Notch Notch Manual 0.9.23
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Velocity Affector

Velocity Affector

Applies a constant velocity to particles.



Method #

This node applies a constant velocity to the affected particles. This is typically used to make particles move in a regular, linear fashion, e.g. wind effects or repulsions.

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


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.

Position XMove along the local x-axis.
Position YMove along the local y-axis.
Position ZMove along the local z-axis.
Rotation HeadingRotate around the local y-axis.
Rotation PitchRotate around the local x-axis.
Rotation BankRotate around the local z-axis.
Scale XScale along the local x-axis.
Scale YScale along the local y-axis.
Scale ZScale along the local z-axis.

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

Position XToggle inheritance of the X Position from the parent.
Position YToggle inheritance of the Y Position from the parent.
Position ZToggle inheritance of the Z Position from the parent.
Rotation HeadingToggle inheritance of the Rotation Heading from the parent.
Rotation PitchToggle inheritance of the Rotation Pitch from the parent.
Rotation BankToggle inheritance of the Rotation Bank from the parent.
Scale XToggle inheritance of the X Scale from the parent.
Scale YToggle inheritance of the Y Scale from the parent.
Scale ZToggle inheritance of the Z Scale from the parent.
World Position OnlyInherit the world position from the parent only, rotation and scale will be ignored. Overrides above properties.
Inherit TimeToggle inheritance of time from the parent.

These properties control the core behaviours of the node.

Velocity AmountScale the strength of the affectors velocity on the particles.
Spread AngleChange the angle of spread for the particles.
RadiusAlter the outer radius at which the affector is no longer effective.
Inner RadiusAlter the inner radius up to which the affector is fully effective.
RandomnessHow much randomness is added in the particles movement.
ModeChoose what kind of velocity affects the particles.
Falloff ShapeThe primitive shape used to calculate the falloff weight for the affector.
  • Point : Uses the distance from the centre position of the node
  • Line : Uses the distance from an infinite line in the x axis centred at the position of the node
  • Plane : Uses the distance from an infinite plane in the xy axis centred at the position of the node.
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.


NameDescriptionTypical Input
Velocity NodeA transform node that overrides the velocity direction and source position.Null
Mask NodeMask out areas that particles cannot spawn.Image Plane
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