> modifiers

Spring Modifier

modifiers/spring-modifier·v1.3.0

IN:1 OUT:1

SUMMARY

The Spring Modifier applies spring physics to each instance, creating bouncy, elastic motion effects. It can affect position, rotation, scale, or custom float attributes, simulating realistic spring behavior with configurable mass, spring constant, and damping.

You can enable spring physics independently for Position, Rotation, and Scale, or apply it to a custom float attribute by enabling Other. The spring behavior is controlled by the Mass, Spring Constant, and Damping Coefficient parameters.

The effect can be attenuated using a Falloff Attribute, and you can override the global mass parameter with a per-instance Mass Attribute for more granular control. This enables spatially varying spring effects where different instances respond differently to the same spring forces.

PARAMETERS

PAGESpring

Group	Group	If there are input groups, specifying a group name in this field will cause this POPX to act only upon the group specified.
Target Points Update POP	Pointsupdatepop	Reference to a POP node downstream in the network when Solver Mode is set to Advect. This reference will cause a feedback loop and re-injects the points next frame.
Do Falloff	Dofalloff	Enables falloff-based attenuation of spring effects.
Falloff Attribute	Falloffattr	Specifies which attribute to use for falloff values that attenuate spring intensity.
Position	Position	Applies spring physics to instance position.
Rotation	Rotation	Applies spring physics to instance rotation.
Scale	Scale	Applies spring physics to instance scale.
Other	Other	Enables spring physics for a custom float attribute.
Attribute (Float)	Attr	Specifies which float attribute to apply spring physics to when Other is enabled.
Use Mass Attribute	Usemassattr	Uses a per-instance mass attribute instead of the global Mass parameter.
Mass Attribute	Massattr	Specifies which attribute to use for per-instance mass values.
Mass	Mass	Mass value used in spring physics calculations. Higher mass results in slower response to spring forces.
Spring Constant	Springconst	Stiffness of the spring. Higher values create tighter, faster-responding springs.
Damping Coefficient	Dampingcoef	Controls how quickly spring motion decays. Values closer to 1 result in less oscillation.
Initialize	Initializepulse	Resets the spring simulation state to initial conditions.
Start	Startpulse	Begins the spring simulation from the current state.
Play	Play	Toggles spring simulation playback on or off.

PAGEFalloff

Preview Falloff	Previewfalloff	Visualizes the Other float attribute as colors when Other is enabled.
[+]Falloff Ramp	Fallofframp	Selects the color ramp used for visualizing the Other float attribute when Preview Falloff is enabled.
Open Custom Ramp Editor	Opencustumrampeditor	Opens the custom ramp editor for creating custom visualization gradients for the Other float attribute.
Reset Custom Ramp	Resetcustomramp	Resets the custom ramp to default gradient values.

PAGECommon

Bypass	Bypass	Pass through the first input to the output unchanged.
Free Extra GPU Memory	Freeextragpumem	Free memory that has accumulated when output memory has grown and shrunk.
Render Primitives	Renderprimitives	Toggles rendering of POPX Geometry or shows it as point instances only.
Convert to Point Primitives	Converttoptprim	Converts points to primitive points when Render Primitives is toggled off.
SRT / RST	Srtrst	Sets the transform order when using POPX Geometry as built-in TouchDesigner instances.

INPUTS

Input 0 POP – POPX/POP Geometry

OUTPUTS

Output 0 POP – POPX_out1