hexify_build_icosa: Initialize icosahedron geometry

In hexify: Equal-Area Hex Grids on the 'Snyder' 'ISEA' 'Icosahedron'

Initialize icosahedron geometry

Description

Sets up the icosahedron state for ISEA projection. Uses standard ISEA3H orientation by default (vertex 0 at 11.25E, 58.28N).

Usage

hexify_build_icosa(
  vert0_lon = ISEA_VERT0_LON_DEG,
  vert0_lat = ISEA_VERT0_LAT_DEG,
  azimuth = ISEA_AZIMUTH_DEG
)

Arguments

vert0_lon	Vertex 0 longitude in degrees (default ISEA_VERT0_LON_DEG)
vert0_lat	Vertex 0 latitude in degrees (default ISEA_VERT0_LAT_DEG)
azimuth	Azimuth rotation in degrees (default ISEA_AZIMUTH_DEG)

Details

The icosahedron is initialized lazily at the C++ level when first needed. Manual call is only required for non-standard orientations.

Value

Invisible NULL. Called for side effect.

See Also

Other projection: hexify_face_centers(), hexify_forward(), hexify_forward_to_face(), hexify_get_precision(), hexify_inverse(), hexify_projection_stats(), hexify_set_precision(), hexify_set_verbose(), hexify_which_face()

Examples

# Use standard ISEA3H orientation
hexify_build_icosa()

# Custom orientation
hexify_build_icosa(vert0_lon = 0, vert0_lat = 90, azimuth = 0)

hexify documentation built on March 1, 2026, 1:07 a.m.