Attribute Weight

Updated: 23 Sep 2025

Generates weight values using attributes of the particle, such as its velocity.

Method #

This node generates a per-particle weight values using attributes from the parent particle system. These can then be used to vary the strength of affectors on the parent particle system.

The output from this node are particle weights which are unique to the parent particle system, so can’t be used to influence other particle systems.

Parameters

Transform

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.

Parent Transform

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.

Attributes

These properties control the core behaviours of the node.

Parameter	Details
Input Channel	Choose which attribute to use to generate the weight. Velocity X : Generates weight based on the particles velocity along the X axis. Velocity Y : Generates the weight based on the particles velocity along the Y axis. Velocity Z : Generates the weight based on the particles velocity along the Z axis. Velocity Magnitude : Generates the weight based on the particles absolute velocity. Velocity Along Direction : Generates the weight based on how much the particles velocity points along the orientation of the weight node. Facing Along Direction : Generates the weight based on how much its facing direction is aligned to the orientation of the weight node. Life : Generates the weight based on the remaining life of the particle. Time : Generates the weight based on the time since birth of the particle. Normalised Life : Generates the weight based on the remaining life of the particle, scaled into 0 to 1 range by the life at birth of the particle. Distance From Emission Position : Generates the weight based on the particles distance from where they were spawned.
Use Absolute Value (Ignore Sign)	If value is negative, make it positive.
Attribute Scale	Scale the value of the selected attribute.
Attribute Bias	Offset the value of the selected attribute.
Invert Value	Invert the value of the selected attribute.
Radius	TBC

Inputs

Name	Description	Typical Input
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