It's amazing what Maratis can do. Both scenes look very close.

Two things are missing from this port. The reflection and ambiant occlusion texture. I think the default shader doesn't support them .

@anael I will try emit map tomorrow .

The emit map can be used to add light, for emit effects (lamp flickering) or to apply a baked lightmap,
it needs to be an rgb image, if you used a greyscale image it can explain why your mesh disappeared.
The texture is also affected by the "emit" value in the material properties.

You can also write your own shaders in glsl, here is an example : http://www.maratis3d.org/?p=548

I have discovered yesterday maratis when I was looking for an Unity3D open source clone.

To test it I tried to port the bathroom demo which shows some nice features of the blender game engine.

Here is my first sreenshoot

As you can see the result looks pretty good .

Next step:
-> Add the others objects
-> Add my own shader for the billboard
-> Improve the default shader to add detail map and ambiant occlusion mapping

However I have some issues and questions.
What is the purpose of emit map ? It's an additive layer ?
I think I found a bug. When I add an emit map the mesh disappears in maratis editor