Apply Attributes

Summary

Apply Attributes is the core transformation engine of POPX, taking packed primitives and applying template point attributes to drive transformations. This operator is the fundamental building block for most POPX operations, handling the application of position, rotation, scale, and pivot data from template points to geometry instances.

The operator uses the popxFalloff point attribute (or custom falloff attribute) to blend transformations smoothly. Orientations are blended using slerp (spherical linear interpolation) for natural rotation interpolation, while translations and scales are linearly interpolated. This ensures smooth, predictable motion even with complex falloff patterns.

Apply Attributes supports both absolute and relative transformations through its Local Space option, and offers flexible rotation and scale modes. The operator can also copy arbitrary point attributes from template geometry to instances, and automatically manages orient and scale attributes for downstream operators. The Create popxId Attribute option ensures each instance has a unique identifier for tracking and reference.

Parameters

Page: Transformation

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.
Do Falloff Dofalloff – When enabled, uses a falloff attribute to blend transformations smoothly.
Falloff Attribute Falloffattr – Name of the falloff attribute to use for blending transformations (default: popxFalloff).
Do Translate Dotranslate – Enables translation transformations from template points.
Do Rotate Dorotate – Enables rotation transformations from template points using slerp interpolation.
Do Scale Doscale – Enables scale transformations from template points.
Do Pivot Dopivot – Enables pivot point transformations from template points.
Local Space Localspace – When enabled, applies transformations relative to the instance's current transform.
Rotate Mode Rotmode – – Determines how rotations are applied to instances.
Add add
Set set
Rotate Order Rord – – Order in which rotation axes are applied.
XYZ xyz
XZY xzy
YXZ yxz
YZX yzx
ZXY zxy
ZYX zyx
Scale Mode Scalemode – – Determines how scale values are applied to instances.
Multiply mult
Replace replace

Page: Attributes

Copy Attributes Copyattrs – When enabled, copies point attributes from template geometry to instances.
Attributes To Copy Attrstocopy – Space-separated list of attribute names to copy from template points.
Create popxId Attribute if Missing Createid – Automatically creates unique popxId attributes for instances that don't have one.
Output Orient Attribute Outputorientattr – Outputs orientation data as an attribute for downstream operators.
Output Scale Attribute Outputscaleattr – Outputs scale data as an attribute for downstream operators.

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/POP Geometry
Input 1 POP – Template Points

Outputs

Output 0 POP – POPX_out1