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Help modders deal with object invalidation (#14769)

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* Skip invalid objects in raycasts
* Add `ObjectRef:is_valid` method
* Add object inside radius / area iterators which skip invalid objects
* Update docs to clarify object invalidation and how to deal with it

---------

Co-authored-by: sfan5 <sfan5@live.de>
This commit is contained in:
Lars Müller 2024-07-01 20:50:38 +02:00 • committed by GitHub
parent d5444e1172
commit 8ed55b3aff
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GPG key ID: B5690EEEBB952194
6 changed files with 134 additions and 12 deletions
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13
src/script/lua_api/l_env.cpp
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@ -155,6 +155,7 @@ void LuaLBM::trigger(ServerEnvironment *env, v3s16 p,
int LuaRaycast::l_next(lua_State *L)
{
GET_PLAIN_ENV_PTR;
ServerEnvironment *senv = dynamic_cast<ServerEnvironment*>(env);
bool csm = false;
#ifndef SERVER
@ -163,7 +164,17 @@ int LuaRaycast::l_next(lua_State *L)
LuaRaycast *o = checkObject<LuaRaycast>(L, 1);
PointedThing pointed;
env->continueRaycast(&o->state, &pointed);
for (;;) {
env->continueRaycast(&o->state, &pointed);
if (pointed.type != POINTEDTHING_OBJECT)
break;
if (!senv)
break;
const auto *obj = senv->getActiveObject(pointed.object_id);
if (obj && !obj->isGone())
break;
// skip gone object
}
if (pointed.type == POINTEDTHING_NOTHING)
lua_pushnil(L);
else