Normalize an anatomical surface underlay — normalize_surface

Converts curvature or sulcal depth to a centered display metric in [-0.5, 0.5], suitable for the surfview curvature layer. This changes only anatomical shading, never statistical values or surface coordinates.

Usage

normalize_surface_anatomy(
  metric,
  style = c("continuous", "binary"),
  midpoint = NULL,
  invert = FALSE
)

Arguments

metric: Finite numeric anatomy values, one per vertex.
style: Continuous robust scaling or binary folding contrast.
midpoint: Boundary between dark and light. NULL uses the median, including for the historical [0, 1] output of [curvature()]. Use zero for a native signed metric whose anatomical boundary is zero.
invert: Reverse dark/light polarity. Select this from the source metric's sign convention; signs differ between curvature producers.

Value

A numeric vector in [-0.5, 0.5]. Constant metrics remain neutral.