set_positioning: Set hemisphere positioning mode

In ggseg3d: Interactive 3D Brain Atlas Visualization

Set hemisphere positioning mode

Description

Repositions cortical hemisphere meshes in a ggseg3d widget. Meshes are produced with anatomical positioning by default (medial edges at x = 0). Use this to centre each hemisphere at the origin for atlas-creation snapshots, or to reapply anatomical positioning after manual edits.

Usage

set_positioning(p, positioning = c("anatomical", "centered"))

Arguments

p	ggseg3d widget object
positioning	How to position hemispheres: - "anatomical": Medial surfaces adjacent at midline. Left at negative x, right at positive x. Default for displaying both hemispheres together. - "centered": Centre each hemisphere at the origin. Best for single-hemisphere snapshots where consistent sizing is needed.

Details

Only cortical hemisphere meshes are repositioned (those named '"<hemi> <surface>"', e.g. '"left inflated"'). Subcortical, cerebellar and glassbrain meshes are left untouched.

Value

ggseg3d widget object with repositioned meshes

Examples

# View both hemispheres anatomically positioned (default)
ggseg3d(hemisphere = c("left", "right")) |>
  pan_camera("left lateral")

# Atlas creation: centered for consistent sizing
ggseg3d(hemisphere = "left") |>
  set_positioning("centered") |>
  set_orthographic() |>
  pan_camera("left lateral")

ggseg3d documentation built on April 22, 2026, 5:09 p.m.