Can I serialize scene out of the box?

Disorder · February 16, 2018, 12:59pm

Hi there. I’ve found pc.SceneParser, but how can I make json of scene for this parser? Do you have any integrated function?

mikefinch · February 16, 2018, 2:04pm

As I know, it uses by loadSceneHierarchy to parse scene from json file. You probably can debug this function, make brakepoint somewhere inside and get your data from json and just save it.

But its cheating, I guess.

Disorder · February 16, 2018, 2:07pm

I’ve tried to do this with no luck This is tricky to find such feature in sources. I need to save my entities dynamically in script, not initial state from editor

mikefinch · February 16, 2018, 2:28pm

I’ll do it in a hour, okay.

mikefinch · February 16, 2018, 3:44pm

So you can get your scene data by this way:

var myScene;

editor.call('loadScene', yourSceneId, function (err, scene) {
     myScene = scene;
}, false);

Then you can save your scene in json or parse it:

var jsonScene = JSON.stringify(myScene);

var parser = new pc.SceneParser(pc.app);
parser.parse(myScene);

But this is a Editor-level feature, you have to avoid using this.

Disorder · February 16, 2018, 4:18pm

I need this feature without editor) So, if I will try to stringify scene, I get circular structure error

mikefinch · February 16, 2018, 4:25pm

Obtaining scene hierarchy by this way is a Editor feature. And it’s cheating, I guess.

Try to get rid of it. My scenes had no errors.

Disorder · February 16, 2018, 4:29pm

By the way, Three.js has this feature

mikefinch · February 16, 2018, 4:31pm

Nice to know, PlayCanvas has too, but it’s little complicated, as you can see.

yaustar · February 16, 2018, 7:27pm

Just to be clear, are you looking for a way to export a current scene to JSON so you can load it again via SceneParser?

Disorder · February 16, 2018, 7:42pm

Exactly! I want to save my scene to json and load it via parser again.
Now I’m making my own serializer function, but may be I’m wasting time and this function already exists?

Disorder · February 20, 2018, 9:24am

Well, it seems, I have to write this by myself… I’m not lazy, just if you have decode function, it should be code function too

mikefinch · February 20, 2018, 10:59am

Okay, if you don’t trust me, then trust my code.

https://playcanvas.com/project/536664/overview/test-scene-export

Take a look at SceneChange script in assets.

You can press 3 on keyboard to load scene from text asset

Disorder · February 20, 2018, 11:17am

this script is not attached to any node))
And why targetScene is typed as string?

mikefinch · February 20, 2018, 11:19am

Camera. It’s attached to camera. Just press 3 and see what’s happening.

To parse this scene.

Disorder · February 20, 2018, 11:46am

nope, it isn’t

mikefinch · February 20, 2018, 11:48am

It is. Scene main 2

Disorder · February 20, 2018, 11:48am

Even if I use your code in console

yaustar · February 20, 2018, 11:50am

@mikefinch I think @Disorder is looking for a way to get the scene JSON at runtime in an app. For example, like he is making a level editor.

mikefinch · February 20, 2018, 11:52am

Scene structure is pretty simple, I don’t think he could faced with problems.