Tweaks, drawing scene without illumination.
Problem Normals in _VertexShader

There is something going wrong with the floor (Grid - That is the Base
Class) normal.
->After the normal transformed result is not the expected. I suppose
that the illumination problem is with the normalMatrix after hard coded
the expected normal (0,1,0) the floor (#test1).
->In additional, I noticed that [to normalize a vec4 and extract a vec3
from it] is different of [to get a vec3 from a vec4 and then normalize
the vec3]. (#test2)