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#ifndef _CTerrain
#define _CTerrain

#include <irrlicht.h>

using namespace irr;

//#pragma comment(lib, "Irrlicht.lib")

class CTerrain : public scene::ISceneNode
{
public:
const enum TerrainQuality {High=1,Medium=2,Low=4,ExtraLow=8};
CTerrain::CTerrain(c8* HeightmapFile,TerrainQuality Quality,f32 ScaleTexture,scene::ISceneNode* parent,scene::ISceneManager* smgr,s32 id);
CTerrain::~CTerrain();
void setColorTexture(c8* FileName);
void setDetailTexture(c8* FileName);
void SetTextureSplat(u32 NumTex,c8* FileName);
void setDebugMode(bool Enable);
void setRenderDistance(f32 Distance);
void ActivateSplattingTextures(scene::ISceneManager* smgr,f32 Height,f32 Fog,video::SColorf FogColor);
scene::IMesh* getMesh();
f32 getHeight(f32 x,f32 z);
virtual void setMaterialType(const video::E_MATERIAL_TYPE Mat);
virtual void OnRegisterSceneNode();
virtual void render();
virtual const core::aabbox3d<f32>& getBoundingBox() const;
virtual video::SMaterial& getMaterial(u32 i);
virtual void setPosition(const core::vector3df &Pos);
virtual void setScale(const core::vector3df &Scale);
u32 getMaterialCount();
private:
core::aabbox3d<f32> Box;
video::SMaterial Material;
scene::SMeshBufferLightMap** CTTileBuffer;
void calculateNormals ( scene::SMeshBufferLightMap* pMeshBuffer,s32 Size);
bool Debug;
f32 RenderDistance;
scene::SMesh* TerrainMesh;
u16 NbsTiles;
};

class MyShaderCallBack : public video::IShaderConstantSetCallBack
{
public:
scene::ISceneManager* smgr;
f32 Height,Fog;
video::SColorf FogColor;

void setSplatScene(scene::ISceneManager* scene,f32 height,f32 fog,video::SColorf fogColor)
{
smgr=scene;
Height = height;
Fog = fog;
FogColor = fogColor;
}

virtual void OnSetConstants(video::IMaterialRendererServices* services, s32 userData)
{
video::IVideoDriver* driver = services->getVideoDriver();

core::matrix4 worldViewProj;
worldViewProj = driver->getTransform(video::ETS_PROJECTION);
worldViewProj *= driver->getTransform(video::ETS_VIEW);
worldViewProj *= driver->getTransform(video::ETS_WORLD);

if (driver->getDriverType() == video::EDT_OPENGL)
{
worldViewProj = worldViewProj.getTransposed();

int var;
var = 0;
services->setPixelShaderConstant("texgrass", reinterpret_cast<f32*>(&var), 1);
var = 1;
services->setPixelShaderConstant("texrock", reinterpret_cast<f32*>(&var), 1);
var = 2;
services->setPixelShaderConstant("texsnow", reinterpret_cast<f32*>(&var), 1);
var = 3;
services->setPixelShaderConstant("texdetail", reinterpret_cast<f32*>(&var), 1);
}
services->setVertexShaderConstant("mWorldViewProj",worldViewProj.pointer(),16);

services->setVertexShaderConstant("TerrainHeight",reinterpret_cast<f32*>(&Height),1);
services->setVertexShaderConstant("FogDistance",reinterpret_cast<f32*>(&Fog),1);

core::vector3df pos = smgr->getActiveCamera()->getPosition();
services->setVertexShaderConstant("cameraPos", reinterpret_cast<f32*>(&pos), 3);

core::matrix4 world = driver->getTransform(video::ETS_WORLD);
services->setVertexShaderConstant("mWorld",world.pointer(),16);

services->setPixelShaderConstant("fog",reinterpret_cast<f32*>(&FogColor),4);
}
};

#endif

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#include <CTerrain.h>
#include <irrlicht.h>

using namespace irr;

CTerrain::CTerrain(c8* HeightmapFile,TerrainQuality Quality,f32 ScaleTexture,scene::ISceneNode* parent,scene::ISceneManager* smgr,s32 id): scene::ISceneNode(parent, smgr, id)
{
//Test if the number of quality is correct
if(Quality != 1 && Quality != 2 && Quality != 4 && Quality != 8)
{
//if not force to medium quality
Quality = Medium;
}

