Difference between revisions of "Script Path"

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'''Spath'''.dat files are '''scripted path''' files used only in Vice City to script an object onto a path that is too much to just shove into the <code>main.scm</code>. These files are located in the maps/data folder in the Vice City directory. This file contains coordinates for the <code>main.scm</code> to use. By default, Vice City has only one scripted path file, the <code>spath0.dat</code>, which controls Cortez's yacht in the mission "All Hands On Deck!"
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[[File:VCSpath.jpg|thumb|right|250px|Vice City's <code>spath0.dat</code> map]]
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A '''Script Path''' (also named '''Object Path''') lets the [[main.scm|script]] in [[Vice City]] attach objects to a path and control their movement along it. The coordinates for the path are stored in a plain text file located in <code>{{Dir|vc}}\data\paths\spath0.dat</code>, which is used by Cortez's yacht in the mission "All Hands On Deck!" The game can read any number of script path files in the same directory (<code>spath1.dat</code>, <code>spath2.dat</code>, <code>spath3.dat</code>, etc.) but it can only have up to three script paths loaded at a time. Up to six objects can be attached to a script path at a time. Data on the state and properties of a loaded script path are saved in [[Saves (GTA VC)#Block 17: Script Paths|block 17 of the save file]]. The concept for script paths closely resembles [[flight.dat|flight]] paths used for airborne NPC vehicles.
  
==Format==
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== Format for spath*.dat ==
The file starts with the number of coordinates that will be used in the file. The rest of the file are X, Y, and Z coordinates linked as a path in the game.
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{{Pre|1=
 +
NumNodes
 +
X Y Z
 +
}}
  
==How 2.0==
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{|class="wikitable center-col-1 center-col-2"
The scripted path file needs to be defined in the main.scm using opcode [[049C]] in order for it to work. To attach an object onto the path, first define the object. Create the object using the opcode [[029B]]. Attach the object onto the path using the opcode [[049D]]. You can attach as many object as you want onto the same path. Lastly, set the speed of the object on the path using opcode [[049E]]. To remove references to the scripted path file from the ,code.main.scm,/code., use the opcode [[04A1]]. The opcode [[049F]] sets the distance you want the object to move on the path. In order to add more scripted path files, create a file named spath#, '#' being an integer in order after the last one.
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!style="width: 3em;" |{{Icon|VC}}
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!style="width: 12em;" |Identifier
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!style="width: 6em;" |Type
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!Description
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|-
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!colspan="4" |Section 1: Number of path nodes
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|-
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|A ||NumNodes ||integer ||The number of lines that are to be read from the file.
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|-
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!colspan="4" |Section 2: Path nodes
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|-
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|A,B,C ||X, Y, Z ||float[3] ||X, Y, Z coordinates, each line linked to create a path
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|-
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|colspan="4" {{a|l}} |Repeat up to the number of path nodes
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|}
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Undefined lines of coordinates will use the center of the world (0, 0, 0) as the point for the path.
  
==Current Usage==
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== Mission script ==
Currently, the Liberty City and Myriad Islands modifications for Vice City uses this feature. In the Liberty City mod, this is used to move the train around the city. In Myriad Islands, it was breifly used in a user-made mission to move Cortez's yacht.
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The following example explains how <code>spath0.dat</code> is used in the original script in [[Sanny Builder]]'s format to move Cortez's yacht. First, the script path is initialized using opcode [[049C]].
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{{Pre|class=sb-code|1=
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[[049C]]: <span class="nv">$722</span> = scripted_path_file <span class="m">0</span> width <span class="m">90.0</span>
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}}
  
==Backup==
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Next, objects need to be created using opcode [[029B]] (opcode [[0107]] can also be used to create them).
If you did not backup the file and need the original file, get it here.<br>
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{{Pre|class=sb-code|1=
[http://sodagirl.xmgfree.com/spath0.dat Spath0.dat]
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[[029B]]: <span class="nv">$714</span> = init_object <span class="nt">#YT_MAIN_BODY</span> at -<span class="m">375.499</span> -<span class="m">1322.31</span> <span class="m">9.81124</span>
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[[029B]]: <span class="nv">$715</span> = init_object <span class="nt">#YT_MAIN_BODY2</span> at -<span class="m">375.499</span> -<span class="m">1322.31</span> <span class="m">9.81124</span>
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[[029B]]: <span class="nv">$717</span> = init_object <span class="nt">#YT_DOORS14</span> at -<span class="m">375.499</span> -<span class="m">1322.31</span> <span class="m">9.81124</span>
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[[029B]]: <span class="nv">$718</span> = init_object <span class="nt">#YT_TMP_BOAT</span> at -<span class="m">375.499</span> -<span class="m">1322.31</span> <span class="m">9.81124</span>
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[[029B]]: <span class="nv">$719</span> = init_object <span class="nt">#LODMAIN_BODY</span> at -<span class="m">375.499</span> -<span class="m">1322.31</span> <span class="m">9.81124</span>
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}}
  
