Primitive Weight
Updated: 15 Jan 2026
Generate particle weight values using 3D primitive shapes.
Primitive Weight
Method #
This node generates particle weights based on 3D primitive shapes.
You can generate instances of this node by connecting a transform array into the "Transform Array" input, much like you can with a normal 3D primitive. Allowing you to create more complex particle weight shapes.
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 Primitive Type
Choose which 3D shape to generate the weight with.
- Box : Use a box as the weight generator shape.
- Cylinder : Use a cylinder as the weight generator shape.
- Sphere : Use a sphere as the weight generator shape.
- Plane : Use a plane as the weight generator shape.
- Cone : Use a cone as the weight generator shape.
- Pyramid : Use a pyramid as the weight generator shape.
- Torus : Use a torus as the weight generator shape.
Sphere Radius
Set the outer radius of the sphere.
Cylinder Radius
Set the outer radius of the cylinder.
Cylinder Height
Set the height of the cylinder.
Cone Base Radius
Set the radius of the base of the cone.
Box Size X
Set the size of the box along the X axis.
Box Size Y
Set the size of the box along the Y axis.
Box Size Z
Set the size of the box along the Z axis.
Box Bevel Radius
Set the radius of the bevel on the edges of the box.
Pyramid Size X
Set the size of the pyramid along the X axis.
Pyramid Size Z
Set the size of the pyramid along the Z axis.
Torus Inner Radius
Set the inner radius of the torus.
Torus Outer Radius
Set the outer radius of the torus.
Fill Mode
How should the shape calculate the weight.
- Filled : The shape is filled, so everything within the shape will be added to the weight.
- Shell : Only the shell of the shape will be added to the weight. Everything within the shape will not.
Invert Value
Invert the value of the weight.
These properties control the falloff of the primitive weight.
Parameter Details Falloff Mode
Method of applying the falloff.
- Off : Do not use falloff, only add the base primitive to the weight.
- Spherical : Extrude a spherical falloff from each point of the base primitive, adding a falloff outward of the primitive.
Falloff Axis
Which axis the falloff should be oriented on.
- X :
- Y :
- Z :
Falloff Direction
When using Planar mode, which directions to use to calculate the falloff.
Falloff Easing Mode
Interpolation method used to calculate the falloff within its range of influence.
- Linear :
- Sine :
- Quadratic :
- Cubic :
- Circular :
- Bounce Back :
- Elastic :
Falloff Size X
Size of the falloff range along the X axis.
Falloff Size Y
Size of the falloff range along the Y axis.
Falloff Size Z
Size of the falloff range along the Z axis.
Outer Range
Outer range of the falloff, outside of which the falloff is no longer effective.
Inner Range
Inner range of the falloff, inside of which the falloff is fully effective.
Invert
Inverts the effect of the falloff.
Curve Power
Controls the rate of change for the falloff between the inner and outer range.
Curve
A preview of the falloff easing curve, alongside controls for editing it. Click the curve to add control points, and drag them to shape how the effect strength blends between the Inner Range (100%) and Outer Range (0%). The curve remaps the falloff gradient produced by the Size, Range and Curve Power settings.
The properties control the time at which the node is active. See Timeline for editing time segments.
Parameter Details Duration
Control the duration of the node’s time segment.
- Composition Duration : Use the length of the composition for the node’s time segment duration.
- Custom : Set a custom duration for the node’s time segment.
Node Time
The custom start and end time for the node.
Duration (Timecode)
The length of the node’s time segment (in time).
Duration (Frames)
The length of the node’s time segment (in frames).
Time Segment Enabled
Set whether the node’s time segment is enabled or not in the Timeline.
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 |
|---|---|
| Primitive Type |
Choose which 3D shape to generate the weight with.
|
| Sphere Radius | Set the outer radius of the sphere. |
| Cylinder Radius | Set the outer radius of the cylinder. |
| Cylinder Height | Set the height of the cylinder. |
| Cone Base Radius | Set the radius of the base of the cone. |
| Box Size X | Set the size of the box along the X axis. |
| Box Size Y | Set the size of the box along the Y axis. |
| Box Size Z | Set the size of the box along the Z axis. |
| Box Bevel Radius | Set the radius of the bevel on the edges of the box. |
| Pyramid Size X | Set the size of the pyramid along the X axis. |
| Pyramid Size Z | Set the size of the pyramid along the Z axis. |
| Torus Inner Radius | Set the inner radius of the torus. |
| Torus Outer Radius | Set the outer radius of the torus. |
| Fill Mode |
How should the shape calculate the weight.
|
| Invert Value | Invert the value of the weight. |
These properties control the falloff of the primitive weight.
| Parameter | Details |
|---|---|
| Falloff Mode |
Method of applying the falloff.
|
| Falloff Axis |
Which axis the falloff should be oriented on.
|
| Falloff Direction | When using Planar mode, which directions to use to calculate the falloff. |
| Falloff Easing Mode |
Interpolation method used to calculate the falloff within its range of influence.
|
| Falloff Size X | Size of the falloff range along the X axis. |
| Falloff Size Y | Size of the falloff range along the Y axis. |
| Falloff Size Z | Size of the falloff range along the Z axis. |
| Outer Range | Outer range of the falloff, outside of which the falloff is no longer effective. |
| Inner Range | Inner range of the falloff, inside of which the falloff is fully effective. |
| Invert | Inverts the effect of the falloff. |
| Curve Power | Controls the rate of change for the falloff between the inner and outer range. |
| Curve | A preview of the falloff easing curve, alongside controls for editing it. Click the curve to add control points, and drag them to shape how the effect strength blends between the Inner Range (100%) and Outer Range (0%). The curve remaps the falloff gradient produced by the Size, Range and Curve Power settings. |
The properties control the time at which the node is active. See Timeline for editing time segments.
| Parameter | Details |
|---|---|
| Duration |
Control the duration of the node’s time segment.
|
| Node Time | The custom start and end time for the node. |
| Duration (Timecode) | The length of the node’s time segment (in time). |
| Duration (Frames) | The length of the node’s time segment (in frames). |
| Time Segment Enabled | Set whether the node’s time segment is enabled or not in the Timeline. |
| Name | Description | Typical Input |
|---|---|---|
| Transform Array | A transform array positioning each clone. | Transform Array |
| Affected Emitters | Choose which particle emitters can be affected by the affector. | Primitive Emitter |
| 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 |
| Parameter Value Array | Used to set the parameters of the node using an array. | Parameter Array |
| Falloff Node | Use an input node to control the properties of the falloff. | Falloff |