//Set the Debug to false
Debug=false;

//Get the Heightmap
video::IImage *Heightmap = SceneManager->getVideoDriver()->createImageFromFile(HeightmapFile);

//Get dimension of heightmap
u16 Size = Heightmap->getDimension().Width;

//Set the size of Tiles for Terrain
s32 SizeOfTiles = 0;

//Switch Size for calculate the Size of Tile
switch(Size)
{
case 64:
SizeOfTiles=(Size/4)+1;
NbsTiles = 4*4;
break;
case 128 :
SizeOfTiles=(Size/8)+1;
NbsTiles = 8*8;
break;
case 256 :
SizeOfTiles=(Size/16)+1;
NbsTiles = 16*16;
break;
case 512 :
SizeOfTiles=(Size/16)+1;
NbsTiles = 16*16;
break;
case 768 :
SizeOfTiles=(Size/24)+1;
NbsTiles = 24*24;
break;
case 1024:
SizeOfTiles=(Size/32)+1;
NbsTiles = 32*32;
break;
case 2048:
SizeOfTiles=(Size/32)+1;
NbsTiles = 32*32;
break;
default:
SizeOfTiles=(Size/16)+1;
NbsTiles = 16*16;
break;
}

//Create the Mesh for the Terrain Mesh
TerrainMesh = new scene::SMesh();

//Calculate the quality factor
u32 SOTiles = irr::core::ceil32((f32)SizeOfTiles/(f32)Quality);

//Init the array of MeshBuffer
CTTileBuffer=new scene::SMeshBufferLightMap* [NbsTiles];

//Start the loop to create Buffers
u32 TileX=0,TileZ=0;
for (u32 i =0;i < NbsTiles;++i)
{
CTTileBuffer[i]=new scene::SMeshBufferLightMap();
CTTileBuffer[i]->Vertices.set_used(SizeOfTiles*SizeOfTiles);
CTTileBuffer[i]->Indices.set_used(SizeOfTiles*SizeOfTiles*6);

const f32 tdSize = 1.0f/(f32)(Size-1);
u32 Index=0;
u16 NbsIndices=0,NbsVertices=0;

for(u32 x=TileX;x<(TileX+SizeOfTiles);x+=Quality)
{
for (u32 z=TileZ;z<(TileZ+SizeOfTiles);z+=Quality)
{
if (NbsVertices < (SOTiles*SOTiles)-SOTiles-1)
{
Index = NbsVertices;
u32 TestValue = ( (((x-TileX)/Quality)+1) * ((z-TileZ)/Quality) + ((x-TileX)/Quality) );
if (Index != TestValue || (x-TileX==0 && z < TileZ+SizeOfTiles-Quality))
{
CTTileBuffer[i]->Indices[NbsIndices++]=Index;
CTTileBuffer[i]->Indices[NbsIndices++]=Index+1;
CTTileBuffer[i]->Indices[NbsIndices++]=Index+SOTiles+1;
CTTileBuffer[i]->Indices[NbsIndices++]=Index;
CTTileBuffer[i]->Indices[NbsIndices++]=Index+SOTiles+1;
CTTileBuffer[i]->Indices[NbsIndices++]=Index+SOTiles;
}
}

video::S3DVertex2TCoords vertex;
vertex.Normal = core::vector3df(0,1,0);
vertex.Pos.X = (f32)x;
video::SColor pixelColor(Heightmap->getPixel(x,z));
vertex.Pos.Y = (f32) pixelColor.getLuminance()/10.0f;
vertex.Pos.Z = (f32)z;
vertex.TCoords = core::vector2d<f32>( (f32)(x*tdSize), (f32)(z*tdSize));
vertex.TCoords2 = core::vector2d<f32>( (f32)(x*tdSize), (f32)(z*tdSize))*ScaleTexture;

CTTileBuffer[i]->Vertices[NbsVertices]=vertex;

NbsVertices++;
}
}

CTTileBuffer[i]->Material.Lighting = true;
//CTTileBuffer[i]->Material.Wireframe = true;
CTTileBuffer[i]->Material.BackfaceCulling = true;
CTTileBuffer[i]->Material.GouraudShading=true;
CTTileBuffer[i]->Material.FogEnable=false;

CTTileBuffer[i]->Material.DiffuseColor=video::SColor(255,255,255,255);
CTTileBuffer[i]->Material.AmbientColor=video::SColor(255,255,255,255);
CTTileBuffer[i]->Material.EmissiveColor=video::SColor(255,255,255,255);

