BlenderDev/mesh

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Mesh的结构定义如下：

代码:

typedef struct Mesh {

  ID id;

  struct BoundBox *bb;

  ListBase effect;

  ListBase disp;

  struct Ipo *ipo;

  struct Key *key;

  struct Material **mat;

  void *mface, *dface, *tface;

  struct MVert *mvert;

  struct MEdge *medge;

  struct MDeformVert *dvert;   /* __NLA */

  struct MCol *mcol;

  struct MSticky *msticky;

  struct Mesh *texcomesh;

  float *orco;

     /* not written in file, caches derived mesh */

  struct DerivedMesh *derived;

     /* hacky place to store temporary decimated mesh */

  struct DispListMesh *decimated;

  struct OcInfo *oc;      /* not written in file */

  void *sumohandle;

  int totvert, totedge, totface;

  int texflag;

  float loc[3];

  float size[3];

  float rot[3];

  float cubemapsize, pad;

  short smoothresh, flag;

  short subdiv, subdivr;

  short totcol;

  short subsurftype;

} Mesh;

这个定义在DNA_mesh_types.h中，这个Mesh的定义和我们正常定义差不多，其中，顶点的定义在DNA_meshdata_type.h中，一般在VS的工程中找不到这个文件，需要自己在makesdna文件夹下找一下，其定义如下：

代码:

typedef struct MFace {

  unsigned int v1, v2, v3, v4;

  char puno, mat_nr;

  char edcode, flag;

} MFace;

typedef struct MEdge {

  unsigned int v1, v2;

  char crease, pad;

  short flag;

} MEdge;

typedef struct MDeformWeight {

  int            def_nr;

  float         weight;

  struct Bone      *data;      /* Runtime: Does not need to be valid in file */

} MDeformWeight;

typedef struct MDeformVert {

  struct MDeformWeight *dw;

  int totweight;

  int reserved1;

} MDeformVert;

typedef struct MVert {

  float   co[3];

  short   no[3];

  char flag, mat_nr;

} MVert;

typedef struct MCol {

  char a, r, g, b;

} MCol;

typedef struct MSticky {

  float co[2];

} MSticky;

这是mail list 给我的解释，没有翻译：

> typedef struct Mesh {

> ID id;

id: used for storage of the Mesh struct in the library

> struct BoundBox *bb;

The boundbox of the mesh (surprise!)

> ListBase effect;

A list of effects applied to the mesh (again, surprise!)

> ListBase disp;

A list of display lists, I suppose. Not sure.

> struct Ipo *ipo;

A list of IPOs, for vertex keys, etc.

> struct Key *key;

A list of vertex keys (surprise!)

> struct Material **mat;

A list of materials applied to this mesh (surprise!)

> void *mface, *dface, *tface;

tface stores UV mapping, I think together with mface, in some way. About

dface, I'm not sure. This part is pretty chaotic from what I remember.

> struct MVert *mvert;

The vertices.

> struct MEdge *medge;

The edges.

> struct MDeformVert *dvert; /* __NLA */

This stores vertex groups.

> struct MCol *mcol;

This stores vertes colors.

> struct MSticky *msticky;

Sticky coordinates.

> struct Mesh *texcomesh;

Pointer to the mesh giving texture coordinates ("TexMesh")

> float *orco;

Used for texture mapping, storing the original texture coordinates of the

undeformed mesh - or something. Not sure, check the code for the exact

meaning.

> /* not written in file, caches derived mesh */

> struct DerivedMesh *derived;

> /* hacky place to store temporary decimated mesh */

> struct DispListMesh *decimated;

>

> struct OcInfo *oc; /* not written in file */

> void *sumohandle;

sumohandle is game-engine related and stores a handle for the physics

system.

> int totvert, totedge, totface;

Self-explanatory.

> int texflag;

Should be explained further below in the file.

> float loc[3];

> float size[3];

> float rot[3];

Stores texture space transform.

> float cubemapsize, pad;

Not sure about cubemapsize.

> short smoothresh, flag;

Not sure about smoothresh, flag is explained further below.

> short subdiv, subdivr;

Should be clear, SubSurf levels for OGL/Render.

> short totcol;

Total amount of materials on the mesh.

> short subsurftype;

>

> } Mesh;