Method

This node applies turbulence to the particle motion. This is typically used to apply local variations to particle movement and simulate small gusts of wind. The motion is generated by using a smoothed noise field for both the direction and the magnitude of the applied velocity. The noise field is scaled by the Noise Scale attribute and thresholded by the Noise Threshold attribute, so that areas of the noise field that are below the threshold contribute no motion. The overall amount of motion applied is scaled by the Velocity Scale attribute.

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

Example
Example Nodegraph

Transform

Name Description
Position X Move its position along the x-axis in local space.
Position Y Move its position along the y-axis in local space.
Position Z Move its position along the z-axis in local space.
Rotation Heading Rotate the object about the x-axis.
Rotation Pitch Rotate the object about the y-axis.
Rotation Bank Rotate the object about the z-axis.
Scale X Scale along the x-axis.
Scale Y Scale along the y-axis.
Scale Z Scale along the z-axis.

Inherit Transform Channels

Toggle which transform channels should be inherited. By default, all are on.

Attributes

Name Description
Velocity Scale Scale the strength of the affectors velocity on the particles.
Spread Angle Change the angle of spread for the particles.
Radius Alter the outer radius at which the affector is no longer effective.
Inner Radius Alter the inner radius up to which the affector is fully effective.
Randomness How much randomness is added in the particles movement.
Noise Scale The scale of the noise field.
Noise Threshold The threshold applied to the noise field.
Mode Change which kind of turbulence is applied.
  • Directional Force, The force is applied in a direction defined by the rotation of the node.
  • Repel, The particles move away from the node.
  • Attract The particles move towards the node.
  • Turbulence, The particles are given turbulent motion.
Falloff Shape The affect becomes weaker the further away from a chosen shape.
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 Node Input
Velocity Node Overrides the velocity direction. Null
Affected Emitters Choose which emitters can be affected by the affector. Primitive Emitter
Procedural Falloff Use the SDF values from a procedural system to dictate the falloff. Procedural Root
Transform Modifier Links all transform properties to the input node. Null
Target Node Always faces the x-axis towards the inputs anchor point. Null
Local Transform Override Override the transformation values of the node, relative to its parent. Null

Outputs

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