Let There Be Light 2

[DJuego]

Yes. Thanks Cmdu76. Thanks. Thanks. Thanks! Any evolution of this extension is a great news.

In my opinion LTBL2 is one of the more interesting projects in the SFML cosmos (yes thor too  ). Damn! It is one of the more interesting projects in the 2D graphics universe (!). 

Your changes seem fantastic. I will try to test them so soon be possible for me in Mingw-builgs gcc 6.2.0 and Visual Studio 2015.

I like very much the header-only proposal but if you need to add the LetThereBeLight.hpp & LetThereBeLight.cpp... is it header-only?  Anyway i am happy. This is the joy of the day for me. 

DJuego

[Cmdu76]

I worked using VS2015 and I haven't tested it elsewhere yet.

Okay that is not really header-only, I read that having .cpp is better for compilation time.

I hope people will test it and give me some feedback.

I'm also working on the normals, I'm getting inspired by the implementation of Breush, here : https://github.com/JumpingToasts/LTBL2

The normals aren't in the two files, yet. I'm waiting a good implementation for normals

[Guido_Ion]

Thanks Cmdu76! I've been using LTBL2 for some time now ( video: [EDIT: new better video] ) It's great, the main problem I have is the performance though. I'm going to try your version and give you some feedback.

[Cmdu76]

Today, I added my version of LTBL2 in my engine.

The previous version of a demo game using the main version of LTBL2 was running at 45 FPS,
The new version of this demo game using my version of LTBL2 is running at 55 FPS.

That is a small improvement but still good anyway. (+22%)


There is still something uncool with it, I was working on normals, but I'm not a graphical expert. I haven't succeed in adding that functionnality.
I added some code an interface to provide it but there is still a problem somewhere that don't render the normals...
It would be so great if anyone can help there

[R23MJ]

First off: Thank you Cmdu76 for picking this project up!

Secondly, maybe this has been mentioned before, and there is probably a simple answer for it, but shouldn't the light be blocked by the side of the object that is facing it? I took some screenshots to help explain that. Look at the following.

(click to show/hide)

Everything looks fine when you draw whatever is blocking the light. Check out what happens when you don't though.

(click to show/hide)

The side of the box opposite to the light is blocking the light.. For most people this probably isn't a problem; however, in my project, I don't plan to draw the light blockers. Maybe this is intentional, I'm not sure, maybe you could look at it Cmdu76?

To further explain what I mean, I edited the second image to produce what I would expect the result to be.
(Or similar to this)

(click to show/hide)

EDIT::
To, again, further explain, I would expect the result to be the above because we are lighting in a 2D world, meaning the side of the block facing us could have any depth, in a 2D world that wouldn't be measure. For the light to shine on the side of the block facing the player we would have to assume the light is 3D, that is, it has enough depth to light the top of the block, and it is also positioned closer the the player, meaning it is on a different plane that the object it is shining light on.

[Cmdu76]

lolz123 added this functionnality but as the project wasn't documented most people doesn't noticed it.

You can use :

shape->setRenderLightOver(true); // If you use my version
shape->_renderLightOverShape = true; // If you use lolz123 version's

Edit : I tested it, and the result wasn't what I expected, I'll take look...

[R23MJ]

I simulated the effect I wanted simply by setting the objects color to the light systems ambient color. Works unless you use alpha.

[Ezhoikam]

Is it possible to use it with the isometric tiled maps?

[Cmdu76]

@R23MJ

I hadn't the time to really look at it...
But you can try something like that :

sf::RectangleShape shape;
shape.setSize({ 200.f, 50.f });
shape.setPosition({ 500.f, 300.f });
shape.setFillColor(lightSystem.getAmbientColor());
lightSystem.createLightShape(shape);

And then draw your shape

@Ezhoikam

Isometric usually divide y-axis length by 2, but I suggest you to try. The effect might be good depending on the render you want.

[smguyk]

Cmdu76 I'm trying to use your version but I'm getting these errors:

(click to show/hide)

