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• Callback: Custom station layout
  ...ly possible return values are 00, 02, 04 and 06. Their meaning is the same as in prop. 0E. ...ould contain. For the same reason, it uses the same cargo type in action 3 as the construction menu does (i.e., type FF if defined or else the default).
  884 bytes (151 words) - 18:57, 16 June 2011
• Callback: Refit cost factor
  ...d refit cost factor, cost base depends on the vehicle type and is the same as for the refit cost property. Negative cost factors allow refit revenue. ...llowed as an auto-refit as long as bit 4 of the miscellaneous flags is set as well.
  1 KB (201 words) - 20:15, 22 September 2013
• Callback: Construction stage changes
  ...ormal gameplay, that means exactly four times). Can return the same values as callback 1B. Variable 40 contains the new stage. You can return FF for stag ...llbacks, if the high byte of the result is nonzero, it will be interpreted as a sound effect number, and the corresponding sound effect will be played at
  521 bytes (82 words) - 18:57, 16 June 2011
• Callback: Vehicle Start/stop check
  |00..FE|| Display error message using D0xx (D000..D0FE) text as second line. |100..1FE|| Display error message using D0xx (D100..D1FE) text as second line.
  1 KB (205 words) - 13:29, 1 April 2012
• NML:Warnings
  ...s, which made pure white images with sprites common in NewGRF development. As such the pure white pixel test is also a way to detect so cases where the p ...iven in the source (image or sound file) does not match the capitalization as found in the file system.
  1 KB (224 words) - 22:28, 20 February 2021
• Callback: Length of animation frame
  ...frame should last. The value of the delay should be given in the same way as for property 1B/10/17. Decreasing the return value speeds the animation up Note: This is one of the most time consuming callbacks as it is called for every animated tile every ≈30 milliseconds. For better p
  788 bytes (127 words) - 18:57, 16 June 2011
• NML:Recolour sprites
  The above example will remap colour 0xC6 as 0x28, 0xC7 as 0xF5 and the range 0xC8 to 0xCD to the colours 0x0A..0x0F. This is one of t
  878 bytes (146 words) - 13:22, 18 December 2013
• Callback: New signals sprite drawing callback
  ...ic action 3 must be used. It must be processed by a VarAction2 feature 0E, as indicated in the following link: [[VarAction2NewSignals]].
  252 bytes (37 words) - 16:33, 19 June 2011
• NML:Railtypetable-Roadtypetable-Tramtypetable
  ...re identical to that of <code style="color:darkgreen">railtypetable</code> as described below ...ype. If the railtype SHNY is not available then trains using RT_SHINY_RAIL as track type will fallback to RAIL.
  2 KB (265 words) - 19:35, 27 February 2020
• Callback: Monthly random production change
  Works exactly the same way as [[Callbacks#Random production change (29) |callback 29]], except that it's
  235 bytes (28 words) - 18:58, 16 June 2011
• Callback: Autoreplace vehicle selection
  ...to upgrade the current vehicle to and the vehicle variables are available as usual to decide which IDs would be appropriate to upgrade to. ...t that is available to the player and has the required minimum reliability as set by the autoreplace switch, and abort the callback sequence at this poin
  2 KB (288 words) - 22:12, 30 August 2022
• Callback: Next animation frame
  |FE||continue with next frame as usual. You can return this for stages where you don't want to do anything s ...llbacks, if the high byte of the result is nonzero, it will be interpreted as a sound effect number, and the corresponding sound effect will be played at
  908 bytes (142 words) - 07:13, 11 January 2013
• NML:Realsprites
  The format is as follows. Optional parts are placed between parentheses: ...ted below, all parameters are numbers. They can be any expression, as long as they evaluate to a compile-time constant.
  5 KB (807 words) - 14:12, 6 June 2020
• Action13
  ...anslation on every player. However, GRFs with only action 13 can be loaded as [[OpenTTD static NewGRF]]. {{grfFrom|8}} GRF version 8 alleviates this prob The data looks as follows:
  2 KB (254 words) - 23:25, 27 January 2022
• NML:Animation speed
  ...imum value is 2 (=4 ticks). The ingame length as well real length is given as rounded values for reference only, assuming normal game speed.
  924 bytes (110 words) - 16:45, 21 August 2011
• NML:LocationCheckResults
  The following values can be used as return values for the <code style="color:darkgreen">location_check</code> c | Item can't be built, show the string as error message.
