ogre代码学习——地形 手工和cfg创建
1. 配置文件创建地形 Terrain.cfg
# The main world texture (if you wish the terrain manager to create a material for you)
WorldTexture=terrain_texture.jpg
# The detail texture (if you wish the terrain manager to create a material for you)
DetailTexture=terrain_detail.jpg
#number of times the detail texture will tile in a terrain tile
DetailTile=3
# Heightmap source
PageSource=Heightmap
# Heightmap-source specific settings
Heightmap.image=terrain.png
# If you use RAW, fill in the below too
# RAW-specific setting - size (horizontal/vertical)
#Heightmap.raw.size=513
# RAW-specific setting - bytes per pixel (1 = 8bit, 2=16bit)
#Heightmap.raw.bpp=2
# How large is a page of tiles (in vertices)? Must be (2^n)+1
PageSize=513
# How large is each tile? Must be (2^n)+1 and be smaller than PageSize
TileSize=65
# The maximum error allowed when determining which LOD to use
MaxPixelError=3
# The size of a terrain page, in world units
PageWorldX=1500
PageWorldZ=1500
# Maximum height of the terrain
MaxHeight=100
# Upper LOD limit
MaxMipMapLevel=5
#VertexNormals=yes
100
#VertexColors=yes
#UseTriStrips=yes
# Use vertex program to morph LODs, if available
VertexProgramMorph=yes
# The proportional distance range at which the LOD morph starts to take effect
# This is as a proportion of the distance between the current LODs effective range,
# and the effective range of the next lower LOD
LODMorphStart=0.2
# This following section is for if you want to provide your own terrain shading routine
# Note that since you define your textures within the material this makes the
# WorldTexture and DetailTexture settings redundant
# The name of the vertex program parameter you wish to bind the morph LOD factor to
# this is 0 when there is no adjustment (highest) to 1 when the morph takes it completely
# to the same position as the next lower LOD
# USE THIS IF YOU USE HIGH-LEVEL VERTEX PROGRAMS WITH LOD MORPHING
#MorphLODFactorParamName=morphFactor
# The index of the vertex program parameter you wish to bind the morph LOD factor to
# this is 0 when there is no adjustment (highest) to 1 when the morph takes it completely
# to the same position as the next lower LOD
# USE THIS IF YOU USE ASSEMBLER VERTEX PROGRAMS WITH LOD MORPHING
#MorphLODFactorParamIndex=4
# The name of the material you will define to shade the terrain
#CustomMaterialName=TestTerrainMaterial
键值对的配置文件，用来帮助Ogre生成高度场地形
作用1：根据高度场图片和参数，生成地形的网络模型
作用2：根据自定义材质和GPU程序，生成相应的地形材质纹理
Ogre的TerrainSceneManager 会把高度长地图 “切割” 成多个区域，每个区域成为 Page（页），通过 Tile 瓦片的数量决定页的大小，Tile代表正方形顶点组
Heightmap（高度场图）和WorldTextur（整个场景的纹理），不需要大小一样，可以通过PageWorldX 和 PageWorldZ来重新设置大小
MaxHeight 设置高度场图的高度元素与世界坐标的对应
DetailTexTure 制定一层纹理循环附着在地面上，如草地或沙场，如果需要层叠纹理半透明效果需要自定义材质
2. 不通过配置文件直接创建地形（没懂）
Ogre::DataStreamPtr Process_Loader::getSceneDataStream(SceneData& data){
// 为Ogre创建类似一个配置文件格式的数据
Std::string mem;
SceneData::iterator it;
for (it=data.bengin(); it!=data.end(); it++){
mem += it->first;
mem += “=”;
mem += it->second;
mem+= “\n”;
}
void *pMem = (void *)new unsigned char[mem.length()+1];
memset(pMem, 0, mem.length()+1);
memcpy(pMem,mem.c_str(),mem.length()+1);
// 把这些放入一个新创建的MemoryDataStream
Ogre::DataStreamPtr pStr(new Ogre::MemoryDataStream(pMem, mem.length()+1));
return pStr;
}
// 在创建世界时载入
Ogre::DataStreamPtr pStr = getSceneDataStream(terrainDef);
m_sceneMgr->setWorldGeometry(pStr);