Build Surface Polygon Data for Rendering — build_surface_polygon

Build 2D projected polygon/boundary data from a surfatlas for custom rendering workflows. This exposes the mesh-projection data pipeline used internally by plot_brain().

Usage

build_surface_polygon_data(
  surfatlas,
  views = c("lateral", "medial"),
  surface = "inflated",
  merged = TRUE,
  projection_smooth = 0L,
  use_cache = TRUE
)

Arguments

surfatlas: A surface atlas object inheriting from class "surfatlas".
views: Character vector of views to include. Any combination of "lateral", "medial", "dorsal", "ventral".
surface: Character scalar identifying the surface type label.
merged: Logical. If TRUE (default), returns merged parcel-level polygons (faster, fewer shapes). If FALSE, returns per-triangle polygons.
projection_smooth: Non-negative integer controlling Laplacian-like smoothing iterations applied to projected vertex coordinates before polygon and boundary construction. 0 (default) keeps native mesh coordinates.
use_cache: Logical. If TRUE (default), use memoized builders.

Value

A list with components:

polygons: A tibble of projected polygon vertices.
boundaries: A tibble of projected boundary segments.