Improve normal maps on ground and walls

shader/lighting/texture.frag

@@ -9,19 +9,19 @@ float rad = lumRad.a;
 void main() {
   vec3 pos = texture(screenTexture, vTexPos).xyz;
   vec3 distVec = pos - lightPos;
+  float dist = dot(distVec, distVec);
+  if (dist > rad) {
+    discard;
+  }
   vec4 normbit = texture(normals, vTexPos);
-  vec3 norm = normbit.xyz - pos;
+  vec3 norm = normbit.xyz;
   float y1 = dot(normalize(norm), normalize(distVec));
   float y2 = float(y1 > 0 ? 1 : 0);
   //float y3 = clamp(0.5 * (y1 + 1),0,1) ;
   float y3 = clamp(2*y1 + 1,0,1) ;
   //float y3 = clamp(0.5 * (y1 + 2),0,1) ;
-  float y = float(normbit.w == 0 ? y3 : y2);
+  float y = float(normbit.w == 0 ? y2 : y2);
   //float y = y2;
-  float dist = dot(distVec, distVec);
-  if (dist > rad) {
-    discard;
-  }
   float x = 1 - dist / rad;
   vec3 c = y* (x * x * x) * lumRad.rgb;
   fColor = vec4(c, 0);