Fractal Noise Weightmap
Updated: 10 Feb 2025
Generates a weightmap from a 3D fractal noise
Fractal Noise Weightmap
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 core behaviours of the node.
Parameter Details Apply Mode
Choose whether the deformer applies to the individual vertices or the mesh chunks.
- Vertices : The mesh deformations are applied to the mesh vertices.
- Chunks : The mesh deformations are applied to the separated mesh pieces.
Mode
The mode by which the value is generated.
- Turbulence : Weights are defined using turbulence / fbm noise.
- Turbulence : Weights are defined using cellular noise.
Per-Polygon Weightmap
Determines whether the weightmap should specify a value per-polygon or per-vertex.
Input Channel
The 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 Scale
Scale the size of the generated fractal noise.
Noise Lacunarity
How large the gaps between larger areas of noise are.
Noise Gain
The overall smoothness of the generated fractal noise.
Noise Octaves
How many time the noise generation is iterated.
Gain
Scale the generated value.
Offset
Offset the generated value.
Sharpness
Ramps the sharpness of the generated value to a power.
Min Value
Limit the minimum value generated.
Max Value
Limit the maximum value generated.
Invert
Invert the generated weightmap values.
UV Scale X
Scale the uv texture along the x axis.
UV Scale Y
Scale the uv texture along the y axis.
UV Offset X
Offset the uv texture along the x axis.
UV Offset Y
Offset the uv texture along the y axis.
Show Weightmap
Visualise the weightmap as vertex colours on the source geometry
These properties control where the deformer affects the geometry.
Parameter Details Enabled
Enable falloff from the position of the deformer.
Shape
Select which shape to use to draw falloff from.
- Sphere : Falloff is drawn outward from a central point, forming a spherical falloff.
- Cylinder : Falloff is drawn outward from a line, forming a cylindrical falloff.
- Plane : Falloff is drawn outward from a plane.
Shape Orientation
Along which axis the shape should be drawn.
Outer Range
The outer range from which the falloff is calculated from.
Inner Range
The inner range from which the falloff is calculated from.
Curve Power
How quickly the falloff drops to 0 at the outer falloff.
Inputs
These properties control the core behaviours of the node.
| Parameter | Details |
|---|---|
| Apply Mode |
Choose whether the deformer applies to the individual vertices or the mesh chunks.
|
| Mode |
The mode by which the value is generated.
|
| Per-Polygon Weightmap | Determines whether the weightmap should specify a value per-polygon or per-vertex. |
| Input Channel |
The input values from the mesh used to define the positions for the fractal noise.
|
| Noise Scale | Scale the size of the generated fractal noise. |
| Noise Lacunarity | How large the gaps between larger areas of noise are. |
| Noise Gain | The overall smoothness of the generated fractal noise. |
| Noise Octaves | How many time the noise generation is iterated. |
| Gain | Scale the generated value. |
| Offset | Offset the generated value. |
| Sharpness | Ramps the sharpness of the generated value to a power. |
| Min Value | Limit the minimum value generated. |
| Max Value | Limit the maximum value generated. |
| Invert | Invert the generated weightmap values. |
| UV Scale X | Scale the uv texture along the x axis. |
| UV Scale Y | Scale the uv texture along the y axis. |
| UV Offset X | Offset the uv texture along the x axis. |
| UV Offset Y | Offset the uv texture along the y axis. |
| Show Weightmap | Visualise the weightmap as vertex colours on the source geometry |
These properties control where the deformer affects the geometry.
| Parameter | Details |
|---|---|
| Enabled | Enable falloff from the position of the deformer. |
| Shape |
Select which shape to use to draw falloff from.
|
| Shape Orientation | Along which axis the shape should be drawn. |
| Outer Range | The outer range from which the falloff is calculated from. |
| Inner Range | The inner range from which the falloff is calculated from. |
| Curve Power | How quickly the falloff drops to 0 at the outer falloff. |
| Name | Description | Typical Input |
|---|---|---|
| Falloff Node | Use an input node to control the transformation values of the falloff. | Null |
| Generated Weightmap | Add a weightmap to vary the strength of the deformer across the surface. | Generate Weightmap |
| Transform Modifiers | Apply the transforms of another node to this node. | Null |
| Target Node | Modifiy the rotations of the node to always direct the z axis towards the input. | Null |
| Local Transform Override | Apply the transforms of another node to this node, relative to its parent. | Null |