Build brain polygon render data for a surface atlas — build_brain_polygon

Projects surface atlas geometry into 2D polygon panels for each hemisphere and view. Results are memoised so repeated calls with identical arguments return cached data.

Usage

build_brain_polygon_data(
  surfatlas,
  views,
  surface,
  projection_smooth = 0L,
  depth_cull = TRUE
)

Arguments

surfatlas: A surfatlas object (e.g. from schaefer_surf()).
views: Character vector of views to render (e.g. c("lateral", "medial")).
surface: Character: surface type ("inflated", "pial", "white").
projection_smooth: Integer: number of Laplacian smoothing iterations on projected coordinates (default 0L).
depth_cull: Logical. If TRUE (default), remove faces hidden behind nearer cortical surface faces in the projected view.

Value

A list with two elements:

polygons: Tibble of 2D projected polygon vertices with columns x, y, poly_id, parcel_id, label, hemi, view, panel.
boundaries: Tibble of boundary edges with columns x, y, xend, yend, panel.