CTTileBuffer[i]->Vertices.set_used(NbsVertices);
CTTileBuffer[i]->Indices.set_used(NbsIndices);

for(s32 j = 0; j < ((Quality+1)/2); j++)
{
for(u32 index = 2; index < (SOTiles * SOTiles - 2); index++)
{
//A[i] = (1/8)*(A[i-2] + 2*A[i-1] + 2*A[i] + 2*A[i+1] + A[i+2]);
CTTileBuffer[i]->Vertices[index].Pos.Y += (1/8)*
(CTTileBuffer[i]->Vertices[index-2].Pos.Y +
2*CTTileBuffer[i]->Vertices[index-1].Pos.Y +
2*CTTileBuffer[i]->Vertices[index].Pos.Y +
2*CTTileBuffer[i]->Vertices[index+1].Pos.Y +
CTTileBuffer[i]->Vertices[index+2].Pos.Y);
}
}

for(s32 k = 0; k < ((Quality+1)/2); k++)
{
for(u32 index = SOTiles; index < (SOTiles * (SOTiles - 1)); index++)
{
CTTileBuffer[i]->Vertices[index].Pos.Y = (CTTileBuffer[i]->Vertices[index - SOTiles].Pos.Y + CTTileBuffer[i]->Vertices[index + SOTiles].Pos.Y ) / 2.0f;
}
}

//Calculate the normals
calculateNormals(CTTileBuffer[i],SOTiles);

//Recalculate the bounding box
CTTileBuffer[i]->recalculateBoundingBox();

//Add the buffer to the Terrain Mesh
TerrainMesh->addMeshBuffer(CTTileBuffer[i]);

TileX+=SizeOfTiles-1;
if(TileX >= Size)
{
TileX=0;

TileZ+=SizeOfTiles-1;
if(TileZ >= Size)
{
TileZ=0;
}
}
}
AutomaticCullingState = scene::EAC_OFF;
Heightmap->drop();
}

CTerrain::~CTerrain()
{
for(u32 i=0;i<NbsTiles;++i)
{
if (CTerrain::CTTileBuffer[i] != NULL)
{
CTerrain::CTTileBuffer[i]->drop();
}
}

delete [] CTerrain::CTTileBuffer;

if(CTerrain::TerrainMesh != NULL)
{
CTerrain::TerrainMesh->drop();
}
}

void CTerrain::OnRegisterSceneNode()
{
if (IsVisible)
SceneManager->registerNodeForRendering(this);

ISceneNode::OnRegisterSceneNode();
}

void CTerrain::render()
{
scene::ICameraSceneNode* cam = SceneManager->getActiveCamera();
const scene::SViewFrustum* frustum = cam->getViewFrustum();
video::IVideoDriver* Driver = SceneManager->getVideoDriver();
core::vector3df Pos = cam->getPosition();
cam->updateAbsolutePosition();

Pos.Y=0.0f;

for (u32 i=0;i<NbsTiles;i++)
{
if (CTTileBuffer[i] != NULL)
{
Driver->setTransform(video::ETS_WORLD,AbsoluteTransformation);

//DEBUG HERE
if(Debug==true)
{
video::SMaterial Mat;
Mat.AmbientColor = video::SColor(255,255,255,255);
Mat.DiffuseColor = video::SColor(255,255,255,255);
Mat.EmissiveColor = video::SColor(255,0,255,0);
Driver->setMaterial(Mat);
Driver->draw3DBox(CTTileBuffer[i]->getBoundingBox(),video::SColor(255,255,255,255));
}

if( frustum->getBoundingBox().intersectsWithBox(CTTileBuffer[i]->getBoundingBox())==true)
{
f64 ActualDistance = CTTileBuffer[i]->BoundingBox.getCenter().getDistanceFrom(Pos);
if(ActualDistance < RenderDistance)
{
Driver->setMaterial(video::SMaterial(CTTileBuffer[i]->Material));
Driver->drawIndexedTriangleList(&CTTileBuffer[i]->Vertices[0],CTTileBuffer[i]->getVertexCount(),&CTTileBuffer[i]->Indices[0], CTTileBuffer[i]->getIndexCount()/3 );
//Driver->drawMeshBuffer(CTTileBuffer[i]);
}
}
}
}
}

