Unreal.js

anonymous_user_089fe201 · February 17, 2017, 3:55pm

I just have updated to support 4.15. (GitHub - ncsoft/Unreal.js-core: Unreal.js plugin submodule)

Flashback · February 23, 2017, 7:01pm

Great! Thanks, nako_sung. Is it coming to marketplace, or you’re too busy and we should just build it from source from now on?

anonymous_user_089fe201 · February 24, 2017, 2:26pm

I’m quite busy now. But next week I’ll be on a trip to GDC so I think there can be enough time to submit a build in a hotel room.

Flashback · February 24, 2017, 5:28pm

No pressure, and thanks =) Building from source is perfectly fine, it’s just a question of convenience for plugin users. Marketplace and auto-updates made programmers lazy

anon48630370 · March 30, 2017, 11:29pm

Is there a way to create a custom c++ class and have it call javascript functions. Is there a way to call custom methods inside the c++ class from javascript?

anonymous_user_089fe201 · March 30, 2017, 11:42pm

You can call all functions declared as UFUNCTION. (Reflection)

anon48630370 · March 31, 2017, 12:25am

Thanks for the quick response. So how could I call a static javascript function from c++? How can I pass a reference to an object to javascript and have it call a method in javascript?

anonymous_user_089fe201 · March 31, 2017, 12:04pm

There are several example projects available on GitHub - ncsoft/Unreal.js-demo: Demo project for unreal.js. You can expose some WKO’s(well-known-objects are accessed with global var names) and you can keep your JS functions as unreal engine’s delegates to call back later.

anonymous_user_76795f21 · April 14, 2017, 4:37pm

Trying to return a variable to a blueprint from the javascript code

Hey There! Thanks for this plugin, its great! currently using it as part of my University Dissertation project

I’ve been trying to figure out how I can return a variable from JS to a blueprint. I can call the function fine but i cant get the variable to be passed back :S
I found the page on UPROPERTY on the wiki but even with the flags the value will not be passed back for osme reason, I’ve never used this flags before so Im sorry in advanced if this is such a rookie mistake


        GetServerID(_posX/*int*/ , _posY/*int*/ , $/*return+int*/ ) {
            console.log(GetServID(_posX, _posY));                      //Prints correctly
            console.log(typeof _posX);                                      //Prints correctly
            return _serverGrid[_posY][_posX].id/*return+int*/ ;   //Returns 0 always, even with hard-coded value
        }

Im using the plugin from the marketplace with version 4.14.3 of UE4.

Any help or hints is greatly appreciated!

anonymous_user_089fe201 · April 17, 2017, 9:45pm

You can declare a parent BP with function having proper signature and override that function with your JS class. Or you may leave return value to some member variable, so BP can read from it.

Good luck!

anonymous_user_089fe201 · April 18, 2017, 10:18pm

Updated build (4.15) is now online.

anonymous_user_46a225c1 · April 19, 2017, 5:01pm

I really am enjoying the plugin so far, but I can’t seem to find any information on creating Enums. Or loading structs and enums that have been made in the editor , is this possible right now? Maybe I missed something in the example…

anonymous_user_0f0a0fe3 · April 30, 2017, 1:05pm

@marynate how to make projecet support android with Unreal.js plugin

anonymous_user_089fe201 · April 30, 2017, 8:16pm

You can create enum (someUEObj).CreateEnum(‘EnumName’,‘ABC’,‘DEF’,‘GHI’]).

github.com

ncsoft/Unreal.js-core/blob/31e28c2c406c65a4c47ae2d8fe41e608290a8be0/Source/V8/Public/JavascriptLibrary.h#L436


      
          	UFUNCTION(BlueprintCallable, Category = "Scripting | Javascript")
          	static void ClearFlags(UObject* Obj);
          
          
	UFUNCTION(BlueprintCallable, Category = "Scripting | Javascript")
          	static int32 GetMaskedFlags(UObject* Obj);
          
          
	UFUNCTION(BlueprintCallable, Category = "Scripting | Javascript")
          	static float GetLastRenderTime(AActor* Actor);
          
          
	UFUNCTION(BlueprintCallable, Category = "Scripting | Javascript")
          	static UEnum* CreateEnum(UObject* Outer, FName Name, TArray<FName> DisplayNames);
          
