Blender的mesh 数据结构

这是mail list 给我的解释，没有翻译，大家先看看：

> 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;

在UIFrameWork中，用的是EditMesh数据结构，它比这个结构简单很多。关于这个结构的使用，以后会说