RTS Terrain : Offset vs Blocks

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private VertexBuffer CreateVetrexBuffer(int size, float[,] heightData)
{
	VertexPositionColor[] vertices = new VertexPositionColor[size * size];
 
	for (int x = 0; x < size; x++)
	{
		for (int y = 0; y < size; y++)
		{
			vertices[x * size + y].Position = new Vector3(x, heightData[x, y], y);
			vertices[x * size + y].Color = Color.White;
		}
	}
 
	VertexBuffer vBuffer = new VertexBuffer(this.GraphicsDevice,
		typeof(VertexPositionColor), vertices.Length, BufferUsage.None);
	vBuffer.SetData<VertexPositionColor>(vertices);
 
	return vBuffer;
}

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private IndexBuffer CreateIndexBuffer(int size, int viewSize)
{
	int counter = 0;
	int[] indices = new int[(viewSize - 1) * (viewSize - 1) * 6];
 
	for (int y = 0; y < viewSize - 1; y++)
	{
		for (int x = 0; x < viewSize - 1; x++)
		{
			indices[counter++] = x + (y + 1) * size;
			indices[counter++] = (x + 1) + y * size;
			indices[counter++] = x + y * size;
 
			indices[counter++] = x + (y + 1) * size;
			indices[counter++] = (x + 1) + (y + 1) * size;
			indices[counter++] = (x + 1) + y * size;
		}
	}
 
	IndexBuffer iBuffer = new IndexBuffer(this.GraphicsDevice, typeof(int), indices.Length, 
BufferUsage.None);
 
	iBuffer.SetData<int>(indices);
 
	return iBuffer;
}

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private void DrawTerrain(int x, int y, int size, int viewSize)
{
	int index = x + y * size;
	int length = size * viewSize;
 
	m_effect.Begin();
 
	foreach (EffectPass pass in m_effect.CurrentTechnique.Passes)
	{
		pass.Begin();
 
		this.GraphicsDevice.Indices = m_indices;
		this.GraphicsDevice.Vertices[0].SetSource(m_vertices, 0, m_stride);
		this.GraphicsDevice.VertexDeclaration = m_vDeclaration;
 
		this.GraphicsDevice.DrawIndexedPrimitives(PrimitiveType.TriangleList, 
			index, 0, length, 0, m_facesCount);
 
		pass.End();
	}
 
	m_effect.End();
}