Shadow Problem

sudi · Post by **sudi** » Fri Dec 30, 2005 9:43 pm

Ok i got a problem with the stecil shadows in irrlicht:

I initialice my device like this:
//The Device
device = createDevice(EDT_OPENGL, dimension2d<s32>(config.x, config.y),
32,config.fullscreen, true, false, receiver);

and i load my mesh like this:

if(IAnimatedMesh* mesh = smgr->getMesh("media/meshes/bombermanX.x"))
{
pnode = smgr->addAnimatedMeshSceneNode( mesh );

// add shadow
//pnode->addShadowVolumeSceneNode();

//pnode->setParent(camera);
pnode->setScale(vector3df(10,10,10));

pnode->setRotation(vector3df(0,90,0));
//Position has to be changed
pnode->setPosition(position.get3df());

//Material_Fags
pnode->setMaterialFlag(EMF_ANISOTROPIC_FILTER ,true);
pnode->setMaterialFlag(EMF_NORMALIZE_NORMALS ,true);
pnode->setMaterialFlag(EMF_LIGHTING ,true);
}

when i load like this the scene looks normal but when i uncomment the shadow line then the whole scene goes dark and the frame rate drops to 1 or even below. does anyone has a clue?

razmott · Post by **razmott** » Sat Dec 31, 2005 10:54 am

Hi !

I know it's a old message but I've exactly the same problem.
Does anyone know ?

sudi · Post by **sudi** » Sun Jan 01, 2006 11:05 pm

sry but this is a serious problem...lol.....hey come on i don't know whats going wrong.

Rambus · Post by **Rambus** » Mon Jan 02, 2006 12:01 am

Perhaps ... you need to... Add a light to the scene...

krama757 · Post by **krama757** » Mon Jan 02, 2006 7:38 am

Aye, definately try adding a light to the scene

If it still doesnt work, please post all the code for us to help out.

razmott · Post by **razmott** » Mon Jan 02, 2006 12:52 pm

Hi !

I've a light in.
I've test with the example (SpecialFX), and I got the same problem !

Jan_ · Post by **Jan_** » Mon Jan 02, 2006 1:12 pm

what graphics card have you?

sudi · Post by **sudi** » Mon Jan 02, 2006 5:57 pm

same here got the light in the scene and it doesn't work
my card is a geforce4ti 4200

lostpencil · Post by **lostpencil** » Mon Jan 02, 2006 11:52 pm

Hey Guys,

I think you need to enable the stencil buffer on your createdevice call. The fifth parameter should be set to 'true'. Hope that helps.

sudi · Post by **sudi** » Mon Jan 02, 2006 11:59 pm

no that doesn't help!!!!
we enabled the stencial shadows.
otherwise there wouldn't be the performance drop and the dark scene!
but there is light in scene as well and i don't know whats going on

sudi · Post by **sudi** » Tue Jan 03, 2006 11:11 am

nobody?

lostpencil · Post by **lostpencil** » Tue Jan 03, 2006 4:21 pm

Hey Sudi,

Well, I have stencil shadows working and the code looks similar to yours.

Maybe it's the model? What about the surface that is 'catching' the shadow? Does it have enough faces to catch the light/shadow? What version of Irrlicht are you using (I'm playing with 0.14). If you want you can email me (paul@lostpencil.com) the model and I can plug it into my code and see if I get shadows.

lostpencil · Post by **lostpencil** » Tue Jan 03, 2006 4:27 pm

One thing that is different that I just noticed is that I'm using DirectX9, and not OpenGl.

sudi · Post by **sudi** » Tue Jan 03, 2006 6:34 pm

ok its really weird cause when i plug my loading code for the mesh in the special fx tutorial with opengl driver it works fine

lostpencil · Post by **lostpencil** » Tue Jan 03, 2006 8:39 pm

Hmm... doesn't sound like the model then...

Another thing I discovered when playing with shadows (at least using DirectX9) is that when the attenuation values for the light are set to strange values it can cause the scene to go black. A good set of values that seems to work for most cases:

Code: Select all

Attenuation0 = 0.0f;
Attenuation1 = 1.0f / Radius;
Attenuation2 = 0.0f

There is good information regarding these values in the directx documentation. I'm not sure what effect they have in OpenGl and I believe you have to play around with them in the Irrlicht code. I modified the engine so I can update them through the Slight structure.