void CTerrain::setPosition(const core::vector3df &Pos)
{
for (u32 i=0;i<NbsTiles;i++)
{
if (CTTileBuffer[i] != NULL)
{
for (u32 j=0;j<CTTileBuffer[i]->getVertexCount();++j)
{
CTTileBuffer[i]->Vertices[j].Pos+=Pos;
}
CTTileBuffer[i]->recalculateBoundingBox();
}
}
}

void CTerrain::setScale(const core::vector3df &Scale)
{
for (u32 i=0;i<NbsTiles;i++)
{
if (CTTileBuffer[i] != NULL)
{
for (u32 j=0;j<CTTileBuffer[i]->getVertexCount();++j)
{
CTTileBuffer[i]->Vertices[j].Pos*=Scale;
}
CTTileBuffer[i]->recalculateBoundingBox();
}
}
}

const core::aabbox3d<f32>& CTerrain::getBoundingBox() const
{
return Box;
}

u32 CTerrain::getMaterialCount()
{
return 1;
}

video::SMaterial& CTerrain::getMaterial(u32 i)
{
return Material;
}

void CTerrain::ActivateSplattingTextures(scene::ISceneManager* smgr,f32 Height,f32 Fog,video::SColorf FogColor)
{
video::IVideoDriver* driver = smgr->getVideoDriver();
s32 newMaterialType1 = 0;
video::IGPUProgrammingServices* gpu = smgr->getVideoDriver()->getGPUProgrammingServices();

if (driver->getDriverType() != video::EDT_OPENGL)
{
//Merci à DeusXL pour son shader

c8 ShaderFileName[] =
"texgrass"
"texrock"
"texsnow"
"texdetail"
"mWorldViewProj"

"TerrainHeight"
"FogDistance"
"cameraPos"
"mWorld"
"fog"
"float4x4 mWorldViewProj;n"

"float4x4 mWorld;n"
"float3 cameraPos;n"
"float TerrainHeight;n"
"float FogDistance;n"
"struct VS_OUTPUTn"
"{n"
"float4 Position : POSITION;n"
"float4 Diffuse : COLOR0;n"
"float2 TexCoord1 : TEXCOORD1;n"
"};n"
"VS_OUTPUT vertexMain( in float4 vPosition : POSITION,in float3 vNormal : NORMAL,float2 texCoord1 : TEXCOORD1)n"
"{n"

"VS_OUTPUT Output;n"
"Output.Position = mul(vPosition, mWorldViewProj);n"
"float4 position = mul(vPosition, mWorld);n"
"float dist = sqrt ( pow(position.x - cameraPos.x, 2.0f) +n"

"pow(position.y - cameraPos.y, 2.0f) +n"
"pow(position.z - cameraPos.z, 2.0f));n"
"Output.Diffuse = float4(vPosition.y / TerrainHeight, dist / FogDistance, 0.0f, 0.0f);n"
"Output.TexCoord1 = texCoord1;n"
"return Output;n"
"}n"
"struct PS_OUTPUTn"

"{n"
"float4 RGBColor : COLOR0;n"
"};n"
"sampler2D tex[4];n"
"float4 fog;n"

"PS_OUTPUT pixelMain( float2 TexCoord1 : TEXCOORD1,float4 Position : POSITION,float4 Diffuse : COLOR0 )n"
"{n"
"PS_OUTPUT Output;n"
"float heightpercent = Diffuse.x;n"
"float dist = Diffuse.y;n"

"float4 grasscolor = tex2D(tex[0], TexCoord1 * 5.0f) * pow((1.0f - heightpercent), 4.0f);n"
"float4 rockcolor = tex2D(tex[1], TexCoord1 * 5.0f) * pow((1.0f - abs(0.5f - heightpercent)), 4.0f);n";

