From .obj to .navmesh

[guizmows]

Encorporate your tile loading into Detours A* algorithm (FindPath). Works perfectly and you will still get the most optimal path.

very good idea thx, I'll check how to do it.

ATM I do it like this :



Green one are adt directly on line between my start and stop points.
Yellow one are adt I need to load in order to have all needed informations in order to create my path.

In violet you can see generated path.

[Millow]

Cause wowmapper had the same bug.

iirc, it was like (scale / 1024) which results in an int rather than a float, thus it's truncated.

Edit: Yes, it's unchanged... see line 225 in Sample_D3dByAreaId.cpp - wowmapper - World of Warcraft MAP ParsER - Google Project Hosting . Added a patch for it.

Edit: Nevermind, found your patch. Thx, I'll give it a shot. For the moment I'm still working on generating the .navmesh file based on the Namreeb's suggestions. If anyone has any other tips/suggestions, I'm all ears.

[cvccbum]

very good idea thx, I'll check how to do it.

ATM I do it like this :



Green one are adt directly on line between my start and stop points.
Yellow one are adt I need to load in order to have all needed informations in order to create my path.

In violet you can see generated path.

How are you determining what ADTs to load though?

[suicidity]

How are you determining what ADTs to load though?

Sweep a point or box across a line from the start -> end marking any ADTs it is inside, then you can also load the bounding ADTs.

[Bananenbrot]

Yellow ones are those loaded while applying the A* algorithm (open list or sth).
Green marks the most optimal path (closed list after applying the algorithm).

For actually doing this, you simply have to hook into the detour API. Main went more into detail about this a while ago.

[cvccbum]

are you guys loading each ADT into its own dtNavMesh and making an array for dtNavMeshQuery to find the path? I can't seem to get my multiple adt's to load correctly. Sometimes it's fine, and sometimes it won't work. If I dump the whole zone, the same location works so I know there is a path that should work.

[Millow]

Once I've created the navmesh with this code : dtCreateNavMeshData(&params, &navData, &navDataSize) (there is a lot more code before that...)
I was wondering how to save the navData ?
I can't seem to figure it out, I think everything else works fine.
I've tried to create a new dtNavMesh and copy the navData in it to simply call the saveAll function, but I don't know how to properly initizalize the new navMesh and then copy the navData in it.
I hope I make sense. Any help is appreciated. If I get this working, I'll post my code to convert an .obj to a .navmesh
Cheers

Edit: Using this code I managed to get it saved, but now its only 500k for 32_48.obj and it does not work in detour...

dtNavMesh* m_navMesh = 0;
m_navMesh = dtAllocNavMesh();
dtStatus status;  
status = m_navMesh->init(navData, navDataSize, DT_TILE_FREE_DATA);
saveAll("C:\\Users\\Millow\\Desktop\\Azeroth\\32_48.navmesh",m_navMesh);
 

I could post my whole cpp file, but from that, anyone spots any problems ?

[namreeb]

There is no provided function to save the nav mesh. It is up to the user (you) to determine how you want to save it. However, the obvious method is to simply write each tile struct to its own file, bit-for-bit.

[hamburger12]

It would be soo nice if you could post a small example how to safe just navdata my navdata is only 20kb after saving! :O

[namreeb]

You've got to be kidding me. Okay, here is a psuedo-code example:

bool BuildAndSaveTile(dtNavMeshCreateParams *params, string fileName)
{
  unsigned char *meshData;
  unsigned int meshDataSize;

  if (!dtCreateNavMeshData(params, &meshData, &meshDataSize))
    return false;
  
  ofstream outFile(fileName.c_str(), ios_flags::binary);

  outFile << meshData;

  outFile.close();
  return true;
}

bool LoadTile(string fileName, const int flags)
{
  ifstream inFile(fileName.c_str(), ios_flags::binary);

  if (!inFile)
    return false;

  unsigned char *inData = new unsigned char[FileSize(fileName)];

  inFile >> inData;

  dtNavMesh::addTile(inData, FileSize(fileName), flags);

  return true;
}

[Millow]

Thanx for the snippet. I didn't ask for code because its against the section rules and I wanted to tackle the problem myself, but hey, it's there, might as well use it...

The problem I had, and still might have, is that I thought that you had to put some kind of header in the file. But it seems like you don't put anything or it's already included ?

Anyhow, Namreeb, thank you again for all the help.
Mahalo !

[namreeb]

Stop asking me questions via private message. From now on they will not receive any reply what-so-ever. Sorry to be rude about it but I keep getting asked the same question. If you ask your questions publicly, future readers may benefit from the answer(s). Asking a question privately is just a way to hide the fact that either a) you're lazy and want to be spoon fed or b) you are trying to walk before you can crawl. I'm sick of wasting my time on it.

[hamburger12]

Thank you for your source thats nice but that don't help me becouse loading only 1 tile per time is allready working. what i need is how to handle for load more than one mesh :S. Sorry for askin

[namreeb]

In the case of loading an additional tile, you will already have the mesh (an instance of the dtNavMesh class, in the current R+D). To add another tile to it, call dtNavMesh::addTile again, passing in the data from the second file.

[hamburger12]

So in fact if your creating a "Tiled mesh" ther is only one tile right? do you set an X Y position for the tile positon?