Road Vehicles - change wagon length?

[andythenorth]

I would like to reduce the lengths of some road vehicles to improve the appearance of articulated vehicles.

Can I use the wagon length callback (11) to fix situations such as displayed by the screenshots below?

reduce_road_vehicle_width_2.png (7.22 KiB) Viewed 1894 times

reduce_road_vehicle_width.png (8.89 KiB) Viewed 1897 times

cheers,

Andy

[michael blunck]

I would like to reduce the lengths of some road vehicles [...] Can I use the wagon length callback (11) [?]

Yes, should be possible.

regards
Michael

[FooBar]

Here's what I use for trams. For road vehicles it's basically the same except for the vehicle flag in the action 0. Please see file attached below.

[DJ Nekkid]

Code: Select all

action1
action2 cID A0
-1 * 0  02 01 A1 81 0C 00 FF 01          // callback, 1 case
                             02 80 11 11 // 02 shorter in CB11
                             A0 00       // Default cID
action3

that made sense?

[andythenorth]

[
that made sense?

Yes, makes sense, I haven't tried it yet, but I follow the logic ok.

cheers,

Andy

[DJ Nekkid]

hehe, callbacks are a b**** to understand, until you suddenly get an "eureka" ... then you understand most of them

[andythenorth]

EDIT: Nothing to see here, the behaviour described below doesn't persist through a save / reload of a game. I'm not looking for any answers - but I've left the post intact in case anyone searches for a similar issue in future.


--
Nothing says 'Christmas day' like a varaction 2 chain right?

I have some RV code (below) which is 'correct' but should not provide what I understand to be the varaction 2 / action 2 chain that I need, but does gives me the result I need.

My intention is to reduce vehicle length by the same amount for all cargos. This code appears to provide my intended wagon length irrespective of which cargo the vehicle is refitted to. As I read it though, cargo ID AA for the cargoes should not be used (for cargos where an ID is defined), so callback 11 shouldn't be getting handled (which would leave vehicle length unchanged).

Quirk, or expected behaviour? If this is reliable it means I don't have to construct the 31 different varaction 2s I thought I'd need to set vehicle length. If it's not reliable, obviously I'll sack it in favour of the correct method.

(I wondered if the default cargo ID always used at some point in the process of building the vehicle?)

cheers,

Andy

Code: Select all

 [...many regular action 2s with IDs 00 - 17]
 362 * 14	 02 01 AA  // handle callbacks
                 81 0C 00 FF // check variable 0C
                 01 // range
                  04 80 11 11 // vehicle length callback
                 02 00
  363 * 106	 03 01 01 00 // Action 3
    20 // Number of different cargo types to support 
    00 00 00 // 
    01 01 00
    02 02 00
    03 03 00
    04 04 00 
    05 05 00
    06 06 00
    07 07 00
    08 08 00
	  09 09 00
	  0A 0A 00
	  0B 0B 00
	  0C 0C 00
	  0D 0C 00
	  0E 0E 00
	  0F 03 00
	  10 03 00
	  11 11 00
	  12 05 00
	  13 13 00 
	  14 05 00
	  15 15 00
	  16 03 00
	  17 17 00
	  18 18 00
	  19 03 00
	  1A 1A 00
	  1B 06 00
	  1C 0A 00
	  1D 06 00
	  1E 07 00
	  1F 0A 00 
	  AA 00 // default   

[DJ Nekkid]

then you either need 17 lines of "shorter" code, or make the vehicle itself shorter in the action0, and then just make the "lead vehicle" longer?
if you use "shorter code" on each attached vehicle, you can reuse it's cID to make it easier.

[andythenorth]

then you either need 17 lines of "shorter" code, or make the vehicle itself shorter in the action0, and then just make the "lead vehicle" longer?

Ach, nice idea, but RVs don't support prop 21 in an action 0. I tried it anyway, but unsurprisingly, and with it's usual beautiful accuracy nfo-renum was unhappy with it - rightly so because OpenTTD crashed when I tested the grf

Possibly there is a property that can be set for RV length, but if so I missed it in the documentation.

In this case, I need to provide a livery refit cycle for each cargo anyway, so I'll be writing varaction 2s to deal with the callback for that. It's only one line extra per varaction 2 to set the vehicle length.

cheers,

Andy

[DJ Nekkid]

When i checked the documentation did it seem like there is no "built in" support for shorter vehicles as you stated, so i'd just use the code i suggested first.

Code: Select all

a number of Action 1's
-1 * 0  02 01 <1st cid> 01 \w<from action1> \w<from action1>
-1 * 0  02 01 <1st cid> 81 0C 00 FF 01  04 80  11 11  <1st id>

-1 * 0  02 01 <2nd cid> 01 \w<from action1> \w<from action1>
-1 * 0  02 01 <2nd cid> 81 0C 00 FF 01  04 80  11 11  <2nd id>

-1 * 0  02 01 <3rd cid> 01 \w<from action1> \w<from action1>
-1 * 0  02 01 <3rd cid> 81 0C 00 FF 01  04 80  11 11  <3rd id>

etc

that phat action3

[andythenorth]

When i checked the documentation did it seem like there is no "built in" support for shorter vehicles as you stated, so i'd just use the code i suggested first.

Well thanks DJ, but I found another way. This code sets wagon length, and allows multiple refits on the same cargo (wheeled trailers or sleds on skis). I use var 47 to decide which 'final' action 2 cargo ID to use.
I hope that using var 47 will also make it easier to:
- check classes in future for compatibility with industry sets
- use different graphics according to capacity (these trailers will increase capacity over time)

cheers,

Andy

magic of variable 47.png (10.61 KiB) Viewed 1344 times

Code: Select all

[...action 0...]
[...some text strings...]
[...real sprites...]
[...regular action 2s...]
 643 * 18	 02 01 CE  // choose sled sprites according to cargo
                 81 47 00 FF // var 47 in format ccccwwtt where I want tt 
                 02 // range
                  21 00 01 01 // 
                  26 00 06 06 // 
                  // lots more cargos to add here...
                 25 00 // default 
  644 * 18	 02 01 CD  // choose wheeled trailer sprites according to cargo
                 81 47 00 FF // var 47 in format ccccwwtt where I want tt 
                 02 // range
                  01 00 01 01 // 
                  06 00 06 06 // 
                  // lots more cargos to add here
                 05 00 // default 
  645 * 18	 02 01 CC  // set refit text strings
                 81 F2 00 FF //
                 02 // range
                  00 80 00 00 
                  01 80 01 01 
                 FF 80 // end callback chain
  646 * 18	 02 01 CB  // choose sprites according to refit
                 81 F2 00 FF //
                 02 // range
                  CD 00 00 00 // wheeled trailers 
                  CE 00 01 01 // sleds
                 05 00 // default 
  647 * 18	 02 01 C0  // handle callbacks
                 81 0C 00 FF //
                 02 // range
                  04 80 11 11 // vehicle length CB
                  CC 00 19 19 // text suffix CB 
                 CB 00 // graphics
  648 * 49	 03 01 01 08 // Action 3
    00 // Number of different cargo types to support (!! reminder: use hex) 
	  C0 00 // default

[DJ Nekkid]

same s***, different wrapping