if (gpu)
{
MyShaderCallBack* mc = new MyShaderCallBack();
mc->setSplatScene(smgr,Height,Fog,FogColor);
newMaterialType1 = gpu->addHighLevelShaderMaterial(
ShaderFileName, "float4 snowcolor = tex2D(tex[2], TexCoord1 * 5.0f) * pow(heightpercent,4.0f);n", video::EVST_VS_2_0,
ShaderFileName, "float4 detailcolor = tex2D(tex[3], TexCoord1 * 5.0f) * pow((1.0f - abs(0.7f - heightpercent)), 4.0f);n", video::EPST_PS_2_0,
mc, video::EMT_SOLID,0);
mc->drop();
}
}
else
{
c8 ShaderFragment[] =
"Output.RGBColor = (grasscolor + rockcolor + snowcolor + detailcolor);n"//n"
"if (dist >= 0.5f)n"struct VS_OUTPUT {n"{n"vec4 Position;n"Output.RGBColor *= (1.0f - (dist-0.5f));n"vec4 Diffuse;n"Output.RGBColor += (fog * (dist-0.5f));n"vec2 TexCoord1;n"}n"};n"return Output;n"struct PS_OUTPUT {n"}n"vec4 RGBColor;n"vertexMain"};n"pixelMain"// Structure definitionsn"
"//n"
"//n"

"// Global variable definitionsn"
"
"
"

"
"//n"
"
"PS_OUTPUT pixelMain( in vec2 TexCoord1, in vec4 Position, in vec4 Diffuse );n"
"//n"
"

"// Function declarationsn"
"
"
"
"
"

"
"//n"
"
"uniform vec4 fog;n"
"uniform sampler2D texgrass,texrock,texsnow,texdetail;n"
"//n"
"
"// Function definitionsn"
"

"
"
"//n"
"
"PS_OUTPUT pixelMain( in vec2 TexCoord1, in vec4 Position, in vec4 Diffuse ) {n"
"float heightpercent;n"
"float dist;n"
"vec4 grasscolor;n"
"vec4 rockcolor;n"
"vec4 snowcolor;n"
"vec4 detailcolor;n"
"PS_OUTPUT Output;n"
"heightpercent = Diffuse.x ;n"
"dist = Diffuse.y ;n"
"grasscolor = (texture2D( texgrass, (TexCoord1 * 5.00000)) * pow( (1.00000 - heightpercent), 4.00000));n"

"rockcolor = (texture2D( texrock, (TexCoord1 * 5.00000)) * pow( (1.00000 - abs( (0.500000 - heightpercent) )), 4.00000));n"//n"
"snowcolor = (texture2D( texsnow, (TexCoord1 * 5.00000)) * pow( heightpercent, 4.00000));n"void main() {n"detailcolor = (texture2D( texdetail, (TexCoord1 * 5.00000)) * pow( (1.00000 - abs( (0.700000 - heightpercent) )), 4.00000));n"PS_OUTPUT xlat_retVal;n"Output.RGBColor = (((grasscolor + rockcolor) + snowcolor) + detailcolor);n"xlat_retVal = pixelMain( vec2(gl_TexCoord[1]), vec4(gl_FragCoord), vec4(gl_Color));n"if ( (dist >= 0.500000) ){n"gl_FragData[0] = vec4( xlat_retVal.RGBColor);n"Output.RGBColor *= (1.00000 - (dist - 0.500000));n"}n"Output.RGBColor += (fog * (dist - 0.500000));n"// Translator's entry pointn"
"}n"//n"

"return Output;n"
"}n"
"//n"
"
"// Structure definitionsn"
"
"
"

"
"
"
"
"
"

";

c8 ShaderVertex[]=
"//n"
"//n"
"uniform float FogDistance;n"struct VS_OUTPUT {n"uniform float TerrainHeight;n"vec4 Position;n"uniform vec3 cameraPos;n"vec4 Diffuse;n"uniform mat4 mWorld;n"vec2 TexCoord1;n"uniform mat4 mWorldViewProj;n"};n"// Global variable definitionsn"
"struct PS_OUTPUT {n"//n"

"vec4 RGBColor;n"

"};n"//n"
"// Function declarationsn"
"VS_OUTPUT vertexMain( in vec4 vPosition, in vec3 vNormal, in vec2 texCoord1 ) {n"//n"

"VS_OUTPUT Output;n"
"vec4 position;n"
"float dist;n"
"Output.Position = ( vPosition * mWorldViewProj );n"
"position = ( vPosition * mWorld );n"

"dist = sqrt( ((pow( (position.x - cameraPos.x ), 2.00000) + pow( (position.y - cameraPos.y ), 2.00000)) + pow( (position.z - cameraPos.z ), 2.00000)) );n"//n"
"Output.Diffuse = vec4( (vPosition.y / TerrainHeight), (dist / FogDistance), 0.000000, 0.000000);n"VS_OUTPUT vertexMain( in vec4 vPosition, in vec3 vNormal, in vec2 texCoord1 );n"Output.TexCoord1 = texCoord1;n"// Function definitionsn"
"return Output;n"//n"

