Method

This node applies a force to the affected particles. This is typically used to give particles a constant acceleration to simulate e.g. gravity.

The Mode attribute is used to determine if the force is directional with a random spread determined by the Spread Angle attribute, or if it is an attracting or repelling force generated from the effector’s position. The magnitude of the force is controlled by the Amount attribute and modulated by a random value which is constant per particle and weighted by the Randomness attribute.

The resultant force is weighted by a falloff calculated using the distance from the node to the particle. The effect ramps 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
Amount How strong an effect the force has on the particles.
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.
Mode Change which kind of force is applied.
  • Directional Force, The force is applied in a particular direction, along the z axis.
  • Repel, the particles move away from the node.
  • Attract, the particles move towards the node.

Inputs

Name Description Typical Node Input
Transform Nodes Override the objects transform attributes with an input objects transform attributes. Null
Force Transformer Transforms the force 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.