Curve Info

The Curve Info node provides per-curve attributes describing the identity, geometry, and relationships of each curve in a hair or curve system. It is often used in procedural grooming and deformation setups to drive randomization, orientation, or effects that depend on each curve’s properties.

Inputs

This node has no inputs.

Outputs

Curve Index

The index of each curve within the geometry component. This can be used for deterministic indexing or pattern generation.

Curve ID

A stable unique ID for each curve. Unlike Curve Index, this value remains consistent even if curves are added or removed.

Length

The total length of each curve, measured along its evaluated spline. Useful for scaling effects or adjusting deformation strength based on hair length.

Direction

A normalized vector pointing from the root toward the tip of each curve. This represents the overall direction of the curve and can be used for orienting instances or driving direction-dependent effects.

Random

A random vector assigned per curve, based on the Curve ID. It provides consistent randomization between evaluations, allowing for reproducible but varied results across curves.

Surface UV

The UV coordinates on the surface mesh where each curve is attached. This is typically used for sampling textures, transferring color data, or controlling procedural effects based on surface location.