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 3D transforms of the node. Transforms will generally be inherited by child nodes, although they can be ignored through the Inherit Transform Channels attributes.
Parameter Details Position X The objects position along the local x-axis.
Position Y The objects position along the local y-axis.
Position Z The objects position along the local z-axis.
Rotation Heading The objects rotation around the local y-axis.
Rotation Pitch The objects rotation around the local x-axis.
Rotation Bank The objects rotation around the local z-axis.
Scale X The objects scale along the local x-axis.
Scale Y The objects scale along the local y-axis.
Scale Z The objects scale along the local z-axis.
Control the inheritance of the transforms from the parent.
Parameter Details Position Toggle inheritance of the Position from the parent.
Rotation Toggle inheritance of the Rotation from the parent.
Scale Toggle inheritance of the Scale from the parent.
World Position Only Inherit the world position from the parent only, rotation and scale will be ignored. Overrides above properties.
Inherit Time Toggle inheritance of time from the parent.
These properties control the core behaviours of the node.
Parameter Details Vertex Source Mode How 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.
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 Use Falloff Enable falloff from the position of the deformer.
Falloff Shape Select 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 Range Limits the range the deformer is effective at.
Falloff Inner Range The inner range from which the falloff is calculated from.
Falloff Curve Power How quickly the falloff drops to 0 at the outer falloff.
Invert Falloff Invert the direction of the falloff.
Falloff Curve Visualises the falloff curve, from being completely in effect to no longer effective.
Inputs
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.
| Parameter | Details |
|---|---|
| Position X | The objects position along the local x-axis. |
| Position Y | The objects position along the local y-axis. |
| Position Z | The objects position along the local z-axis. |
| Rotation Heading | The objects rotation around the local y-axis. |
| Rotation Pitch | The objects rotation around the local x-axis. |
| Rotation Bank | The objects rotation around the local z-axis. |
| Scale X | The objects scale along the local x-axis. |
| Scale Y | The objects scale along the local y-axis. |
| Scale Z | The objects scale along the local z-axis. |
Control the inheritance of the transforms from the parent.
| Parameter | Details |
|---|---|
| Position | Toggle inheritance of the Position from the parent. |
| Rotation | Toggle inheritance of the Rotation from the parent. |
| Scale | Toggle inheritance of the Scale from the parent. |
| World Position Only | Inherit the world position from the parent only, rotation and scale will be ignored. Overrides above properties. |
| Inherit Time | Toggle inheritance of time from the parent. |
These properties control the core behaviours of the node.
| Parameter | Details |
|---|---|
| Vertex Source Mode | How vertexes are selected to be used by the deformer.
|
| 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 |
|---|---|
| Use Falloff | Enable falloff from the position of the deformer. |
| Falloff Shape | Select which shape to use to draw falloff from.
|
| Falloff Range | Limits the range the deformer is effective at. |
| Falloff Inner Range | The inner range from which the falloff is calculated from. |
| Falloff Curve Power | How quickly the falloff drops to 0 at the outer falloff. |
| Invert Falloff | Invert the direction of the falloff. |
| Falloff Curve | Visualises the falloff curve, from being completely in effect to no longer effective. |
| Name | Description | Typical Input |
|---|---|---|
| Image | The image that is sampled when the mode is set to “Texture”. | Loader |
| 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 |