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//terrainmap.h#include <d3dx9.h>//forward declarationclass HeightMap;struct Vertex{	D3DXVECTOR3 pos,n;};struct Triangle{	Vertex* p0,p1,p2;	D3DXVECTOR3 n;};struct Cell{	Triangle t0,t1;};class TerrainMap{public:		TerrainMap(unsigned int numVerticesWide, unsigned int numVerticesTall);...}//terrainmap.cpp#include "TerrainMap.h"#include "HeightMap.h"TerrainMap::TerrainMap(unsigned int numVerticesWide, unsigned int numVerticesTall){	m_numVerticesWide = numVerticesWide;	m_numVerticesTall = numVerticesTall;	m_vertices = new (Vertex*)[m_numVerticesTall];...}