minor update - light ui tweak

enginecustom/sunlight.vs

@@ -19,8 +19,7 @@ cbuffer SunLightBuffer
     float4 ambientColor;
     float4 diffuseColor;
     float3 lightDirection;
-    float specularPower;
-    float4 specularColor;
+    float intensity;
 };
 
 //////////////
@@ -39,6 +38,7 @@ struct PixelInputType
     float2 tex : TEXCOORD0;
     float3 normal : NORMAL;
     float3 lightDir : TEXCOORD1;
+    float intensity : TEXCOORD2;
 };
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -67,6 +67,8 @@ PixelInputType SunLightVertexShader(VertexInputType input)
 
     // Use the light direction directly.
     output.lightDir = normalize(lightDirection);
+    
+    output.intensity = intensity;
 
     return output;
 }