#ifndef _TERRAIN_H_
#define _TERRAIN_H_#include <Ogre.h>
#include "Common.h"using namespace Ogre;#define VERTEX_POS_BINDING 0class CTerrain :public SimpleRenderable
{
public://numVertsPerCol,numVertsPerRow为奇数时m_width，m_depth必定为偶数CTerrain(int numVertsPerRow=513,int numVertsPerCol=513,int cellSize=10,float heightScal=1.0f);~CTerrain();public:bool InitData();void LoadHeightmap();void CreateVertexData();void CreateIndexData();// Overridden from MovableObjectvirtual Real getBoundingRadius() const;virtual const AxisAlignedBox& getBoundingBox() const;// Overridden from Renderablevirtual Real getSquaredViewDepth(const Ogre::Camera* cam) const;
private:String m_heightMapPath;//高度图float *m_heightMap;//高度数据float m_heightScal;//高度缩放值int m_numVertsPerRow;//每行顶点数int m_numVertsPerCol;//每列顶点数int m_numCellsPerRow;//每行格子数int m_numCellsPerCol;//每列格子数int m_cellSize;//格子边长int m_numVerts;//顶点总数int m_numTriangles;//三角形总数int m_width;//地形宽度int m_depth;//地形深度bool m_bSaveData;//是否保存顶点信息
AxisAlignedBox mAABB;Real mBoundingRadius;VertexData *pVertexData;IndexData *pIndexData;
};#endif

