Char 是8位整型变量类型
Short 是16位整型变量类型
Int 是32位整型变量类型
Float 是32位浮点变量类型
Vec2 是float[2]
Vec3 是float[3]
Mat3x3 是float[3][3] 2维
TexVec 是纹理U/V坐标向量
文件头
MD3_HEADER
char ID[4]; //文件标志"IDP3"
Version; //文件版本0x0f char FileName[68]; //文件名
BoneFrame_num; //BoneFrames数 Tag_num; //每个BoneFrame
Tag数 Mesh_num; //Mesh(几何网格)数 MaxSkin_num; //最大可用Skin(材质)数 HeaderLength; //文件头长度. Tag_Start; //Tag(标签)结构开始位置. Tag_End; //标签Tag结束位置也就是几何网格结构起始位置 FileSize; //文件大小 注释:
Tag
开始位置和结束位置相同则表示没有Tag Tag_Num有时为零,当然表示没有Tag.
我不能确定Tag有什么作用,也许对骨骼动画系统有用吧.
文件头后是Tag列表,如果有效那么tags
总和等于Tag_num个BoneFrame_num. 注意: 我们称的为'Tags',是
在MD3文件中它为'Tag_'; TAG:
char Name[64]; //name of 'tag' as it's usually
//called in the md3 files try to
//see it as a sub-mesh/seperate
//mesh-part.
//sometimes this 64
may //contain some garbage, but
//i've been told this is because
//some tools leave garbage in
//those
s, but they ARE //
s... Vec3 Postition; //relative position of tag
Vec3x3 Rotation; //the direction the tag is facing relative to the rest of the model
注释:
fairly obvious i think, the name is the name of the tag.
"position" is the relative position and "rotation" is the relative rotation to the rest of the model.
在tags的后是,'boneframe'骨架帧.几何网格帧
个数通常 After the tags come the 'boneframes', frames in the bone animation.
The number of meshframes is usually identical to this number or simply 1.
The header variable BoneFrame_num holds the ammount of BoneFrame..
BONEFRAME:
没有完全证实:
float Mins[3];
float Maxs[3];
float Position[3];
float scale;
char Creator[16]; //我想这应该是制作者
名字,但仅仅是猜测. 注释:
Mins,Maxs,和Position可能是正确
,scale则是猜测. If you divide the maximum and minimum xyz values of all the vertices from each meshframe you get
the exact values as mins and maxs..
Position is the exact center of mins and maxs, most of the time anyway.
Creator 非常可能是制作模型
生成文件名通常为(from ASE)"或 .3ds. 在的后为几何网格头:mesh-headers;
几何网格总数为Mesh_num所指明.
注意:
个Mesh包含Mesh-header,表皮, 3角形,纹理坐标和顶点. Each mesh contains that data, and the next mesh will only start after the triangles, meshes etc. of the previous mesh.
让我惊讶
是Md3文件并不包含很多个Mesh,这是我们需要深入了解. MESH:
char ID[4]; //id, must be IDP3
char Name[68]; //name of mesh 65 chars, 32 bit aligned
68 chars MeshFrame_num; //number of meshframes in mesh Skin_num; //number of skins in mesh Vertex_num; //number of vertices Triangle_num; //number of Triangles Triangle_Start; // 3角形数据开始位置,相对于Mesh_Header HeaderSize; //头长度 TexVec_Start; //纹理坐标数据开始位置,相对于Mesh_Header Vertex_Start; //顶点开始位置,相对于Mesh_Header MeshSize; //Mesh大小 注释:
Meshframe_num 类似于quake1/quake2
总帧数. (these frames work on a morph like way, the vertices are moved from one position to another instead of rotated around eachother like in bone-based-animations)
Skin_num 是Skins
个数. 些Skin是动画. Triangle_Start, TexVec_Start 和 Vertex_Start 是以字节为单位从Mesh Header指出相应
位置. Mesh header 的后是Skin(纹理)
它
个数由上面Mesh_header中Skin_num决定. SKIN:
char Name[68]; //name of skin used by mesh 65 chars,32 bit aligned
68 chars 注释:
Name 纹理
名字, 在baseq3路径下. Q3 通过特殊
思路方法取得纹理. 脚本放置在baseq3/script路径下,保存了那些表面采用动画及多重纹理映射.
Now the strange thing is,
you remove the ".tga" at the end of the skin, and that name is used in the script files, than that scripted surface is used. If it isn't mentioned in the script files then the filename is used to load the tga file.
纹理的后接着是 3角形数据,个数由Triangle_num指出.
TRIANGLE
Triangle[3]; //vertex 1,2,3 of triangle 注释:
3角形结构是很简单
结构.个 3角形由 3个顶点构成,如果你有个顶点列表,比如你有28个顶点列表,个 3角形由顶点1,14,7构成,那么 3角形结构就是整形1,14,7 7. 3角形列表的后是纹理UV坐标个数由顶点决定:
TEXTURE U/V COORDINATES:
Vec2 TexVec; //Texture U/V coordinates of vertex
注释:
它使 3角形知道如何给自己贴上纹理.
纹理坐标的后是顶点坐标,由Vertex_num指出个数.
VERTICES:
//!!!注意变量类型!!! signed!
signed
Vec[3]; //顶点 X/Y/Z 坐标 unsigned char EnvTex[2]; //环境贴图坐标
注释:
Vec 包含 3d xyz
顶点坐标. EnvTex 包含环境贴图
纹理坐标.
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