FindObject cannot find any missiles

[Ephreaym]

object.ClassMissile seems not to be implemented?

if (ns.InCirclef{Center: wiz.unit, R: 200}).Matches(ns.FindClosestObject(wiz.unit, ns.HasClass(object.ClassMissile))) {
		wiz.unit.ChatStr("INVERT")
	}

I'm trying to add an inversion script. Script works fine on other classes, look a door. But I can't use ClassMissile.

[angrykirc]

This problem occurs because of the way the game engine treats these Missile objects.
They are not stored in the bucketByPos table, the one FindClosestObject function uses internally.

opennox/src/server/map.go

Lines 240 to 270 in 6f232cc

 func (s *serverMap) AddMissileXxx(obj *Object) { 
 	if f := obj.Flags(); f.Has(object.FlagDestroyed) || f.Has(object.FlagPartitioned) || !f.Has(object.FlagActive) { 
 		return 
 	} 
 	if !obj.Class().Has(object.ClassMissile) { 
 		obj.UpdateCollider(obj.NewPos) 
 		sp := RoundPos(obj.CollideP1) 
 		ep := RoundPos(obj.CollideP2) 
 		if sp.X < 0 { 
 			sp.X = 0 
 		} 
 		if sp.Y < 0 { 
 			sp.Y = 0 
 		} 
 		if ep.X >= s.indexSize { 
 			ep.X = s.indexSize - 1 
 		} 
 		if ep.Y >= s.indexSize { 
 			ep.Y = s.indexSize - 1 
 		} 
 		obj.ObjIndexCur = 0 
 		for y := sp.Y; y <= ep.Y; y++ { 
 			for x := sp.X; x <= ep.X; x++ { 
 				s.addObjToMap(true, image.Pt(x, y), obj) 
 			} 
 		} 
 	} 
 	pi := RoundPos(obj.NewPos) 
 	s.addObjToMap(false, pi, obj) 
 	obj.ObjFlags |= uint32(object.FlagPartitioned) 
 } 

Needs a workaround method, probably using 0x750700 (UpdatableList, non-missile global object table) and 0x750704 (UpdatableList2, missile global object table)

[Denys Smirnov]

Sorry, this is a known issue, forgot to open a ticket for it.

As @angrykirc pointed out, script searches the list that does not contain missiles. Will fix for the next Alpha.

[Ephreaym]

Getting a lot of errors. Script does run when a missile is detected.

package test

import (
	"github.com/noxworld-dev/noxscript/ns/v4"
	"github.com/noxworld-dev/opennox-lib/object"
)

var initReady bool
var Bot ns.Obj

func init() {
	initReady = false
	ns.NewTimer(ns.Seconds(2), func() {
		spawnBot()
	})

}

func spawnBot() {
	Bot = ns.CreateObject("NPC", ns.Ptf(2771, 3067))
	Bot.HasTeam(ns.GetHost().Team())
	initReady = true
}
func OnFrame() {
	if initReady {
		if (ns.InCirclef{Center: Bot, R: 200}).Matches(ns.FindClosestObject(Bot, ns.HasClass(object.ClassMissile))) {
			Bot.ChatStr("INVERT")
		} else {

		}
	}

}

2024/01/02 08:21:33 [script]: panic in OnFrame: runtime error: invalid memory address or nil pointer dereference
2024/01/02 08:21:33 [console]: V:\src\test\test.go:25:5: panic: test.OnFrame(...)

[Denys Smirnov]

That's likely because there's no spells to invert most of the time. Try this:

if sp := ns.FindClosestObject(wiz.unit, ns.HasClass(object.ClassMissile), ns.InCirclef{Center: wiz.unit, R: 200}); sp != nil {
        wiz.unit.ChatStr("INVERT")
}

In your case FindClosestObject returns nil most of the time and then Matches panics because it doesn't accept nil.