"}n"
"//n"
"
"// Translator's entry pointn"
"
"
"

"

"
"

"
"
"
"
"
"
"
";

if (gpu)
{
MyShaderCallBack* mc = new MyShaderCallBack();
mc->setSplatScene(smgr,Height,Fog,FogColor);
newMaterialType1 = gpu->addHighLevelShaderMaterial(
ShaderVertex, "
", video::EVST_VS_1_1,
ShaderFragment, "

", video::EPST_PS_1_1,
mc, video::EMT_SOLID,0);
mc->drop();
}
}
setMaterialType((video::E_MATERIAL_TYPE)newMaterialType1);
}

void CTerrain::setColorTexture(c8* FileName)
{
for (u32 i=0;i<NbsTiles;++i)
{
if (CTTileBuffer[i] != NULL)
{
CTTileBuffer[i]->Material.MaterialType = video::EMT_SOLID;
CTTileBuffer[i]->Material.Textures[0] = SceneManager->getVideoDriver()->getTexture(FileName);
}
}
}

void CTerrain::setDetailTexture(c8* FileName)
{
for (u32 i=0;i<NbsTiles;++i)
{
if (CTTileBuffer[i] != NULL)
{
CTTileBuffer[i]->Material.MaterialType = video::EMT_DETAIL_MAP;
CTTileBuffer[i]->Material.Textures[1] = SceneManager->getVideoDriver()->getTexture(FileName);
}
}
}

void CTerrain::SetTextureSplat(u32 NumTex,c8* FileName)
{
for (u32 i=0;i<NbsTiles;++i)
{
if (CTTileBuffer[i] != NULL)
{
CTTileBuffer[i]->Material.Textures[NumTex] = SceneManager->getVideoDriver()->getTexture(FileName);
}
}
}

void CTerrain::setDebugMode(bool Enable)
{
Debug=Enable;
}

void CTerrain::setRenderDistance(f32 Distance)
{
RenderDistance = Distance;
}

void CTerrain::setMaterialType(video::E_MATERIAL_TYPE Mat)
{
for (u32 i=0;i < NbsTiles;++i)
{
if (CTTileBuffer[i] != NULL)
{
CTTileBuffer[i]->Material.MaterialType = Mat;
}
}
}

scene::IMesh* CTerrain::getMesh()
{
return (scene::IMesh*)TerrainMesh;
}

f32 CTerrain::getHeight(f32 x,f32 z)
{
scene::SMeshBufferLightMap* TempBuffer=NULL;

f32 ValueReturn = 0.0f;

for (u32 i=0;i < NbsTiles;++i)
{
if (CTTileBuffer[i] != NULL)
{
core::vector3df Vec(x,CTTileBuffer[i]->getBoundingBox().getCenter().Y,z);
if(CTTileBuffer[i]->getBoundingBox().isPointInside(Vec))
{
TempBuffer=CTTileBuffer[i];
break;
}
}
}

if(TempBuffer != NULL)
{
//n"
scene::SMesh* Mesh=new scene::SMesh();
Mesh->addMeshBuffer(TempBuffer);
scene::ITriangleSelector* selector= SceneManager->createTriangleSelector((scene::IMesh*)Mesh,this);
this->setTriangleSelector(selector);

core::line3d<f32> line;
line.start = core::vector3d<f32>(x,-200000,z);
line.end = core::vector3d<f32>(x,200000,z);

core::vector3df intersection;
core::triangle3df tri;

if (SceneManager->getSceneCollisionManager()->getCollisionPoint(line, selector, intersection,tri))
{
ValueReturn = intersection.Y;
}
selector->drop();
Mesh->drop();
}
else
{
ValueReturn=-999999.999f;
}

return ValueReturn;
}

//Si le TempBuffer renvoi différent de null, on se situ dans un tile
void CTerrain::calculateNormals ( scene::SMeshBufferLightMap* pMeshBuffer,s32 Size)
{
s32 count;
//Take from the irrlicht source code
core::vector3df a, b, c, t;

for (s32 x=0; x<Size; ++x)
for (s32 z=0; z<Size; ++z)
{
count = 0;
core::vector3df normal;

