nuclear@3: attribute vec3 attr_tang;
nuclear@3: 
nuclear@3: varying vec3 vpos, vnorm;
nuclear@3: varying vec3 ldir, vdir;
nuclear@3: 
nuclear@3: void main()
nuclear@3: {
nuclear@3: 	gl_Position = ftransform();
nuclear@3: 	vpos = (gl_ModelViewMatrix * gl_Vertex).xyz;
nuclear@3: 	vec3 norm = gl_NormalMatrix * gl_Normal;
nuclear@3: 	vec3 tang = gl_NormalMatrix * attr_tang;
nuclear@3: 
nuclear@3: 	vec3 n = normalize(norm);
nuclear@3: 	vec3 t = normalize(tang);
nuclear@3: 	vec3 b = cross(n, t);
nuclear@3: 
nuclear@3: 	mat3 tbn_mat = mat3(
nuclear@3: 			t.x, b.x, n.x,
nuclear@3: 			t.y, b.y, n.y,
nuclear@3: 			t.z, b.z, n.z);
nuclear@3: 	ldir = tbn_mat * (gl_LightSource[0].position.xyz - vpos);
nuclear@3: 	vdir = tbn_mat * -vpos;
nuclear@3: 	vnorm = n;
nuclear@3: 
nuclear@4: 	gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
nuclear@3: }