#include "Terrain.h"
#include <fstream>CTerrain::CTerrain(int numVertsPerRow,int numVertsPerCol,int cellSize,float heightScal)
{m_numVertsPerRow=numVertsPerRow;m_numVertsPerCol=numVertsPerCol;m_heightScal=heightScal;m_cellSize=cellSize;m_heightMapPath="";m_bSaveData=true;m_numCellsPerRow=m_numVertsPerRow-1;m_numCellsPerCol=m_numVertsPerCol-1;m_numVerts=m_numVertsPerRow*m_numVertsPerCol;m_numTriangles=m_numCellsPerRow*m_numCellsPerCol*2;m_width=m_numCellsPerRow*m_cellSize;m_depth=m_numCellsPerCol*m_cellSize;m_heightMap=new float[m_numVerts];
}CTerrain::~CTerrain()
{safeDelArry(m_heightMap);OGRE_DELETE(mRenderOp.vertexData);OGRE_DELETE(mRenderOp.indexData);
}bool CTerrain::InitData()
{LoadHeightmap();CreateVertexData();CreateIndexData();return true;
}void CTerrain::LoadHeightmap()
{for (int i=0;i<m_numVerts;i++){m_heightMap[i]=1.0f;}
}void CTerrain::CreateVertexData()
{mRenderOp.vertexData=new VertexData();pVertexData=mRenderOp.vertexData;pVertexData->vertexCount=m_numVerts;pVertexData->vertexStart=0;mRenderOp.operationType=RenderOperation::OT_TRIANGLE_LIST;mRenderOp.useIndexes=true;VertexDeclaration *decl=pVertexData->vertexDeclaration;VertexBufferBinding *bind=pVertexData->vertexBufferBinding;size_t vOffset=0,textCoordSet=0;decl->addElement(0,vOffset,VET_FLOAT3,VES_POSITION);vOffset=vOffset+VertexElement::getTypeSize(VET_FLOAT3);decl->addElement(0,vOffset,VET_COLOUR,VES_DIFFUSE);vOffset += Ogre::VertexElement::getTypeSize(Ogre::VET_COLOUR);decl->addElement(0,vOffset,VET_FLOAT2,VES_TEXTURE_COORDINATES,textCoordSet++);vOffset=vOffset+VertexElement::getTypeSize(VET_FLOAT2);decl->addElement(0,vOffset,VET_FLOAT2,VES_TEXTURE_COORDINATES,textCoordSet++);HardwareVertexBufferSharedPtr pVerBuff;pVerBuff=HardwareBufferManager::getSingleton().createVertexBuffer(decl->getVertexSize(0),m_numVerts,HardwareBuffer::HBU_STATIC_WRITE_ONLY,false);float *pLock=static_cast<float *>(pVerBuff->lock(0,pVerBuff->getSizeInBytes(),HardwareBuffer::HBL_DISCARD));RGBA colour,*pColour;RenderSystem *rs=Ogre::Root::getSingleton().getRenderSystem();rs->convertColourValue(ColourValue(1.0f,1.0f,1.0f),&colour);float start_x,end_x,start_z,end_z;int index=0;start_x=-m_width/2;end_x=-start_x;start_z=-m_depth/2;end_z=-start_z;std::ofstream of;bool bopen=false;if (m_bSaveData){of.open(L"vertexInfo.txt",std::ios::out|std::ios::trunc);if (of.is_open()){bopen=true;of<<"------------------------------------------\r\n";of<<"vertex data info:\r\n";}else{MessageBox( NULL, L"INFO",L"An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);}}float y=0.0f,tu=0.0f,tv=0.0f;int h=0,c=0;char tmepChar[128]={0};for (float z=start_z;z<=end_z;z+=m_cellSize){tu=h*m_cellSize/(float)m_width;h++;c=0;for (float x=start_x;x<=end_x;x+=m_cellSize){tv=c*m_cellSize/(float)m_depth;c++;y=m_heightMap[index++];*pLock=x;pLock++;*pLock=y;pLock++;*pLock=z;pLock++;pColour=static_cast<RGBA *>(static_cast<void *>(pLock));*pColour=colour;pColour++;pLock=static_cast<float *>(static_cast<void *>(pColour));*pLock=tu;pLock++;*pLock=tv;pLock++;*pLock=tu;pLock++;*pLock=tv;pLock++;if (m_bSaveData&&bopen){sprintf(tmepChar,"x=%f y=%f z=%f u=%f v=%f\r\n",x,y,z,tu,tv);of<<tmepChar;}}}pVerBuff->unlock();bind->setBinding(0,pVerBuff);if (m_bSaveData&&bopen)of.close();float boxHeght=20.0f;float vertices[8][3] = {start_x, boxHeght, start_z,        // A-start_x, boxHeght, start_z,    // Bstart_x, boxHeght, -start_z,    // C-start_x, boxHeght, -start_z,    // D
start_x, boxHeght, start_z,        // A-start_x, boxHeght, start_z,    // Bstart_x, boxHeght, -start_z,    // C-start_x, boxHeght, -start_z,    // D
    };for (int i=0;i<8;i++){mAABB.merge(Ogre::Vector3(vertices[i][0], vertices[i][1], vertices[i][2]));        }mBoundingRadius = Ogre::Math::boundingRadiusFromAABB(mAABB);}
/*A---------B-            --            --            -C-----------D
*/
void CTerrain::CreateIndexData()
{mRenderOp.indexData=new IndexData();pIndexData=mRenderOp.indexData;pIndexData->indexStart=0;pIndexData->indexCount=m_numTriangles*3;pIndexData->indexBuffer=HardwareBufferManager::getSingleton().createIndexBuffer(HardwareIndexBuffer::IT_16BIT,pIndexData->indexCount,HardwareBuffer::HBU_STATIC_WRITE_ONLY);unsigned short *pIndexLock=static_cast<unsigned short *>(pIndexData->indexBuffer->lock(0, pIndexData->indexBuffer->getSizeInBytes(),HardwareBuffer::HBL_DISCARD));std::ofstream of;bool bopen=false;if (m_bSaveData){of.open(L"indexInfo.txt",std::ios::out|std::ios::trunc);if (of.is_open()){bopen=true;of<<"------------------------------------------\r\n";of<<"index data info:\r\n";}else{MessageBox( NULL, L"INFO",L"An exception has occured!", MB_OK | MB_ICONERROR | MB_TASKMODAL);}}char tmepChar[128]={0};unsigned short uvalue[6];int index=0;for (unsigned short row=0;row<m_numCellsPerCol;row++){for (unsigned short col=0;col<m_numCellsPerRow;col++){//ACBuvalue[0]=row*m_numVertsPerRow+col;*pIndexLock=uvalue[0];pIndexLock++;uvalue[1]=(row+1)*m_numVertsPerRow+col;*pIndexLock=uvalue[1];pIndexLock++;uvalue[2]=row*m_numVertsPerRow+col+1;//
            *pIndexLock=uvalue[2];pIndexLock++;//CDBuvalue[3]=uvalue[1];uvalue[5]=uvalue[2];uvalue[4]=(row+1)*m_numVertsPerRow+col+1;*pIndexLock=uvalue[3];pIndexLock++;*pIndexLock=uvalue[4];pIndexLock++;*pIndexLock=uvalue[5];pIndexLock++;if (m_bSaveData&&bopen){for (int j=0;j<6;j++){sprintf(tmepChar,"index%d=%u ",index++,uvalue[j]);of<<tmepChar;if (j==5){of<<std::endl;}}}}}pIndexData->indexBuffer->unlock();if (m_bSaveData&&bopen){of.close();}
}Real CTerrain::getBoundingRadius() const
{return mBoundingRadius;
}Real CTerrain::getSquaredViewDepth(const Ogre::Camera* cam) const
{assert(mParentNode);return mParentNode->getSquaredViewDepth(cam);
}const AxisAlignedBox& CTerrain::getBoundingBox() const
{return mAABB;
}

void CApplication::CreateTerrain()
{pTerrain=new CTerrain(65,65,10,1.0f);pTerrain->InitData();pTerrain->setMaterial("Examples/Terrain_Material");SceneNode *node =pSceneManager->getRootSceneNode()->createChildSceneNode("TerrainNode",Vector3(0,0,0));node->attachObject(pTerrain);node->showBoundingBox(true);
}

material Examples/Terrain_Material : Examples/OgreDance
{technique{pass{lighting off//scene_blend alpha_blend//cull_hardware none//cull_software none
texture_unit{texture dirt_grayrocky_diffusespecular.ddstex_address_mode wrap}texture_unit{//colour_op_ex add src_texture src_current//colour_op_multipass_fallback one one
texture grass_green-01_diffusespecular.ddstex_address_mode wrap}}}
}