Post publish fixes

Author: SimonDarksideJ

Diff for: articles/getting_to_know/howto/graphics/files/basiceffectlighting.cs

@@ -0,0 +1,31 @@
+basicEffect.LightingEnabled = true;
+if (basicEffect.LightingEnabled)
+{
+    basicEffect.DirectionalLight0.Enabled = true; // enable each light individually
+    if (basicEffect.DirectionalLight0.Enabled)
+    {
+        // x direction
+        basicEffect.DirectionalLight0.DiffuseColor = new Vector3(1, 0, 0); // range is 0 to 1
+        basicEffect.DirectionalLight0.Direction = Vector3.Normalize(new Vector3(-1, 0, 0));
+        // points from the light to the origin of the scene
+        basicEffect.DirectionalLight0.SpecularColor = Vector3.One;
+    }
+
+    basicEffect.DirectionalLight1.Enabled = true;
+    if (basicEffect.DirectionalLight1.Enabled)
+    {
+        // y direction
+        basicEffect.DirectionalLight1.DiffuseColor = new Vector3(0, 0.75f, 0);
+        basicEffect.DirectionalLight1.Direction = Vector3.Normalize(new Vector3(0, -1, 0));
+        basicEffect.DirectionalLight1.SpecularColor = Vector3.One;
+    }
+
+    basicEffect.DirectionalLight2.Enabled = true;
+    if (basicEffect.DirectionalLight2.Enabled)
+    {
+        // z direction
+        basicEffect.DirectionalLight2.DiffuseColor = new Vector3(0, 0, 0.5f);
+        basicEffect.DirectionalLight2.Direction = Vector3.Normalize(new Vector3(0, 0, -1));
+        basicEffect.DirectionalLight2.SpecularColor = Vector3.One;
+    }
+}

Diff for: articles/getting_to_know/howto/graphics/index.md

@@ -129,14 +129,14 @@ This section walks through several core concepts related 3D rendering and math p
 
 ### 3D Collisions
 
-[Bounding Volumes and Collisions](../HowTo_CollisionDetectionOverview.md)
+- [Bounding Volumes and Collisions](../HowTo_CollisionDetectionOverview.md)
 
-Collision detection determines whether objects in a game world overlap each other.
+  Collision detection determines whether objects in a game world overlap each other.
 
-[Selecting an Object with a Mouse](HowTo_Select_an_Object_with_a_Mouse.md)
+- [Selecting an Object with a Mouse](HowTo_Select_an_Object_with_a_Mouse.md)
 
-Demonstrates how to check whether the mouse is positioned over a 3D object by creating a ray starting at the camera's near clipping plane and ending at its far clipping plane.
+  Demonstrates how to check whether the mouse is positioned over a 3D object by creating a ray starting at the camera's near clipping plane and ending at its far clipping plane.
 
-[Testing for Collisions](HowTo_Test_for_Collisions.md)
+- [Testing for Collisions](HowTo_Test_for_Collisions.md)
 
-Demonstrates how to use the BoundingSphere class to check whether two models are colliding.
+  Demonstrates how to use the BoundingSphere class to check whether two models are colliding.