-- This originally was the floatlands example portal as in https://github.com/minetest-mods/nether/blob/master/portal_examples.lua
local OTHER_WORLDS_LEVEL = 22000

nether.register_portal(
    "asteroid_portal",
    {
        shape = nether.PortalShape_Platform,
        frame_node_name = "illuna:astroportal_block",
        wormhole_node_color = 5,
        particle_texture = {
            name = "nether_particle_anim1.png",
            animation = {
                type = "vertical_frames",
                aspect_w = 7,
                aspect_h = 7,
                length = 1
            },
            scale = 1.5
        },
        title = "Asteroid Portal",
        book_of_portals_pagetext = [[Requiring 21 blocks of ancient astro-portal blocks, and constructed in the shape of a 3 × 3 platform with walls, or like a bowl. A finished platform is 2 blocks high, and 5 blocks wide at the widest in both directions.
This portal is different to the others, rather than acting akin to a doorway it appears to the eye more like a small pool of water which can be stepped into. Upon setting foot in the portal we found ourselves at a tremendous altitude.]],
        is_within_realm = function(pos) -- return true if pos is inside the Nether
            return pos.y > OTHER_WORLDS_LEVEL - 200
        end,
        find_realm_anchorPos = function(surface_anchorPos, player_name)
            local destination_pos = {x = surface_anchorPos.x, y = OTHER_WORLDS_LEVEL + 2, z = surface_anchorPos.z}

            local existing_portal_location, existing_portal_orientation =
                nether.find_nearest_working_portal("asteroid_portal", destination_pos, 10, 0)
            if existing_portal_location ~= nil then
                return existing_portal_location, existing_portal_orientation
            else
                return destination_pos
            end
        end
    }
)