[kovarex] [0.17.75] Crash placing modified rail wagons

[Muppet9010]

I was placing some modified locamotives and cargo wagons in editor mode and the game crashed. They were being placed in a line using the auto connect placement feature. I placed into a train from front heading backwards a loco, wagon and clicked to place a second loco when it happened. I saw the 2nd loco appear in the game and the ghost marker then appeared between the 2nd (back) loco and the cargo wagon when the error occured.

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The modified wagon entity prototype values were:

Code: Select all

local smallLoco = factorioUtil.table.deepcopy(data.raw.locomotive.locomotive)
smallLoco.name = "small_locomotive"
smallLoco.minable.result = "small_locomotive"
smallLoco.collision_box = {{-0.6, -0.7}, {0.6, 0.7}}
smallLoco.selection_box = {{-1, -0.9}, {1, 0.9}}
smallLoco.vertical_selection_shift = -0.5
smallLoco.connection_distance = 2
smallLoco.joint_distance = 1

local smallCargoWagon = factorioUtil.table.deepcopy(data.raw["cargo-wagon"]["cargo-wagon"])
smallCargoWagon.name = "small_cargo_wagon"
smallCargoWagon.minable.result = "small_cargo_wagon"
smallCargoWagon.collision_box = {{-0.6, -1.25}, {0.6, 1.25}}
smallCargoWagon.selection_box = {{-1, -1.4}, {1, 1.4}}
smallCargoWagon.vertical_selection_shift = -0.5
smallCargoWagon.connection_distance = 2
smallCargoWagon.joint_distance = 2

To reproduce

In 0.17.75
Load the mod zip attached: small_trains_17.0.0.zip
Load the save attached: _small loco test a.zip
In editor place a small_locomotive on the horizontal track with it snapping to the station.
Place a small_cargo_wagon behind it, snapping in place.
Place another small_locomotive behind the cargo wagon, snapping to it.
Game errors.

[Muppet9010]

from antidotal experience this seems to be related to the selection boxes, as if I make them smaller the crash doesn't occur.

[kovarex]

I can't load the mod.

It is generally not a good idea to try to change the size of the rolling stocks too much.

[Muppet9010]

I had forgotten this was logged tbh. I gave up on this mod idea shortly after posting this bug due to other game engine limitations relating to non default sized wagons. I never ported the POC mod code in to .18 so no idea if the bug still occurs, but seems pretty pointless now given the wider context.

[Muppet9010]

Ended up trying this mod concept again and I no longer see an issue with selection boxes that touch/overlap when on corners.
So guess the core issue was fixed in the past 7 months