1>------ Build started: Project: lbtltest, Configuration: Debug Win32 ------
1>  main.cpp
1>  main-cmdu76.cpp
1>  LetThereBeLight.cpp
1>  Generating Code...
1>main-cmdu76.obj : error LNK2005: "public: void __thiscall ltbl::priv::BaseLight::toggleTurnedOn(void)" (?toggleTurnedOn@BaseLight@priv@ltbl@@QAEXXZ) already defined in LetThereBeLight.obj
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: __thiscall ltbl::Sprite::Sprite(void)" (??0Sprite@ltbl@@QAE@XZ) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: void __thiscall ltbl::Sprite::setTexture(class sf::Texture &,bool)" (?setTexture@Sprite@ltbl@@QAEXAAVTexture@sf@@_N@Z) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: void __thiscall ltbl::Sprite::setNormalsTexture(class sf::Texture &)" (?setNormalsTexture@Sprite@ltbl@@QAEXAAVTexture@sf@@@Z) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: void __thiscall ltbl::Sprite::render(class sf::RenderTarget &,class sf::RenderStates)" (?render@Sprite@ltbl@@QAEXAAVRenderTarget@sf@@VRenderStates@4@@Z) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: __thiscall ltbl::LightSystem::LightSystem(bool)" (??0LightSystem@ltbl@@QAE@_N@Z) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: void __thiscall ltbl::LightSystem::addSprite(class ltbl::Sprite &)" (?addSprite@LightSystem@ltbl@@QAEXAAVSprite@2@@Z) referenced in function _main
1>c:\users\admin\documents\visual studio 2012\Projects\lbtltest\Debug\lbtltest.exe : fatal error LNK1120: 6 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

What do I have to do? :/

I also tried the original version but I can't compile that one either because make_unique and other c++14 stuff isn't supported on my compiler

edit: yeah it was due to old files it's fixed now thank you!

[Cleroth]

Why are you using VS2012?

[Guido_Ion]

Cmdu76 I'm trying to use your version but I'm getting these errors:

(click to show/hide)

1>------ Build started: Project: lbtltest, Configuration: Debug Win32 ------
1>  main.cpp
1>  main-cmdu76.cpp
1>  LetThereBeLight.cpp
1>  Generating Code...
1>main-cmdu76.obj : error LNK2005: "public: void __thiscall ltbl::priv::BaseLight::toggleTurnedOn(void)" (?toggleTurnedOn@BaseLight@priv@ltbl@@QAEXXZ) already defined in LetThereBeLight.obj
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: __thiscall ltbl::Sprite::Sprite(void)" (??0Sprite@ltbl@@QAE@XZ) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: void __thiscall ltbl::Sprite::setTexture(class sf::Texture &,bool)" (?setTexture@Sprite@ltbl@@QAEXAAVTexture@sf@@_N@Z) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: void __thiscall ltbl::Sprite::setNormalsTexture(class sf::Texture &)" (?setNormalsTexture@Sprite@ltbl@@QAEXAAVTexture@sf@@@Z) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: void __thiscall ltbl::Sprite::render(class sf::RenderTarget &,class sf::RenderStates)" (?render@Sprite@ltbl@@QAEXAAVRenderTarget@sf@@VRenderStates@4@@Z) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: __thiscall ltbl::LightSystem::LightSystem(bool)" (??0LightSystem@ltbl@@QAE@_N@Z) referenced in function _main
1>main-cmdu76.obj : error LNK2019: unresolved external symbol "public: void __thiscall ltbl::LightSystem::addSprite(class ltbl::Sprite &)" (?addSprite@LightSystem@ltbl@@QAEXAAVSprite@2@@Z) referenced in function _main
1>c:\users\admin\documents\visual studio 2012\Projects\lbtltest\Debug\lbtltest.exe : fatal error LNK1120: 6 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

What do I have to do? :/

I also tried the original version but I can't compile that one either because make_unique and other c++14 stuff isn't supported on my compiler

Maybe you should rebuild the entire solution, VS might not have recognized that you changed some files.

[Guido_Ion]

Hey, I'm having trouble getting this effect: I need occluders to cast shadows over other occluders like this:



I need the box on the bottom to be affected by the box on the top (meaning: be in the dark), like the player is.
In (1) player and grey box are visible and on (2) only the player is in the dark while the grey box isn't affected by the shadow of the big box.
Any idea on how to achieve this?

[DarkRoku12]

Hey, I'm having trouble getting this effect: I need occluders to cast shadows over other occluders like this:



I need the box on the bottom to be affected by the box on the top (meaning: be in the dark), like the player is.
In (1) player and grey box are visible and on (2) only the player is in the dark while the grey box isn't affected by the shadow of the big box.
Any idea on how to achieve this?

I was messing with this severals months ago, i couldn't reach a reliable way to solve this issue, but you can try the method "renderLightOverShape"

[Ungod]

I use ltbl2 in my game "Last of the Ambaras" now   Just wanted to share some impressions. I refactored the framework to support my own quad-tree and modified the interface. I didnt see ltbl2 in a top-down-game before, so I guess some of you might be interested in how it could look.