Time for action – adding the BuildVertexBuffer() method

1. 1. Add the Vertex Buffer region to the Terrain class as follows:

   #region Vertex Buffer
   private void BuildVertexBuffer(
       int width, 
       int height, 
       float heightScale)
   {
       VertexPositionNormalTexture[] vertices = 
           new VertexPositionNormalTexture [width*height];
               
       for (int x=0; x<width; x++)
           for (int z=0; z<height; z++)
           {
             vertices[x + (z*width)].Position = 
               new Vector3(x, heights[x,z], z);
           }
   
       vertexBuffer = new VertexBuffer(
           device, 
           typeof(VertexPositionNormalTexture), 
           vertices.Length, 
           BufferUsage.WriteOnly);
   
       vertexBuffer.SetData(vertices);
   }
   #endregion

What just happened?

After creating an empty array of VertexPositionNormalTexture objects, we loop through the width and height of our terrain, creating a new VertexPositionNormalTexture for each vertex. The X and Z coordinates of the vertex are directly equal...