> falloffs

Channel Falloff

falloffs/channel-falloff·v1.4.0

IN:2 OUT:1

SUMMARY

Channel Falloff maps CHOP channel data onto points by using a per-point attribute as an index into the CHOP samples. The attribute value - such as normalized point index, life, or a custom attribute - selects a position along the CHOP, and the channel value at that position becomes the falloff weight.

Lookup Index Attribute sets which attribute drives the lookup. Index Units switches between normalized (0-1) and sample index modes. Cyclic wraps the index, Interpolate blends between adjacent samples, and Extend Left/Right defines out-of-range behavior. Channel Scope targets specific CHOP channels as the falloff source.

PARAMETERS

PAGEChannel

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.
CHOP	Chop	CHOP to use as the falloff data source. Each sample in the CHOP represents a falloff value that points can look up by index.
[+]Lookup Index Attribute(s)	Lookupindexattr	Per-point attribute used as the index into the CHOP. The attribute value determines which sample each point reads from. Common choices are _PointU (normalized position across all points) or _PointI (raw point index).
[+]Lookup Index Units	Indexunit	Units for the lookup index attribute. Normalized (0-1) maps the full attribute range across the entire CHOP length. Sample Index uses the attribute value as a direct CHOP sample position.
Cyclic Index	Cyclic	When enabled, the index wraps so the last sample connects back to the first, letting the full range map evenly across the cycle without a discontinuity at the boundary.
Interpolate	Interpolate	When on, values between CHOP samples are smoothly interpolated. When off, the nearest sample is used, producing stepped falloff.
[+]Extend Left and Right	Extend	Behavior when the lookup index falls outside the valid CHOP sample range. Hold clamps to the edge value, Slope extrapolates linearly, Cycle repeats the pattern, Mirror reflects it.
Channel Scope	Chanscope	Specifies which CHOP channels to read as falloff values. Use * for all channels, or enter specific channel names to target individual channels.

PAGEFalloff

[+]Combine Operation	Combineop	Mathematical operation used to combine this falloff with existing falloff values.
[+]Combine Falloff Attribute	Combattrscope	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	Combstrength	Blending factor for the combine operation, ranging from 0 (no effect) to 1 (full effect).
[+]Output Falloff Attribute	Outputfalloffattr	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.
Open Custom Ramp Editor	Opencustomrampeditor	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.

PAGENoise

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).
[+]Type	Type	Noise algorithm type (Perlin, Simplex, etc.).
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.
[+]Rotate Order	Rordnoise	Sets the order of the rotations within the overall transform order.
[+]Translate	Tnoise	Translate the points through the noise space.
[+]Rotate	Rnoise	Rotate the points around the corresponding X, Y and Z axes. Angles are given in degrees.
[+]Scale	Snoise	These three fields scale the Source geometry in the three axes.
[+]Pivot	Pnoise	The pivot point for the transform rotates and scales.
Translate 4D	T4dnoise	Translates the points through the 4th noise dimension.

PAGERemap

Enable Remap	Remap	Enables remapping controls for adjusting falloff value range and distribution.
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 Ramp Remap	Enablerampremap	Applies a custom curve defined by a ramp to remap the falloff values.
Open Ramp Editor	Openrampeditor	Opens the ramp editor for defining the custom remapping curve.
Reset Ramp	Resetramp	Resets the remap ramp editor.
Custom Ramp TOP	Customramptop	Reference to an external TOP for remap control. When specified, overrides the internal ramp editor.

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

Input 1 CHOP – Channel

OUTPUTS

Output 0 POP – POPX_out1