          
	UFUNCTION(BlueprintCallable, Category = "Scripting | Javascript")
          	static void MarkRenderStateDirty(UActorComponent* Component);
          
          
	UFUNCTION(BlueprintCallable, Category = "Scripting | Javascript")
          	static void ReregisterAllComponents(AActor* Actor);
          
          
	UFUNCTION(BlueprintCallable, Category = "Scripting | Javascript")
          	static bool SegmentIntersection2D(const FVector& SegmentStartA, const FVector& SegmentEndA, const FVector& SegmentStartB, const FVector& SegmentEndB, FVector& IntersectionPoint);

Flashback · June 2, 2017, 2:35pm

Thanks for GitHub update to 4.16, nako_sung. Very minor thing: project files generator reports a warning. In JavascriptGraphEditor.Build.cs, line 7 should probably be


public JavascriptGraphEditor(ReadOnlyTargetRules Target) : base(Target)

instead of just


public JavascriptGraphEditor(ReadOnlyTargetRules Target)

benicourt · June 25, 2017, 9:08pm

Hi Everybody,
I’ve tried to use Three.js in “node_modules” directory but i don’t know what i have to include in the JS file to use it ? (npm xxx ?)
Could you help me please ?

Sixmorphugus · August 19, 2017, 9:36pm

@nako_sung
Hi,
I’m wondering about how you compiled a version of V8 that unreal can use? When I try to import the library for my own plugin it results in mismatch errors like this:

I notice unreal.js has four v8_base libs.

duke22 · September 3, 2017, 9:17am

Say I have an class extending Actor in my js file, how do I reference that UClass in C++?

anonymous_user_58db918e · October 11, 2017, 5:05pm

I get an error when trying to run any of the example scripts.

[FONT=courier new]Context.RunFile(“HelloCanvas.js”)
[FONT=courier new]< undefined
[FONT=courier new]Error: file:///c:/Code/UnrealJS/Content/Scripts/helloCanvas.js:8: ReferenceError: GWorld is not defined
[FONT=courier new]Error: ReferenceError: GWorld is not defined
[FONT=courier new]Error: at GetPC (file:///c:/Code/UnrealJS/Content/Scripts/helloCanvas.js:8:35)
[FONT=courier new]Error: at main (file:///c:/Code/UnrealJS/Content/Scripts/helloCanvas.js:13:9)
[FONT=courier new]Error: at process.nextTick (file:///c:/Code/UnrealJS/Content/Scripts/helloCanvas.js:56:46)
[FONT=courier new]Error: at invoke_next (file:///c:/Code/UnrealJS/Plugins/UnrealJS/Content/Scripts/polyfill/timers.js:14:9)
[FONT=courier new]Error: at Array.forEach (<anonymous>)
[FONT=courier new]Error: at Object.flushTicks (file:///c:/Code/UnrealJS/Plugins/UnrealJS/Content/Scripts/polyfill/timers.js:36:18)
[FONT=courier new]Error: at root (file:///c:/Code/UnrealJS/Plugins/UnrealJS/Content/Scripts/polyfill/timers.js:20:24)

I have downloaded the plugin source from git hub, placed it in my project’s Plugin folder and rebuilt when launching the project. The plugin shows up and the JavascriptConsole works.

Is there something simple that I’m missing?

*Solved: I realized that all of these scripts have to be run from within the Examples project. But it’s not so straight forward to get the unreal.js plugin built for a source version and then get the Examples project to work

Here’s what I did - maybe this will help someone else:*

*Installed the unreal.js plugin from the marketplace under my binary version of UE4.17. *
Started the binary version and built the plugin.
Enabled the plugin and tried the JavaScript console (under Window->Developer Tools)
Then copied the compiled engine plugin to my source version of UE4.17, and of course it wants to rebuild again.
Enabled the plugin on my source engine.
Git clone of the example project into a new folder.
Deleted the Plugins folder in the example project, since I now already have the engine plugin work.
Loaded the example project.
Tested various maps - and they work!

anonymous_user_58db918e · October 12, 2017, 1:53pm

console.log - not getting any output to the JavascriptConsole.
Where does the output go?

(see attached pic).