  2 KB (249 words) - 20:59, 30 August 2022
• Callback: Articulated engine
  If this callback is in use, additional vehicles will be added as long as the callback says so. ...n the first vehicle contains cargo, the callback must work in the buy menu as well. This means that it will be called with cargo type FF in the action 3.
  2 KB (291 words) - 12:21, 18 April 2015
• NML:Deactivate other NewGRFs
  With this statement, you can deactivate other NewGRFs. As parameters, you can supply any number of grfids (4-byte strings) to deactiv
  409 bytes (59 words) - 16:34, 21 August 2011
• NML:Changes 0.4
  * Statistics on the NewGRF on used IDs for vehicles, houses, etc as well as available switches, parameters etc
  2 KB (227 words) - 13:21, 19 February 2015
• Callback: Custom shape check
  ...of the returned value is different in GRF version 7; it works the same way as [[Callbacks#Industry location permissibility (28) |callback 28]]. {{ottdp| are the same as the lowest byte of variable 18 of callback 28.
  2 KB (290 words) - 13:28, 1 April 2012
• NML:Replace TTD sprites
  ...ist_of_tiles|the tile list]] for a list of terrain sprites). The syntax is as follows: .../script.php?feature=spritesbyfile&q= OpenGFX author overview] can be used as a reference to look up these sprite numbers.
  2 KB (359 words) - 06:35, 28 February 2013
• Callback: Visual effect and wagon power
  ...cles ({{ottd|1.1|r21238}} Since OpenTTD r21238 for road vehicles and ships as well). ...used instead. &nbsp;For possible return values, refer to these properties as well.
  1 KB (200 words) - 23:16, 3 August 2011
• Action3LiveryOverride
  ...elicopter rotors, and in the future, the look of train visual effects such as steam and diesel smoke. The format of a wagon override is the same as a regular action 3 entry, with the following special considerations:
  3 KB (527 words) - 22:30, 27 August 2011
• Callback: Industry availability
  This callback is intended for limiting your type as a whole, so you can't access any industry-specific variables, just the glob |0001..00FF|| Allow construction, and use the returned value as probability for appearance on the map. (Instead of using [[Action0/Industri
  2 KB (229 words) - 13:25, 1 April 2012
• PalettesAndCoordinates
  ...e entries for palette cycling to do some colour-animation, don't use these as regular colours. These entries are often called "action colours". ...web.archive.org/web/20121115112036/https://dev.openttdcoop.org/documents/1 as .zip.
  5 KB (818 words) - 12:30, 22 March 2024
• ActionA
  The data looks as follows: The set of <num-sprites> and <first-sprite> is repeated as often as <num-sets> specifies.
  4 KB (556 words) - 09:34, 29 December 2023
• Callback: Station availability
  ...r it can be selected in the station construction window. &nbsp;Returning 1 as callback return indicates the station can be built, and a return code of 0
  416 bytes (62 words) - 13:35, 1 April 2012
• VariationalAction2/Canals
  |Height above ground, top parts of locks have the same height as the lower parts. Note: this returns height in increments of 1 (and not 8) |Random byte for plain canals and river tiles, otherwise zero (under bridges as example, or old savegames)||
  1 KB (161 words) - 21:46, 6 May 2013
• Callback: Object slope check
  {{grfTill|7}} For GRF version 7 and below the return values are the same as for [[Callbacks#Industry_location_permissibility_.2828.29|callback 28]], bu {{grfFrom|8}} For GRF version 8 and above the return values are the same as for [[Callbacks#Industry_location_permissibility_.2828.29|callback 28]]. Re
  1 KB (190 words) - 13:18, 1 April 2012
• Callback: Trigger building destruction
  ...perty 16. Return 0 to do nothing, or 1 to remove the building from the map as if the town decided to destroy it. You can use this for example to remove a
  446 bytes (67 words) - 13:24, 1 April 2012
• Callback: Cargo Subtype Display
  <b>NOTE: As of OpenTTD 13, this feature is considered deprecated for most uses. Use var ...allback says to stop. &nbsp;All the returned variations are then displayed as refitting options, with all options that have the same cargo type and callb
  1 KB (229 words) - 09:59, 10 May 2024
• Action6
  ...is no longer true, Action 6 will be applied both at initialization as well as activation. You can therefore use either action 7 or 9 to skip it, whicheve The data looks as follows:
  5 KB (871 words) - 22:02, 30 August 2022
• Callback: Watched cargo accepted
  ...llbacks, if the high byte of the result is nonzero, it will be interpreted as a sound effect number, and the corresponding sound effect will be played at
  1 KB (241 words) - 22:39, 31 October 2011
• NML:Item
  ...ype of the value depends on the property, some properties require a string as value and some an expression. For some properties you can optionally specif ...tem-block. It allows to define the graphics for a particular item, as well as various callbacks. Callbacks are used to define various things at run time,
  4 KB (689 words) - 14:05, 5 November 2014
• ActionD
  ...ter (i.e. those usually set as options in the newgrf(w).cfg file), as well as do math on them. The data looks as follows:
  5 KB (746 words) - 16:56, 18 March 2015
• NML:Snow line
  ...ly an integer from 1 up to and including 365, so you may also define a day as a number. The values can be any value between 0 and 255. 255 means 'no snow ...le="color:darkgreen">equal</code> mode, the height of the snow is the same as the day before, unless the day is listed in the <code style="color:darkgree
  2 KB (313 words) - 17:57, 11 May 2014
• NML:GRF
  ...u can specify some parameter settings that the user will be able to change as part of the newgrf configuration. These can for example be used to disable This gives the parameter name as shown in the parameter configuration dialogue of OpenTTD.
