shadows on mesh faces

[Icare]

Hi there,

I am trying to load a mesh object (so an obj file) into irrlicht.
When i load for example a cylinder, i cannot view different color for the faces.
All faces have the same gray, whatever i am doing, like moving the light, etc.

I have this :



when i want something like that :



here is my code :

Code: Select all

scene::ILightSceneNode* light1 = 0;
	light1 = SceneManager->addLightSceneNode();
	
	video::SLight lightdatas;    
	
	lightdatas.Position = core::vector3df(0, 0, 0);    
	lightdatas.Type = video::ELT_POINT;
	lightdatas.Radius=2.0f;
	lightdatas.AmbientColor = video::SColorf(0.3f,0.3f,0.3f,0.5f);
	lightdatas.SpecularColor= video::SColorf(0.4f,0.0f,0.0f,1);
	lightdatas.DiffuseColor = video::SColorf(1.0f,1.0f,1.0f,0.6f);
	lightdatas.CastShadows = false;
	
	light1->setLightData(lightdatas);

And for my IAnimatedSceneNode :

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iscenenode= t_pSceneMngr->addAnimatedMeshSceneNode(MyObject);
iscenenode->setMaterialType(video::EMT_LIGHTMAP_LIGHTING);
iscenenode->setMaterialFlag(video::EMF_NORMALIZE_NORMALS, true);
iscenenode->getMaterial(0).AmbientColor.set(255,255,255,255);
iscenenode->getMaterial(0).SpecularColor.set(255,255,255,255);

thanks,

[JP]

Why have you set the node's material to lightmap? Do you know what a lightmap is? It's a texture which is put on the model to give it pre-baked static lighting, rather than dynamic lighting from a light source.

So if you remove the line that sets it to lightmap material it could work.

Another thing that could be causing problems is that the normals are borked. For me .obj normals are always horrific, but they normally give some, fudged, lighting. If cutting out the lightmap material bit doesn't fix it try using the MeshManipulator (get it from your smgr) to recalculate the normals. (check the API/docs for the necessary functions)

[Icare]

Well, i have tested all the Material Type, no one works.

About the normals, i have no any normals in my obj file (only vertices and faces). So I will try to use the mesh manipulator to recalculate the normals.

[Icare]

Its working great when i recalculate the normals with the mesh manipulator !

thanks a lot !

Code: Select all

t_pSceneMngr->getMeshManipulator()->recalculateNormals(MyObject);

[hybrid]

OMG, I forgot to recalculate the normals in the loader Latest SVN trunk should have this feature...

[Icare]

Just a little last point :

These normals are wrong, no ?

[JP]

Hard to tell because the normals are being drawn in the wrong place, not sure why that would be though!

[hybrid]

The normals are often not drawn correctly. Try to getMesh(0) your mesh to get a static IMesh. Sometimes the normals are drawn better for those meshes.

[Icare]

I found that maybe my problem come from the left hand x, y, z axis in irrlicht doesn't corresponding to the right han x, y, z axis of my mesh...

Can i change the x, y, z axis of irrlicht to a right hand one ?

Thanks (i hope you will understand the left, right hand story, actually i don't know how to say that in irrlicht)

BTW, i can have good normals with normals from my obj file (and without recalculate normals with the mesh manipulator) but just at the position 0,0,0

more my cybe is far from the 0,0,0 point and more the normals are far from my cube !

here some pics :

a cube at (0,0,0)



a cube at (1,0,0)