B4A Library Box2DLights

Box2DLights is a plugin for libGDX. It adds light sources to your Box2D scene. A light source can be attached to a body and move with it.
For more information about this library, please read this wiki.

v0.9:
Initial release

v1.0:
- Bugfixes
- New class: lgB2L_ChainLight
- New functions
- Better documentation
- New demo

v1.01:
- Incompatibility with libGDX v1.10 fixed;
- New function: lgB2L_RayHandler.ResizeFBO;
- Default soft shadow length set to distance * 0.1.

 

[walterf25]

Box2DLights is a plugin for libGDX. It adds light sources to your Box2D scene. A light source can be attached to a body and move with it.
For more information about this library, please read this wiki.

I'm not responsible for the approximate english of the documentation. Feel free to help me to improve it.

View attachment 23924

Very Nice Frederic, i'm going to give it a try today!

Thanks,
Walter

 

[ilan]

the examples are very good and easy to understand, thank you @Informatix

 

[andymc]

Could this be used to give "glowing" effects to retro style games?

 

[ilan]

Could this be used to give "glowing" effects to retro style games?

do you mean like a frame on the character?

 

[andymc]

yes, and maybe glowing around objects like laser bolts or gridlines, so you could write an asteroids game with glowing rocks and spaceship

 

[ilan]

yes you can, like you can see in the first post (informatix glowing objects)

 

[Informatix]

You could do that with the lib BUT I recommend instead to pre-render the glowing effect and play it as an animation. You will save FPS this way.

 

[andymc]

okay, I did something similar with my space invaders game, I just rendered a transparent blue behind the aliens to give them the look of glowing.

 

[andymc]

I'm also interested if this could be used to add lighting effects to overhead games to give a night time theme with lightning flashes, and the players having torches to look around, all viewed from above.

 

[Informatix]

I'm also interested if this could be used to add lighting effects to overhead games to give a night time theme with lightning flashes, and the players having torches to look around, all viewed from above.

This is what is done for.

 

[wonder]

In my current project I'm not using Box2D at all.
Nevertheless I'd like to utilize this library in order to have some cool lighting effects.

Would I have to replicate each game object as a Box2D object or could I just associate a Box2DLight object to a posX, posY of one of my current objects?

Thanks in advance!

 

[Informatix]

Would I have to replicate each game object as a Box2D object

No. You can either attach the light to a body (with AttachToBody) or set its position (with Position.Set). If objects entering the light radius are not Box2D objects, the rays cannot be stopped so there will be no shadow.

 

[wonder]

Understood, thanks Fred!
Are there any other lighting effects or ways to achieve a similar effect using just the "regular" LibGDX functions? Shaders, perhaps?

 

[ilan]

Understood, thanks Fred!
Are there any other lighting effects or ways to achieve a similar effect using just the "regular" LibGDX functions? Shaders, perhaps?

I recommend instead to pre-render the glowing effect and play it as an animation. You will save FPS this way.

Example: https://b4x.com/android/forum/threads/glowing-ball-status-approved.49833/

 

[Informatix]

Understood, thanks Fred!
Are there any other lighting effects or ways to achieve a similar effect using just the "regular" LibGDX functions? Shaders, perhaps?

The lights of this library are made with shaders.

 

[ilan]

hi @Informatix in your ChainLight example it says that the polygons were created with Polygon Editor v0.2.1

'Complex shape created with Physics Body Editor v2.9.2 and Polygon Editor v0.2.1

i could not find such an editor, i only am able to find the Physics Body Editor. Do you have maybe a link?

thanx, ilan

 

[Informatix]

hi @Informatix in your ChainLight example it says that the polygons were created with Polygon Editor v0.2.1



i could not find such an editor, i only am able to find the Physics Body Editor. Do you have maybe a link?

thanx, ilan

The link should be somewhere in the libGDX guide.

 

[Almora]

Nice..