Velocity Affector
Updated: 4 Dec 2023
Applies a directional velocity to a field.
Velocity Affector
Method #
This node applies a directional velocity to the movement vectors of the field, pushing everything in the field along one direction.
The outputs from this node are just its transforms, useful for having multiple nodes follow the same motions without controlling each of their transforms individually.
Parameters
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 The objects position along the local x-axis.
Position Y The objects position along the local y-axis.
Position Z The objects position along the local z-axis.
Rotation Heading The objects rotation around the local y-axis.
Rotation Pitch The objects rotation around the local x-axis.
Rotation Bank The objects rotation around the local z-axis.
Scale X The objects scale along the local x-axis.
Scale Y The objects scale along the local y-axis.
Scale Z The objects scale along the local z-axis.
Control the inheritance of the transforms from the parent.
Parameter Details Position Toggle inheritance of the Position from the parent.
Rotation Toggle inheritance of the Rotation from the parent.
Scale Toggle inheritance of the 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.
These properties control the core behaviours of the node.
Parameter Details Affector Mode The method by which the affector is applied to the field.
- Force : The results of the affector are added to the simulation as forces.
- Velocity Modifier : The results of the affector are added each frame after the results of the simulation, and not injected into the simulation itself.
Mode Change how the velocity affects the field.
- Directional Velocity : Pushes the field along the local z axis.
- Repel : Pushes the fields away from the affector origin point.
- Attract : Pulls the field towards the affectors origin point.
Velocity Amount Scale the generated affector velocities.
Spread Angle Controls how much the spread there is from the field velocities generated.
Randomness The randomness of the new velocities added to the simulation.
Channels Which axes to apply velocity to
Modulate By Velocity The strength of the affector is modulated per cell by the magnitude of the velocity of the cell, so movement is stronger in faster-moving areas.
Modulate By Temperature The strength of the affector is modulated per cell by the temperature of the cell, so movement is stronger in hotter areas.
Inputs
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 | The objects position along the local x-axis. |
| Position Y | The objects position along the local y-axis. |
| Position Z | The objects position along the local z-axis. |
| Rotation Heading | The objects rotation around the local y-axis. |
| Rotation Pitch | The objects rotation around the local x-axis. |
| Rotation Bank | The objects rotation around the local z-axis. |
| Scale X | The objects scale along the local x-axis. |
| Scale Y | The objects scale along the local y-axis. |
| Scale Z | The objects scale along the local z-axis. |
Control the inheritance of the transforms from the parent.
| Parameter | Details |
|---|---|
| Position | Toggle inheritance of the Position from the parent. |
| Rotation | Toggle inheritance of the Rotation from the parent. |
| Scale | Toggle inheritance of the 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. |
These properties control the core behaviours of the node.
| Parameter | Details |
|---|---|
| Affector Mode | The method by which the affector is applied to the field.
|
| Mode | Change how the velocity affects the field.
|
| Velocity Amount | Scale the generated affector velocities. |
| Spread Angle | Controls how much the spread there is from the field velocities generated. |
| Randomness | The randomness of the new velocities added to the simulation. |
| Channels | Which axes to apply velocity to |
| Modulate By Velocity | The strength of the affector is modulated per cell by the magnitude of the velocity of the cell, so movement is stronger in faster-moving areas. |
| Modulate By Temperature | The strength of the affector is modulated per cell by the temperature of the cell, so movement is stronger in hotter areas. |
| Name | Description | Typical Input |
|---|---|---|
| Velocity Node | A transform node that overrides the velocity direction and source position. | Null |
| Affected Emitters | Choose which particle emitters can be affected by the affector. | Primitive Emitter |
| 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 |