//s32 Size = 4;
if (x>0 && z>0)
{
a = pMeshBuffer->Vertices[(x-1)*Size+z-1].Pos;
b = pMeshBuffer->Vertices[(x-1)*Size+z].Pos;
c = pMeshBuffer->Vertices[x*Size+z].Pos;
b -= a;
c -= a;
t = b.crossProduct ( c );
t.normalize ( );
normal += t;

a = pMeshBuffer->Vertices[(x-1)*Size+z-1].Pos;
b = pMeshBuffer->Vertices[x*Size+z-1].Pos;
c = pMeshBuffer->Vertices[x*Size+z].Pos;
b -= a;
c -= a;
t = b.crossProduct ( c );
t.normalize ( );
normal += t;

count += 2;
}

// top left
if (x>0 && z<Size-1)
{
a = pMeshBuffer->Vertices[(x-1)*Size+z].Pos;
b = pMeshBuffer->Vertices[(x-1)*Size+z+1].Pos;
c = pMeshBuffer->Vertices[x*Size+z+1].Pos;
b -= a;
c -= a;
t = b.crossProduct ( c );
t.normalize ( );
normal += t;

a = pMeshBuffer->Vertices[(x-1)*Size+z].Pos;
b = pMeshBuffer->Vertices[x*Size+z+1].Pos;
c = pMeshBuffer->Vertices[x*Size+z].Pos;
b -= a;
c -= a;
t = b.crossProduct ( c );
t.normalize ( );
normal += t;

count += 2;
}

// top right
if (x<Size-1 && z<Size-1)
{
a = pMeshBuffer->Vertices[x*Size+z+1].Pos;
b = pMeshBuffer->Vertices[x*Size+z+1].Pos;
c = pMeshBuffer->Vertices[(x+1)*Size+z+1].Pos;
b -= a;
c -= a;
t = b.crossProduct ( c );
t.normalize ( );
normal += t;

a = pMeshBuffer->Vertices[x*Size+z+1].Pos;
b = pMeshBuffer->Vertices[(x+1)*Size+z+1].Pos;
c = pMeshBuffer->Vertices[(x+1)*Size+z].Pos;
b -= a;
c -= a;
t = b.crossProduct ( c );
t.normalize ( );
normal += t;

count += 2;
}

// bottom right
if (x<Size-1 && z>0)
{
a = pMeshBuffer->Vertices[x*Size+z-1].Pos;
b = pMeshBuffer->Vertices[x*Size+z].Pos;
c = pMeshBuffer->Vertices[(x+1)*Size+z].Pos;
b -= a;
c -= a;
t = b.crossProduct ( c );
t.normalize ( );
normal += t;

a = pMeshBuffer->Vertices[x*Size+z-1].Pos;
b = pMeshBuffer->Vertices[(x+1)*Size+z].Pos;
c = pMeshBuffer->Vertices[(x+1)*Size+z-1].Pos;
b -= a;
c -= a;
t = b.crossProduct ( c );
t.normalize ( );
normal += t;

count += 2;
}

if ( count != 0 )
{
normal.normalize ( );
}
else
{
normal.set( 0.0f, 1.0f, 0.0f );
}

pMeshBuffer->Vertices[x * Size + z].Normal = normal;
}
}

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#include <CTerrain.h>

CTerrain* Terrain=new CTerrain("texgrass",CTerrain::Medium,10,smgr->getRootSceneNode(),smgr,0);
Terrain->setScale(core::vector3df(30,50,30));
//La distance de rendu, plus elle sera élevée plus ça va ramer....
Terrain->setRenderDistance(5000.0f);
//Terrain->setDebugMode(true); //ici ça ralenti le bazard mais ça peut être utile
Terrain->setPosition(core::vector3df(-3840,0,-3840));

//Simili texture splatting on est pas obligé de l'utiliser, voir plus bas

Terrain->ActivateSplattingTextures(smgr,600.0f,3000.0f,video::SColorf(0.0f,0.5f,0.8f,1.0f));
Terrain->SetTextureSplat(0,"texrock");
Terrain->SetTextureSplat(1,"texsnow");
Terrain->SetTextureSplat(2,"texdetail");
Terrain->SetTextureSplat(3,"mWorldViewProj");

//Texturage normal Voilà, ici on peut utiliser ça mais perso j'aime pas

//Terrain->setColorTexture("Media/Colormap.jpg");
//Terrain->setDetailTexture("Media/Detail.jpg");