Curl Noise Fluid Affector

Applies curl noise velocities to Particles.

Method #

This node gives the affected particles a fluid-like motion. This is typically used to make particles move in a turbulent but spatially coherent manner with local eddies like smoke or liquid. The motion is generated procedurally using Curl Noise rather than simulated so it doesn’t incur the performance overhead of a fluid solver.

The effect is weighted by a falloff calculated using the distance from the node to the particle, ramping from 100% at distance zero down to 0% at the distance specified by the Radius attribute.

All nodes connected to this node are treated as if flowing to the parent node, and inherits any transformation changes along the chain.

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	Move along the local x-axis.
Position Y	Move along the local y-axis.
Position Z	Move along the local z-axis.
Rotation Heading	Rotate around the local y-axis.
Rotation Pitch	Rotate around the local x-axis.
Rotation Bank	Rotate around the local z-axis.
Scale X	Scale along the local x-axis.
Scale Y	Scale along the local y-axis.
Scale Z	Scale along the local z-axis.

Inherit Transform Channels

Toggle which transform channels should be inherited from the parent node. By default, all transforms will be inherited.

Parameter	Details
Position X	Toggle inheritance of the X Position from the parent.
Position Y	Toggle inheritance of the Y Position from the parent.
Position Z	Toggle inheritance of the Z Position from the parent.
Rotation Heading	Toggle inheritance of the Rotation Heading from the parent.
Rotation Pitch	Toggle inheritance of the Rotation Pitch from the parent.
Rotation Bank	Toggle inheritance of the Rotation Bank from the parent.
Scale X	Toggle inheritance of the X Scale from the parent.
Scale Y	Toggle inheritance of the Y Scale from the parent.
Scale Z	Toggle inheritance of the Z 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
Fluid Simulation Speed	Speed at which the fluid simulation updates.
Curl Noise Amount	Controls the magnitude of the motion applied to the particles.
Noise Size	Controls the size of the noise curls.
Normalise Noise Parameters	Automatically balance the curl noise amount when the noise size changes.
Radius	Alter the outer radius at which the affector is no longer effective.
Randomness	How much randomness is added in the particles movement.
Life Effect Coeffs	How much the particles are affected by the affector at different stages of the particles life cycle. Values 1 and 2 are control points used to control a bezier curve between values 0 and 3.

Inputs

Name	Description	Typical Input
Velocity Transform	Can be used to apply an additional transform to the velocities generated by the node.	Null
Mask Node	Mask out areas that particles cannot spawn.	Image Plane
Affected Emitters	Choose which particle emitters can be affected by the affector.	Primitive Emitter
Procedural Falloff	Use the distance field from a procedural system to vary how strong the affector is.	Procedural Root
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