Evaluate Curve

Samples a Path at normalised parameter t ∈ [0, 1] by arc length. Returns the point, the local tangent, and the curve's total arc length.

Node

Interactive preview is available in the interactive reader.

Sockets

path (in): Path. Required.
t (in): Float. Normalised position along the curve (default 0.5).
point (out): Vector3 — position on the curve at t.
tangent (out): Vector3 — unit tangent direction at t.
length (out): Float — total arc length of the input path.

Parameters

t: Fallback parameter when the t socket is unconnected. Default: 0.5.

How It Works

Walks the path's cumulative arc length until it lands on the segment containing t * totalLength, then linearly interpolates between that segment's endpoints for the point and uses the segment direction as the tangent. t outside [0, 1] clamps to the endpoints.