Curve Falloff

Summary

The Curve Falloff generates a Falloff Attribute based on distance calculations from curve geometry. It provides precise control over falloff distribution using curve-based distance fields with adjustable min/max distance ranges.

It supports multiple falloff modes including distance to curve, distance multiplied by curve position, and pure curve position, enabling diverse creative workflows for particle distribution and procedural effects.

The operator includes curve resampling options for optimizing performance and visualization, along with complete spatial transformation controls.

Parameters

Page: Curve

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.
Curve Geometry (POP) Curvegeometry – Reference POP operator containing the curve geometry used for distance calculations.
Display Curve Displaycurve – When enabled, renders a visual representation of the curve in the viewport for reference.
Color Color – – Color used to display the curve when Display Curve is enabled.
Color Colorr
Color Colorg
Color Colorb
Color Colora
Mode Mode – – Calculation method for generating falloff values from the curve.
Distance to Curve distancetocurve
Distance Times Curve Position distancetimescurveposition
Curve Position curveposition
Min Distance Mindistance – Minimum distance value for falloff calculation range.
Max Distance Maxdistance – Maximum distance value for falloff calculation range.
Resample Method Resamplemethod – – Method used for resampling the curve geometry.
Equal Segments equalsegments
Length length
Divisions Divisions – Number of divisions for Equal Segments resampling method.
Max Segment Length Maxsegmentlength – Maximum segment length for Length resampling method.
Max Verts Maxverts – Maximum number of vertices allowed after resampling.
Max Tries Maxtries – Maximum iteration attempts for resampling convergence.
Transform Order Xord – – Order in which Scale, Rotate, and Translate operations are applied to the curve.
Scale Rotate Translate srt
Scale Translate Rotate str
Rotate Scale Translate rst
Rotate Translate Scale rts
Translate Scale Rotate tsr
Translate Rotate Scale trs
Rotate Order Rord – – Order in which rotations around the X, Y, and Z axes are applied.
Rx Ry Rz xyz
Rx Rz Ry xzy
Ry Rx Rz yxz
Ry Rz Rx yzx
Rz Rx Ry zxy
Rz Ry Rx zyx
Translate T – – Translation offset applied to the curve in world space.
Translate Tx
Translate Ty
Translate Tz
Rotate R – – Rotation angles in degrees around the X, Y, and Z axes.
Rotate Rx
Rotate Ry
Rotate Rz
Scale S – – Scale factors applied to the curve along each axis.
Scale Sx
Scale Sy
Scale Sz
Uniform Scale Uniformscale – Uniform scaling factor applied equally across all axes.
Pivot P – – Pivot point around which rotations and scaling are performed.
Pivot Px
Pivot Py
Pivot Pz

Page: Falloff

Combine Operation Combineop – – Mathematical operation used to combine this falloff with existing falloff values.
Add add
Substract sub
Multiply mult
Divide div
Screen screen
Overlay overlay
Maximum max
Minimum min
Set set
Combine Falloff Attribute Combineattributescope – Specifies which falloff attribute to combine with when Combine Operation is not set to Set.
Swap Operation Order Swaporder – Reverses the order of operands in the combine operation (A op B becomes B op A).
Combine Strength Combinestrength – Blending factor for the combine operation, ranging from 0 (no effect) to 1 (full effect).
Output Falloff Attribute Outputfalloffattribute – Name of the attribute where the final falloff values will be stored.
Preview Falloff Previewfalloff – When enabled, visualizes falloff values using a color ramp.
Falloff Ramp Fallofframp – – Color ramp preset used for visualizing falloff values when Preview Falloff is enabled.
Heatmap heatmap
Blackbody blackbody
Infrared infrared
Custom custom
Open Custom Ramp Opencustumramp – Opens the custom color ramp editor for defining a custom falloff visualization gradient.
Reset Custom Ramp Resetcustomramp – Resets the custom color ramp to its default state.

Page: Noise

Apply Noise Applynoise – When enabled, adds procedural noise to the falloff values for organic variation.
Combine Operation Combineopnoise – – How noise values are combined with the base falloff (Add or Multiply).
Add add
Multiply mult
Type Type – – Noise algorithm type (Perlin, Simplex, etc.).
Perlin 2D (GPU) perlin2d
Perlin 3D (GPU) perlin3d
Perlin 4D (GPU) perlin4d
Simplex 2D (GPU) simplex2d
Simplex 3D (GPU) simplex3d
Simplex 4D (GPU) simplex4d
Seed Seed – Numerical value that initializes the randomization.
Period Period – Period (scale) of the noise field.
Harmonics Harmon – The number of higher frequency components to layer on top of the base frequency. 0 harmonics give the base shape.
Harmonic Spread Spread – The factor by which the frequency of a harmonic increases relative to the previous harmonic.
Harmonic Gain Gain – Amplitude of the Harmonics layered on top of the base frequency.
Amplitude Amp – The noise values amplitude (a scale on the values output).
Exponent Exp – Sets the exponent. The internal value is raised by the power of the exponent.
Offset Offset – Adds an offset to the resulting value.
Transform Order Xordnoise – – Sets the overall transform order for the transformations.
Scale Rotate Translate srt
Scale Translate Rotate str
Rotate Scale Translate rst
Rotate Translate Scale rts
Translate Scale Rotate tsr
Translate Rotate Scale trs
Rotate Order Rordnoise – – Sets the order of the rotations within the overall transform order.
Rx Ry Rz xyz
Rx Rz Ry xzy
Ry Rx Rz yxz
Ry Rz Rx yzx
Rz Rx Ry zxy
Rz Ry Rx zyx
Translate Tnoise – – Translate the points through the noise space.
Translate Tnoisex
Translate Tnoisey
Translate Tnoisez
Rotate Rnoise – – Rotate the points around the corresponding X, Y and Z axes. Angles are given in degrees.
Rotate Rnoisex
Rotate Rnoisey
Rotate Rnoisez
Scale Snoise – – These three fields scale the Source geometry in the three axes.
Scale Snoisex
Scale Snoisey
Scale Snoisez
Pivot Pnoise – – The pivot point for the transform rotates and scales.
Pivot Pnoisex
Pivot Pnoisey
Pivot Pnoisez
Translate 4D T4dnoise – Translates the points through the 4th noise dimension.

Page: Remap

Clamp Clamp – When enabled, constrains falloff values to the 0-1 range.
Fit Fit – Enables remapping of falloff values from an input range to an output range.
Auto Input Min Max Auto – Automatically determines input range from actual min/max falloff values.
Input Min Inputmin – Minimum value of the input range for remapping.
Input Max Inputmax – Maximum value of the input range for remapping.
Output Min Outputmin – Minimum value of the output range for remapping.
Output Max Outputmax – Maximum value of the output range for remapping.
Invert Invert – Reverses the falloff values (1 - value).
Enable Remap Ramp Enableremapramp – Applies a custom curve to remap falloff values non-linearly.
Open Remap Ramp Remapramp – Opens the ramp editor for defining the custom remapping curve.
Reset Remap Ramp Resetremapramp – Resets the remapping curve to a linear ramp.
Ramp TOP Ramptop – External TOP containing a custom remap curve texture.

Page: Common

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.
SRT / RST Srtrst – Sets the transform order when using POPX Geometry as built-in TouchDesigner instances.

Inputs

Input 0 – POP – POPX Geometry or regular geometry to apply falloff to
Input 1 – Curve POP – Curve geometry for distance-based falloff calculations

Outputs

Output 0 – POP – Geometry with falloff attribute applied