Bump mapping with several texture

[Shomaa]

Hello ,

I try to do some Per-Pixel Lighting with a mesh and several textures...
but it's REALLY possible ?

with a mesh and one texture :

Code: Select all

        video::ITexture* normalMap =
            driver->getTexture("../../media/rockwall_height.bmp");
        if (normalMap)
            driver->makeNormalMapTexture(normalMap, 9.0f);
       scene::IMesh* tangentMesh = smgr->getMeshManipulator()->
                createMeshWithTangents(roomMesh->getMesh(0));
room = smgr->addMeshSceneNode(tangentMesh);
        room->setMaterialTexture(0,
                driver->getTexture("../../media/rockwall.jpg"));
        room->setMaterialTexture(1, normalMap);

Ok here, it's not complicated....

but if our mesh is generated by Sketchup with several texture ? (in dae format)
Like this, we obtain the wrong results...

Code: Select all

        video::ITexture* normalMapRockwall =
            driver->getTexture("../../media/rockwall_height.bmp");
video::ITexture* normalMapFencing =
            driver->getTexture("../../media/fencing_height.bmp");
 
        if (normalMap)
            driver->makeNormalMapTexture(normalMapRockwall, 9.0f);
        if (normalMapFencing)
            driver->makeNormalMapTexture(normalMapFencing, 14.0f);
       scene::IMesh* tangentMesh = smgr->getMeshManipulator()->
                createMeshWithTangents(roomMesh->getMesh(0));
room = smgr->addMeshSceneNode(tangentMesh);
        room->setMaterialTexture(0,
                driver->getTexture("../../media/rockwall.jpg"));
        room->setMaterialTexture(1,
                driver->getTexture("../../media/fencing.jpg"));
        room->setMaterialTexture(2, normalMapRockwall);
        room->setMaterialTexture(3, normalMapFencing);
 
normalMapFencing
 

why ??

[Mel]

There is another way to set the textures. Check the getMaterial(u32 i); method from the ISceneNode. Using setMaterialTexture() changes all the materials from the scene node at once, not only one.

[hybrid]

If you use this material setting way, you're already using a different base material (maybe detail map or reflections material), so you have to write your own shader to provide the proper rendering with those textures. If you have multiple textures, you usually also have multiple mesh buffers, which need the different texture setting mechanism.

[Shomaa]

I use .irr file ,most of the time, (with coppercube).
And nothing explains the method for matches the correct height map or detail map
and the right texture (or material).

the code snippet above is here, for illustrate my questions.

So I must use shaders (HLSL) for Bump mapping ?

[hybrid]

Yes, if you set the material to BUMP_MAP or PARALLAX_MAP Irrlicht uses a shader to render the effect. This shader only works for two lights, no light settings, and no other texture effects. If you want to change this behavior, you have to provide your own shader.

[Shomaa]

ok thanks, i'll switch to the shaders then.