Strange instancing behaviour

klaas

Hello everyone im currently stuck with a strange behaviour of godot when instancing the line renderer in the assetLib.

When i put two line renderer in my scene and edit the points of the array in the editor and run the game everything looks fine. My script can then manipulate the points and they get rendered fine.

But ... when i put two line renderer into the scen and they have the exact same settings they seem to two merge somehow. When i manipulate the points via script only one gets rendered properly. The other one periodically pops up sometimes.

Did anyone other expirienced this behaviour? Did i miss something?

klaas

after some research i've found out ... the points array of the line renderer is inititlized like so

export var path_points = [Vector3(0,0,0),Vector3(0,5,0)]

if im copy it like

points = [] + path_points

in the _ready function it works

did that mean an instanced scene shares its initial/default properties but not ist runtime properties.

Thats confusing!

Is there any documentation on how this behaviour works in depth?

TwistedTwigleg

@klaas said: after some research i've found out ... the points array of the line renderer is inititlized like so
`export var path_points = [Vector3(0,0,0),Vector3(0,5,0)]`
if im copy it like
`points = [] + path_points`
in the _ready function it works

did that mean an instanced scene shares its initial/default properties but not ist runtime properties.

Thats confusing!

Is there any documentation on how this behaviour works in depth?

Huh, that is strange and not what I would have expected as the solution. I will have to remember this for later, as I have had a few issues with lists/arrays in Godot previously where this snippet might come in handy. Thanks for sharing the solution you found!

Unfortunately I do know of any documentation on this type of behavior right off, but if I spot something I'll post it here.

(Side note: Welcome to the forums! :smile:)

klaas

there is a slight copy paste error in my previous post, so to clearify

the points array of the line renderer is inititlized like

export var points = [Vector3(0,0,0),Vector3(0,5,0)]

and i changed it to

export var path_points = [Vector3(0,0,0),Vector3(0,5,0)]

and i added this to the ready function

points = [] + path_points

so if you instanciate a object and dont modify the defaults (witch happens when you instanciate via scripting), at least the arrays seem to be handled by reference but if you create/overwrite it on runtime every instance got its own referenced array