Initialize icosahedron geometry — hexify_build_icosa • hexify

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)

Value

Invisible NULL. Called for side effect.

Details

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

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)