A little explanation after I successfully decyphered this.

--HG--
branch : gsoc2013-dfighter

code/nel/src/3d/driver/OpenGL3/driver_glsl_shader_generator.cpp

@@ -342,11 +342,13 @@ namespace NL3D
 		ss << "vec4 n = normalize( vnormal ); //normalized normal" << std::endl;
 		ss << "vec4 T; // second basis, Tangent" << std::endl;
 		ss << "T = texCoord1;" << std::endl;
+		ss << "T = T - n * dot( N, T ); // Gramm-Schmidt process" << std::endl;
 		ss << "T = normalize( T );" << std::endl;
 		ss << "vec4 B;" << std::endl;
-		ss << "B.xyz = cross( n.xyz, T.xyz );" << std::endl;
+		ss << "B.xyz = cross( n.xyz, T.xyz ); // B = N x T" << std::endl;
 		ss << "vec4 L = lightPos - vposition; //Inverse light vector" << std::endl;
 		ss << "L = normalize( L );" << std::endl;
+		ss << "L * [ T B N ]" << std::endl;
 		ss << "cubeTexCoords0.x = dot( T.xyz, L.xyz );" << std::endl;
 		ss << "cubeTexCoords0.y = dot( B.xyz, L.xyz );" << std::endl;
 		ss << "cubeTexCoords0.z = dot( n.xyz, L.xyz );" << std::endl;

code/nel/src/3d/meshvp_per_pixel_light.cpp

@@ -98,7 +98,7 @@ MUL R6, v[2], R1;																			\n\
 																						\n\
 #normalize the second vector															\n\
 DP3	R1, R6, v[9];																		\n\
-MAD	R1, R6, -R1, v[9]; #subtract the normal component									\n\
+MAD	R1, R6, -R1, v[9]; #subtract the normal component, Gramm-Schmidt process			\n\
 DP3 R2, R1, R1;																			\n\
 RSQ	R2, R2.x;																			\n\
 MUL R5, R1, R2;	#second basis vector in R5												\n\