  3 KB (469 words) - 07:18, 11 April 2015
• Action0/Airports
  ...via action3) that isn't defined, your request is ignored, but not reported as an error, either. This means that if you want to conditionally define an ID |10||W||{{ottdp|1.1|no|ottdrev=r19459}}||TextID to be used as airport name
  3 KB (537 words) - 13:09, 5 December 2011
• Callback: Show additional text in industry window
  ...note, though, that the text handler will see it as an array of bytes, not as an array of DWORDs, so you will have to pack two words into a register when
  2 KB (288 words) - 13:30, 1 April 2012
• NML:Town names
  ...ed in two ways, as generator of (partial) town names for another block, or as top-level town names block, a starting point of town names in the grf file.
  2 KB (311 words) - 22:07, 1 February 2014
• NML:Switch
  ...callback. A returned expression may contain variables (with the same scope as the switch block itself), parameter accesses and everything else that a nor ...style="color:darkgreen">return;</code> returns the computed value directly as a callback result. Note that the maximum value for callback results is 3251
  5 KB (880 words) - 21:31, 30 August 2022
• Action12
  The data looks as follows: ...ing the action 12 must be the real sprites for all glyphs, as many sprites as all <num-char> added up.
  3 KB (514 words) - 11:57, 20 November 2011
• Action0
  The data for Action 0 looks as follows: ...OpenTTD since r13482, extended IDs (up to 65535) can be used for vehicles as well. However there is currently a caveat that articulated parts must be be
  5 KB (763 words) - 09:45, 11 June 2023
• NML:Spriteset
  * For vehicles, the same as above is possible. However, to facilitate the common case of having multipl * Features not mentioned here have no use for sprite sets, as such they are not supported by NML.
  2 KB (321 words) - 15:04, 1 November 2014
• Action3/Canals
  ...feature this action 3 associates graphics with. There must be as many IDs as &lt;n-id&gt; specifies ...he following ones are for sloped rivers where slopes follow the same order as for id5 (river slopes).
  3 KB (434 words) - 22:04, 2 December 2011
• Callback: Decide input and output cargo types
  .... (A failed callback terminates the list, too.) The same limitations apply as for callback 14A: industry tiles aren't yet placed, and some industry varia In both cases return FFh as the last element to terminate the lists.
  2 KB (269 words) - 12:09, 4 November 2018
• ObjectLabels
  # To keep the numbers more manageable, the classes are as generic as possible. |STRU||Structures||Multitile engineered objects that don't quite fit in as industries, houses or stations - dams etc.
  4 KB (615 words) - 20:42, 11 August 2020
• GRFResourceManagement
  ...lable resources, check whether certain IDs are available, and/or mark them as reserved. Then, an action 6 will enter the actual values in the appropriate ...vated and be shown with an orange colour in the GRF Status Window, as well as a message indicating the type of resource that was not available. Note that
  7 KB (1,069 words) - 13:45, 13 February 2012
• VariationalAction2/Industry Tiles
  |41||B||{{ottdp|0.6|2.5}}||Ground type, the same as variable 81 for [[VarAction2Canals|canals]] ...|0.6|2.5}}||The tile is an industry tile, and belongs to the same industry as the current one
  5 KB (864 words) - 13:10, 1 April 2012
• NML:Graphic files
  ...valid palette. You can chose either the default (DOS) palette (recommended as it contains a few more colours) or the legacy (windows) palette.
  980 bytes (139 words) - 15:12, 16 October 2015

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