Fix shader specular lighting (again)

files/shaders/lighting.glsl

@@ -74,9 +74,10 @@ vec4 doLighting(vec3 viewPos, vec3 viewNormal, vec4 vertexColor, out vec3 shadow
 vec3 getSpecular(vec3 viewNormal, vec3 viewDirection, float shininess, vec3 matSpec)
 {
     vec3 lightDir = normalize(gl_LightSource[0].position.xyz);
-    float NdotL = max(dot(viewNormal, lightDir), 0.0);
-    if (NdotL < 0.0)
+    float NdotL = dot(viewNormal, lightDir);
+    if (NdotL <= 0.0)
         return vec3(0.,0.,0.);
     vec3 halfVec = normalize(lightDir - viewDirection);
-    return pow(max(dot(viewNormal, halfVec), 0.0), shininess) * gl_LightSource[0].specular.xyz * matSpec;
+    float NdotH = dot(viewNormal, halfVec);
+    return pow(max(NdotH, 0.0), max(1e-4, shininess)) * gl_LightSource[0].specular.xyz * matSpec;
 }