engine_override grf

[Eddy Arfik]

I'm trying to make a grf using the engine_override command to adjust capacity of wagons in another trainset, and having some trouble. When I use the code below, it only adjusts default capacity, refits are not changed

Code: Select all

item (FEAT_TRAINS, goods_van, 0x25)
	{
		property
		{
			cargo_capacity: 60;
			refittable_cargo_classes: bitmask(CC_EXPRESS, CC_PIECE_GOODS);
		}
	}

When I use this code, it adjusts all capacities correct, but the wagon changes to base-set graphics

Code: Select all

switch (FEAT_TRAINS, SELF, goods_wagon_capacity_switch, cargo_type_in_veh) 
	{
    return 60;
	}

item (FEAT_TRAINS, goods_wagon, 0x25) 
	{
		property 
		{
		cargo_capacity: 60;
		}
		graphics
		{
        cargo_capacity:     goods_wagon_capacity_switch;
		}
	}

Is there any way I can use the callback to change capacity while still using the sprites from the target grf?

[planetmaker]

Define the NewGRF by ID which you want to override: http://newgrf-specs.tt-wiki.net/wiki/NM ... er_NewGRFs . Then you need to know the IDs of the vehicles used in the set you want to override and re-define those properties you're interested in changing.
EDIT: but if you plan on changing callbacks, you need to re-define *all* callbacks of that vehicle. You cannot simply add one.

[Eddy Arfik]

I already know the ID's, and the overrides are working correctly for normal properties such as power, weight etc... It's only when I try to set a property using a callback that I lose the graphics defined by the target grf.

[frosch]

You are correct. There is no way to change a callback while keeping the graphics. The action 3 is replaced as a whole only.