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API improvements

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Improvements found while using the portals API in another mod (cloudlands):
* remote_portal_checkup() will check the whole portal and frame for mapgen overwrites.
* Allow find_realm_anchorPos() to return nil if no realm location could be found (portal will fail to ignite).
* Allow create_book_of_portals() to be invoked [indirectly] by other mods.

Also lowers nether_book_close.png to be 4bpp
This commit is contained in:
Treer
2020-02-08 18:00:01 +11:00
committed by SmallJoker
parent 32e5d818e8
commit 7939161535
6 changed files with 39 additions and 29 deletions
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9
portal_api.txt
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@ -22,11 +22,6 @@ one kind of portal with the same frame material — such as obsidian — provide
the size of the PortalShape is distinct from any other type of portal that is
using the same node for its frame, and portal sizes remain small.
Stone is not a good choice for portal frame nodes as the Minetest engine may
convert it into terrain nodes if the biome-pass occurs after the portal is
created. Similarly, avoid using nodes which may be replaced by ABMs or
docoration functions without triggering the node's `on_destruct` handler.
Realms
------
@ -200,7 +195,9 @@ Used by `nether.register_portal`.
within_realm = function(pos),
-- Required. Return true if a portal at pos is in the realm, rather
than the surface world.
-- than the surface world.
-- Ideally implementations are fast, as this function can be used to
-- sift through a list of portals.
find_realm_anchorPos = function(surface_anchorPos),
-- Required. Return a position in the realm that a portal created at