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What format to use best?

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I want to extract a group of maps each with a group of rooms with textures but I don't know which format to use. I want the file format can be opened and edited with other 3d program. Here is my example structure for which I'm searching the best fit format:

struct Format {
unsigned long NumMaps;
Map* Dat;

struct Map {
unsigned long NumTexData; //Number Texture Headers
unsigned long NumRooms; //Number Rooms
Texture* TexData;
TextureHead* TexHead;
RoomsMesh* RomData;

TexData {
unsigned long CurText; //index of the TexData array, storing the Texture Data

RoomsMesh {

unsigned long NumVertices;
unsigned long NumIndixes;
unsigned long NumGroups;
Vertices* MshData;
Indixes* IndxData; //each index is short number
Groups* GroupData;


Vertices {
//Vertex x,y,x positions
float X;
float Y;
float Z;
unsigned long COLOR; //diffuse color
unsigned long COLOR1; //specular color
float U, V, U1, V1; //texture cordinates (2)

Groups {

unsigned long NumFaces;
unsigned long NumVertices;
unsigned long StartIndex;
unsigned long TextureIndx;
unsigned long BaseVertexIndex;
unsigned long LastVertx;
unsigned long PrimitiveType;


Any advices?

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