Generates a weightmap from a 3D fractal noise

image

Example .dfx

Method #

This node uses fractal noise to generate per-vertex or per-polygon weightmap for the parent mesh. These can then be used to vary the strength of Deformers on the parent mesh.

The output from this node is a vertex weightmap which is unique to the parent mesh, so can’t be used to influence other meshes.

Node placement is important! Weightmaps are generated following the deformer processing stack, so make sure to place the weightmap at some point before the deformer its applied to.

Parameters

These properties control the 3D transforms of the node. Transforms will generally be inherited by child nodes, although they can be ignored through the Inherit Transform Channels attributes.

ParameterDetails
Position XThe objects position along the local x-axis.
Position YThe objects position along the local y-axis.
Position ZThe objects position along the local z-axis.
Rotation HeadingThe objects rotation around the local y-axis.
Rotation PitchThe objects rotation around the local x-axis.
Rotation BankThe objects rotation around the local z-axis.
Scale XThe objects scale along the local x-axis.
Scale YThe objects scale along the local y-axis.
Scale ZThe objects scale along the local z-axis.

Control the inheritance of the transforms from the parent.

ParameterDetails
PositionToggle inheritance of the Position from the parent.
RotationToggle inheritance of the Rotation from the parent.
ScaleToggle inheritance of the Scale from the parent.
World Position OnlyInherit the world position from the parent only, rotation and scale will be ignored. Overrides above properties.
Inherit TimeToggle inheritance of time from the parent.

These properties control the core behaviours of the node.

ParameterDetails
Vertex Source ModeHow vertexes are selected to be used by the deformer.
  • Vertex Positions : Vertexes are chosen based on their positions in the scene.
  • Chunks : Vertexes are chosen based on the enclosed section of the mesh they are used.
ModeThe mode by which the value is generated.
  • Turbulence : Weights are defined using turbulence / fbm noise.
  • Turbulence : Weights are defined using cellular noise.
Per-Polygon WeightmapDetermines whether the weightmap should specify a value per-polygon or per-vertex.
Input ChannelThe input values from the mesh used to define the positions for the fractal noise.
  • Position : The vertex positions are used.
  • UV : The vertex texture coordinates are used.
Noise ScaleScale the size of the generated fractal noise.
Noise LacunarityHow large the gaps between larger areas of noise are.
Noise GainThe overall smoothness of the generated fractal noise.
Noise OctavesHow many time the noise generation is iterated.
GainScale the generated value.
OffsetOffset the generated value.
SharpnessRamps the sharpness of the generated value to a power.
Min ValueLimit the minimum value generated.
Max ValueLimit the maximum value generated.
InvertInvert the generated weightmap values.
UV Scale XScale the uv texture along the x axis.
UV Scale YScale the uv texture along the y axis.
UV Offset XOffset the uv texture along the x axis.
UV Offset YOffset the uv texture along the y axis.
Show WeightmapVisualise the weightmap as vertex colours on the source geometry

These properties control where the deformer affects the geometry.

ParameterDetails
Use FalloffEnable falloff from the position of the deformer.
Falloff ShapeSelect which shape to use to draw falloff from.
  • Sphere : Falloff is drawn outward from a central point, forming a spherical falloff.
  • Cylinder - X/Y/Z : Falloff is drawn outward from a line, forming a cylindrical falloff.
  • Plane - X/Y/Z : Falloff is drawn outward from a plane.
Falloff RangeLimits the range the deformer is effective at.
Falloff Inner RangeThe inner range from which the falloff is calculated from.
Falloff Curve PowerHow quickly the falloff drops to 0 at the outer falloff.
Invert FalloffInvert the direction of the falloff.
Falloff CurveVisualises the falloff curve, from being completely in effect to no longer effective.

Inputs

NameDescriptionTypical Input
ImageThe image that is sampled when the mode is set to “Texture”.Loader
Falloff NodeUse an input node to control the transformation values of the falloff.Null
Generated WeightmapAdd a weightmap to vary the strength of the deformer across the surface.Generate Weightmap
Transform ModifiersApply the transforms of another node to this node.Null
Target NodeModifiy the rotations of the node to always direct the z axis towards the input.Null
Local Transform OverrideApply the transforms of another node to this node, relative to its parent.Null