[LUA] Get any entity in world with "health" ?

[dennis]

Hi all,

 

I was wondering how I can get any entity in the world with a certain variable inside such as "health"?

This is because I am making a script with exploding stuff in it. but when something near it with the health variable, it has to get the same amount of damage too.

 

Thanks in common.

[Josh]

For explosions, this function will quickly gather all entities in an area. It works independently from scene size, so no matter how many entities there are in the distance, this will be fast without having to loop through everything in the world:

http://www.leadwerks.com/werkspace/page/api-reference/_/world/worldforeachentityinaabbdo-r66

[thehankinator]

I'd use GetEntityNeighbors() function in Scripts/Functions/GetEntityNeighbors.lua.

 

You could do something like:

local radius = 10
local entities = GetEntityNeighbors(self.entity, radius, true)

for e=1, #entities do
 if entities[e].script.health ~= nil then
   --deal damage
 end
end

Edited July 6, 2016 by thehankinator

[dennis]

I'd use GetEntityNeighbors() function in Scripts/Functions/GetEntityNeighbors.lua.

 

You could do something like:

local radius = 10
local entities = GetEntityNeighbors(self.entity, radius, true)

for e=0, #entities do
if entities[e].script.health ~= nil then
--deal damage
end
end

 

Won't work for me, it gave me: 119 : attempt to index a nil value.

[macklebee]

Won't work for me, it gave me: 119 : attempt to index a nil value.

Did you import the GetEntityNeighbors script into your script before trying to use the above code?

[dennis]

Did you import the GetEntityNeighbors script into your script before trying to use the above code?

Yes, I have.

It gave me the error on:

 if entities[e].script.health ~= nil then

[mdgunn]

As a guess, maybe check the entity has a script exists before you access something on it?

 

Some entities coming back are probably not the ones you want to look at and may not have scripts.

[dennis]

As a guess, maybe check the entity has a script exists before you access something on it?

 

Some entities coming back are probably not the ones you want to look at and may not have scripts.

Entities next to it (between the radius of 10) are my character and another object with that value. I am not getting why it wouldn't work.

I can't really return the values using System:Print() because we can't print tables to the system. So I don't know what is returned

 

I tried another value in the same script, but it is still a Nil value.

So I guess the:

 

for e=0, #entities do
end

isn't working.

[macklebee]

It should be:

for e=1, #entities do

 

end

[dennis]

It should be:

for e=1, #entities do

 

end

 

Macklebee ! you're the hero of today

Completely works.

[thehankinator]

It should be:

for e=1, #entities do

 

end

Good catch! Old habits die hard.