Custom Train Tracks: Difference between revisions

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|-
|-
|'''Status'''
|'''Status'''
|<span style="color:orange">Working on</span>
|<span style="color:orange">Work in progress</span>
|-
|-
|'''Branch'''
|'''Branch'''
|[https://github.com/multitheftauto/mtasa-blue/tree/custom-train-tracks custom-train-tracks]
|[https://github.com/multitheftauto/mtasa-blue/tree/feature/custom-train-tracks feature/custom-train-tracks]
|-
|'''Branch version'''
|1.5.3
|}
 
=== Functions ===
* [[createTrack]]
* [[removeDefaultTrack]]
* [[resetDefaultTrack]]
* [[setTrackLength]]
* [[getTrackLength]]
 
=== Media ===
* [https://www.youtube.com/watch?v=S_Q3Gk4jVr0&user=UCbl-5xYsT5KwnrfGdW9LYPQ MTA:SA Custom train tracks #1]</onlyinclude>
 
== Development ==
=== API ===
<syntaxhighlight lang="lua">
-- trainNode is a Vector3, or table of three coordinates
-- nodes is a table of trainNodes
 
track = TrainTrack(...nodes) -- createTrack(node1, node2, node3, ...)
track:getNodes() returns a table of Vector3s
track:getLength() -- getTrainTrack(track)
-- Default track functions
TrainTrack.removeDefault(int trackID)
TrainTrack.resetDefault(int trackID)
 
-- These functions already exist, but I'm not sure how these lengths are used or what they are for
 
</syntaxhighlight>
 
=== Findings ===
All information related custom train tracks are stored here.
 
==== Files ====
<syntaxhighlight lang="lua">
MTA10/game_sa
** CTrainTrackManagerSA.{cpp,h}
** CTrainTrackSA.{cpp,h}
 
MTA10/mods/shared_logic
** CClientTrainTrack.{cpp,h}
** luadefs/CLuaTrainTrackDefs.{cpp,h} -- contain definitions for the Lua API
 
MTA10/sdk/game
** CTrainTrack.h
** CTrainTrackManager.h
 
MTA10_Server/mods/deathmatch/logic
** CTrainTrackManager.{cpp,h}
** CTrainTrack.{cpp,h}
** luadefs/CLuaTrainTrackDefs.{cpp,h} -- contain definitions for the Lua API
</syntaxhighlight>
 
==== m_OriginalTrainTrackData ====
The [https://pastebin.mtasa.com/748483851 m_OriginalTrainTrackData array] contains the same values in CTrainTrackManager.cpp and CTrainTrackManagerSA.cpp.
 
The Init function is structured like so (pay special attention to the comments):
<syntaxhighlight lang="lua">
typedef struct
{
    short sX;              // x coordinate times 8
    short sY;              // y coordinate times 8
    short sZ;              // z coordinate times 8
    float fRailDistance;    // on-rail distance ( leave the client to calculate this )
    void Init ( short sX, short sY, short sZ, unsigned short sRailDistance, WORD padding )
    {
        this->sX = sX;
        this->sY = sY;
        this->sZ = sZ;
        this->fRailDistance = sRailDistance;
    }
} SRailNode;
</syntaxhighlight>
 
We need to make sense of the following things:
 
* Why is padding an argument here? (It doesn't do anything, and when Init() is called, real values are provided)
* Why are values repeated several times?
* Why does the last repeat have slightly different values?
 
=== Issues ===
* There may be some issues (relating to infinite loops) if a track runs across another or crosses another
** Infinite loop occurs at 006f8fda, see [http://i.imgur.com/HvBWAFm.png call stack]. Occurs when a track of two nodes have same x/y, but different z. Only occurs for tracks that ONLY consist of nodes atop each other.
*** Possible solution: when creation tracks, ensure that atleast one of the nodes has a different x/y to any other node.
* Tracks may not be cleaned up -> See CTrainTrackManager::ResetTracks
* See CTrainTrackManager and CTrainTrackManagerSA - why is this file so big? Why are coordinates provided multiple times for the same track? Which ones are right?
* <strike>int CWorldSA::FindClosestRailTrackNode needs updating. It needs to use MAX_TOTAL_TRACKS and the train manager.</strike> [https://github.com/multitheftauto/mtasa-blue/commit/09e3ee8f25810c17742728f038786b6a223c5296 See 09e3ee8f25810c17742]
 
=== Re-merge ===
<section name="This section has been archived" collapse="true">
{| class="wikitable" style="width: auto; table-layout: fixed;"
|-
|'''Status'''
|<span style="color:red">Abandoned</span>
|-
|'''Branch'''
|[https://github.com/multitheftauto/mtasa-blue/tree/custom-train-tracks-old custom-train-tracks-old] (renamed from custom-train-tracks)
|-
|-
|'''Branch version'''
|'''Branch version'''
|1.4
|1.4
|}</onlyinclude>
|}
= Functions =
* [[createTrainTrack]]
* [[destroyTrainTrack]]
* [[setTrainTrackLength]]
* [[getTrainTrackLength]]
* [[setTrainTrackNumberOfNodes]]
* [[getTrainTrackNumberOfNodes]]
* [[getTrainTrackID]]
* [[getVehicleTrainTrack]]
* [[setVehicleTrainTrack]]
* [[getTrainTrackPosition]]
 
= Media =
None.


