Big problems with lights

texel3d · Post by **texel3d** » Sat Jul 25, 2009 8:49 am

Hi,

i have a big problem with lights.
I can't do what i want to do.
How can i put infinite point light ? Is is possible ? and how ?
How can i put directionnal light ?

The tutorials and examples only show how to use point light with attenuation. And The documentation is very limited, and when i follow the things that should be done it does not work.

When i try to use directionnal lights, i have always the light in the same direction.

Code: Select all

scene::ILightSceneNode* nodeLight = smgr->addLightSceneNode(0, core::vector3df(0, -1, 0),
		video::SColorf(1.0f,1.0f,1.0f,1.0f),
		20000.0f);
nodeLight->getLightData().Type = video::ELT_DIRECTIONAL;
nodeLight->getLightData().Direction = core::vector3df(1, 0, 0); 
nodeLight->getLightData().SpecularColor = video::SColorf(0.0f,0.0f,0.0f,1);
nodeLight->getLightData().AmbientColor = video::SColorf(0.0f,0.0f,0.0f,1);

Maybe my question is stupid, but i need help.
I use Irrlicht 1.5

Hirte · Post by **Hirte** » Sat Jul 25, 2009 9:11 am

You can only use 8 lights in your scene, it is a hardware limitation.
But in irrlicht 1.6 (SVN) there is a lightmanager with (theoretically) unlimited lights, but only up to 8 lights per object.

texel3d · Post by **texel3d** » Sat Jul 25, 2009 9:23 am

When i write "infinite light" i mean light without attenuation.
And what about my other problems ?

hybrid · Post by **hybrid** » Sat Jul 25, 2009 9:38 am

Did you dare to read the documentation? The light data clearly states that you're not supposed to alter Direction and Pos. You have to move and/or rotate the light scene node. This will give you a proper position of your point light and make your directional/spot light change its cone's direction. Attenuation can be changed by altering the attenuation

Simply set (1,0,0) and you have the effect disabled. Or do you want to set ambient light? This would go via the scene manager.

texel3d · Post by **texel3d** » Sat Jul 25, 2009 10:17 am

Ok. I understand now.
Some tutorial seems to be wrong on the web. They modify read only data of SLight (type).

Example:
http://www.portail-irrlicht.fr/wiki/ind ... c:irrLight
http://www.siteduzero.com/tutoriel-3-56 ... -soit.html

It's strange to mix read only and non read only data in the SLight.

I think i understand that i need to translate and rotate the light node to set new position/ direction.

But how to set the type to ELT_DIRECTIONAL if it is read only in SLight ? I don't find how to do that in the documentation.

hybrid · Post by **hybrid** » Sat Jul 25, 2009 10:48 am

The ILightSceneNode has all the required methods. The tutorials seem to be outdated, because the direct access was the method in 1.3 and earlier versions.

Keyosz · Post by **Keyosz** » Wed Jul 14, 2010 2:13 pm

If you want to do something like this:
http://www.youtube.com/watch?v=zK_MsOuKXzo
take a look here:
http://irrlicht.sourceforge.net/phpBB2/ ... 077#228077