Notch Notch Manual 0.9.23
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Procedural Affector

Procedural Affector

Allows particles to interact with procedurals.



Method #

This node simulates collisions between particles and Procedural meshing object. Different effects can be achieved, such as attraction and repulsion from object surfaces or making particles flow around the particle surface, as selected by the Mode parameter.

At least one Procedural Object Node must be connected via the Procedural Nodes input for this node to be effective.


These properties control the core behaviours of the node.

ModeChoose how the node interacts with the input object.
  • Attractor : Moves the particles towards the mesh.
  • Repel : Moves the particles away from the mesh.
  • Collision : Particles collide with the object and bounce off.
  • Follow Contours : Particles flow around the surface of the object.
RadiusLimit the radius at which particles can be affected by the affector.
Velocity ScaleScale the strength of the affectors velocity on the particles.
Life Effect CoeffsHow 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.
Colour WeightControls how much the colour value generated by the affector is blended with the particle’s current colour.
Collision Velocity ScaleScales the velocity of the particle after a collision so they can be made to slow down.
Is Inside ThresholdDistance inside or outside the object at which collisions are considered to have occured.
Surface Distance TargetThe radius of the particle when determining collisions.
On Surface Velocity ScaleScales the velocity of the particle when it is on the surface of the object.
Collision Event LikelinessControls for what fraction of collisions a collision event should be triggered.
Use ColoursToggle whether to use the colours input by the mesh.
Invert SpaceInvert the object so areas inside the mesh are considered hollow and areas outside are filled.


NameDescriptionTypical Input
Procedural NodeThe source Procedural mesh for the particles to be affected by.Procedural Meshing
Affected EmittersChoose which particle emitters can be affected by the affector.Primitive Emitter
Procedural FalloffUse the distance field from a procedural system to vary how strong the affector is.Procedural Root
Transform ModifiersApply the transforms of another node to this node.Null
Target NodeModifiy the rotations of the node to always direct the z axis towards the input.Null
Local Transform OverrideApply the transforms of another node to this node, relative to its parent.Null