= Active Commits =
The old '''custom-train-tracks''' branch contains commits cherry-picked and other merges from the 1.4 branch. The first task in updating this branch is to distinguish between merge commits and actual branch commits:
The old '''custom-train-tracks''' branch contains commits cherry-picked and other merges from the 1.4 branch. The first task in updating this branch is to distinguish between merge commits and actual branch commits:


Line 46: Line 130:
* ... Merged revision(s) 6092-6137 from trunk [https://github.com/multitheftauto/mtasa-blue/commit/61976a30a1edda6150d1840833ab8ac2d22ae59a 61976a30a1edda6150d1840833ab8ac2d22ae59a]
* ... Merged revision(s) 6092-6137 from trunk [https://github.com/multitheftauto/mtasa-blue/commit/61976a30a1edda6150d1840833ab8ac2d22ae59a 61976a30a1edda6150d1840833ab8ac2d22ae59a]


This means that there are only four commits that need to be merged into the new branch.
This means that there are only four commits that need to be merged into the new branch. <strike>There is currently a packet issue introduced by the merge that needs to be fixed.</strike>
</section>
[[Category: Development]]

Latest revision as of 22:12, 3 October 2016

This branch makes it possible to make your own train tracks.

Status Work in progress
Branch feature/custom-train-tracks
Branch version 1.5.3

Functions

Media

Development

API

-- trainNode is a Vector3, or table of three coordinates
-- nodes is a table of trainNodes

track = TrainTrack(...nodes) -- createTrack(node1, node2, node3, ...)
track:getNodes() returns a table of Vector3s
track:getLength() -- getTrainTrack(track)
-- Default track functions
TrainTrack.removeDefault(int trackID)
TrainTrack.resetDefault(int trackID)

-- These functions already exist, but I'm not sure how these lengths are used or what they are for

Findings

All information related custom train tracks are stored here.

Files

MTA10/game_sa
** CTrainTrackManagerSA.{cpp,h}
** CTrainTrackSA.{cpp,h}

MTA10/mods/shared_logic
** CClientTrainTrack.{cpp,h}
** luadefs/CLuaTrainTrackDefs.{cpp,h} -- contain definitions for the Lua API

MTA10/sdk/game
** CTrainTrack.h
** CTrainTrackManager.h

MTA10_Server/mods/deathmatch/logic
** CTrainTrackManager.{cpp,h}
** CTrainTrack.{cpp,h}
** luadefs/CLuaTrainTrackDefs.{cpp,h} -- contain definitions for the Lua API

m_OriginalTrainTrackData

The m_OriginalTrainTrackData array contains the same values in CTrainTrackManager.cpp and CTrainTrackManagerSA.cpp.

The Init function is structured like so (pay special attention to the comments): 

typedef struct
{
    short sX;               // x coordinate times 8
    short sY;               // y coordinate times 8
    short sZ;               // z coordinate times 8
    float fRailDistance;    // on-rail distance ( leave the client to calculate this )
    void Init ( short sX, short sY, short sZ, unsigned short sRailDistance, WORD padding )
    {
        this->sX = sX;
        this->sY = sY;
        this->sZ = sZ;
        this->fRailDistance = sRailDistance;
    }
} SRailNode;

We need to make sense of the following things:

  • Why is padding an argument here? (It doesn't do anything, and when Init() is called, real values are provided)
  • Why are values repeated several times?
  • Why does the last repeat have slightly different values?

Issues

  • There may be some issues (relating to infinite loops) if a track runs across another or crosses another
    • Infinite loop occurs at 006f8fda, see call stack. Occurs when a track of two nodes have same x/y, but different z. Only occurs for tracks that ONLY consist of nodes atop each other.
      • Possible solution: when creation tracks, ensure that atleast one of the nodes has a different x/y to any other node.
  • Tracks may not be cleaned up -> See CTrainTrackManager::ResetTracks
  • See CTrainTrackManager and CTrainTrackManagerSA - why is this file so big? Why are coordinates provided multiple times for the same track? Which ones are right?
  • int CWorldSA::FindClosestRailTrackNode needs updating. It needs to use MAX_TOTAL_TRACKS and the train manager. See 09e3ee8f25810c17742

Re-merge

Click to expand [+]
This section has been archived
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