[[Category:Map Formats]][[Category:GTA VC]]
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These objects are attached to the path using opcode [[049D]].
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{{Pre|class=sb-code|1=
 +
[[049D]]: attach_scripted_file <span class="nv">$722</span> with_object <span class="nv">$714</span>
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[[049D]]: attach_scripted_file <span class="nv">$722</span> with_object <span class="nv">$715</span>
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[[049D]]: attach_scripted_file <span class="nv">$722</span> with_object <span class="nv">$717</span>
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[[049D]]: attach_scripted_file <span class="nv">$722</span> with_object <span class="nv">$718</span>
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[[049D]]: attach_scripted_file <span class="nv">$722</span> with_object <span class="nv">$719</span>
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}}
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Lastly, opcode [[049E]] is used to prevent the yacht from moving along the path.
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{{Pre|class=sb-code|1=
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[[049E]]: set_scripted_file <span class="nv">$722</span> speed_to <span class="m">0.0</span>
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}}
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During the mission, the yacht's speed varies and is warped along the path in two occasions using opcode [[049F]].
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{{Pre|class=sb-code|1=
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[[049E]]: set_scripted_file <span class="nv">$722</span> speed_to <span class="m">5.0</span>
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<span class="c1">// ...</span>
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[[049F]]: set_scripted_file <span class="nv">$722</span> distance_along_path_to <span class="m">2700.0</span>
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}}
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When you fail the mission, the yacht is reset back to the beginning.
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{{Pre|class=sb-code|1=
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[[049F]]: set_scripted_file <span class="nv">$722</span> distance_along_path_to <span class="m">0.0</span>
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[[049E]]: set_scripted_file <span class="nv">$722</span> speed_to <span class="m">0.0</span>
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}}
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When you pass the mission, the objects and path are no longer needed so they are removed from the game using opcodes [[0108]] and [[04A1]] respectively.
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{{Pre|class=sb-code|1=
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0108: destroy_object <span class="nv">$714</span>
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0108: destroy_object <span class="nv">$715</span>
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0108: destroy_object <span class="nv">$717</span>
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0108: destroy_object <span class="nv">$718</span>
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0108: destroy_object <span class="nv">$719</span>
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04A1: release_scripted_file <span class="nv">$722</span>
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}}
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Note that if a script path is actively moving objects, replays will be disabled.
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== See also ==
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* {{Icon|3}} [[chase.dat|Chase scene]]
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* {{Icon|SA}} {{Icon|4}} [[Carrec|Car recording]]
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{{VC-navi}}
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 +
[[Category:Map Formats]][[Category:Mission Script]]

Latest revision as of 09:44, 4 September 2017

Vice City's spath0.dat map

A Script Path (also named Object Path) lets the script in Vice City attach objects to a path and control their movement along it. The coordinates for the path are stored in a plain text file located in .\data\paths\spath0.dat, which is used by Cortez's yacht in the mission "All Hands On Deck!" The game can read any number of script path files in the same directory (spath1.dat, spath2.dat, spath3.dat, etc.) but it can only have up to three script paths loaded at a time. Up to six objects can be attached to a script path at a time. Data on the state and properties of a loaded script path are saved in block 17 of the save file. The concept for script paths closely resembles flight paths used for airborne NPC vehicles.

Format for spath*.dat

NumNodes
X Y Z
Vice City Identifier Type Description
Section 1: Number of path nodes
A NumNodes integer The number of lines that are to be read from the file.
Section 2: Path nodes
A,B,C X, Y, Z float[3] X, Y, Z coordinates, each line linked to create a path
Repeat up to the number of path nodes

Undefined lines of coordinates will use the center of the world (0, 0, 0) as the point for the path.

Mission script

The following example explains how spath0.dat is used in the original script in Sanny Builder's format to move Cortez's yacht. First, the script path is initialized using opcode 049C.

049C: $722 = scripted_path_file 0 width 90.0

Next, objects need to be created using opcode 029B (opcode 0107 can also be used to create them).

029B: $714 = init_object #YT_MAIN_BODY at -375.499 -1322.31 9.81124
029B: $715 = init_object #YT_MAIN_BODY2 at -375.499 -1322.31 9.81124
029B: $717 = init_object #YT_DOORS14 at -375.499 -1322.31 9.81124
029B: $718 = init_object #YT_TMP_BOAT at -375.499 -1322.31 9.81124
029B: $719 = init_object #LODMAIN_BODY at -375.499 -1322.31 9.81124

These objects are attached to the path using opcode 049D.

049D: attach_scripted_file $722 with_object $714
049D: attach_scripted_file $722 with_object $715
049D: attach_scripted_file $722 with_object $717
049D: attach_scripted_file $722 with_object $718
049D: attach_scripted_file $722 with_object $719

Lastly, opcode 049E is used to prevent the yacht from moving along the path.

049E: set_scripted_file $722 speed_to 0.0

During the mission, the yacht's speed varies and is warped along the path in two occasions using opcode 049F.

049E: set_scripted_file $722 speed_to 5.0
// ...
049F: set_scripted_file $722 distance_along_path_to 2700.0

When you fail the mission, the yacht is reset back to the beginning.

049F: set_scripted_file $722 distance_along_path_to 0.0 
049E: set_scripted_file $722 speed_to 0.0

When you pass the mission, the objects and path are no longer needed so they are removed from the game using opcodes 0108 and 04A1 respectively.

0108: destroy_object $714
0108: destroy_object $715
0108: destroy_object $717
0108: destroy_object $718
0108: destroy_object $719
04A1: release_scripted_file $722

Note that if a script path is actively moving objects, replays will be disabled.

See also