better, but position doesn't matter

hw3d/PhongPS.hlsl

@@ -4,12 +4,12 @@ cbuffer LightCBuf
 };
 
 static const float3 materialColor = { 0.7f,0.7f,0.9f };
-static const float3 ambient = { 0.15f,0.15f,0.15f };
+static const float3 ambient = { 0.05f,0.05f,0.05f };
 static const float3 diffuseColor = { 1.0f,1.0f,1.0f };
 static const float diffuseIntensity = 1.0f;
 static const float attConst = 1.0f;
-static const float attLin = 1.0f;
-static const float attQuad = 1.0f;
+static const float attLin = 0.045f;
+static const float attQuad = 0.0075f;
 
 float4 main( float3 worldPos : Position,float3 n : Normal ) : SV_Target
 {
@@ -18,7 +18,7 @@ float4 main( float3 worldPos : Position,float3 n : Normal ) : SV_Target
 	const float distToL = length( vToL );
 	const float3 dirToL = vToL / distToL;
 	// diffuse attenuation
-	const float att = attConst + attLin * distToL + attQuad * (distToL * distToL);
+	const float att = 1.0f / (attConst + attLin * distToL + attQuad * (distToL * distToL));
 	// diffuse intensity
 	const float3 diffuse = diffuseColor * diffuseIntensity * att * max( 0.0f,dot( dirToL,n ) );
 	// final color