Alpha, Subject to changes

Summary:

A temperature mod for Terrafirmacraft, A complex temperature system that can also be extended to non player entities.

Keeping Warm:

Seeking sunlight
Sheltering from wind
Heat sources such as fire, TFC sources are also supported
Heated items such as ingots, pots, etc.
Insulation or clothing

Keeping Cool:

Seeking shade
Seeking wind
Swimming
Contact with cold blocks such as ice
Insulation or clothing

Interiors:

Dynamic flood fill system allowing for any structure
Thermodynamic based model, Internal volume requires energy and time to warm
Block porosity allows for functional differing block states, Eg. trapdoor as windows.

Data Driven:

Entity Temperature Data Map: data/thermia/data_maps/entity_type/entity_temperatures.json

Entity Temperature is the primary data map that you'll encounter and is the method to add or remove the temperature system to entities. It has the following data:

max_entity_temperature: Maximum temperature or climate for an entity.
min_entity_temperature: Minimum temperature or climate for an entity.
is_mob: This is for deciding if the entity receives the simple or complex player model.
is_tamed: If the entity requires taming for the temperature system to enable.

Block Temperature Data Map: data/thermia/data_maps/block/block_temperature.json

Block Temperature is another primary data map. It's what tells thermia what block has what temperature and if it's hot and radiative or cold and conductive. It has the following data:

temperature: Temperature of the block or default temperature if it has blockstates, If hasTFCHeat is true this must be 0.
search_cap: How many should thermia look for and save in each nearby block search.
has_tfc_heat: If the block has TFC's heat mechanic, If this is true the temperature must be 0.
is_radiative: If this block should be treated like a radiation source. If this is false it's treated as a contact source, Eg. Ice.
is_home_block: Deprecated, Ignore it.
state_temps: This is more complex. This allows for specific blockstates to have different temperatures, The bloomery for example has "state_temps":{"lit=true":1200}. With a temperature value of 0, this means the bloomery will be 0 temperature until it's blockstate lit = true.

Fluid Temperature Data Map: data/thermia/data_maps/fluid/fluid_temperature.json

Much like Block Temperature, This handles fluid temperature. It will also allow you to define radiative temperatures for blocks containing these fluids such as tanks. Note this data map does not have special block state handling. It has the following data:

temperature: Temperature of the fluid.
search_cap: How many should thermia look for and save in each nearby block search.
is_radiative: If this block should be treated like a radiation source. If this is false it's treated as a submersion source, Eg. Water.

Block Porosity Data Map data/thermia/data_maps/block/block_porosity.json

The Block Porosity Data Map is for defining the leakiness of a block for interiors. As the interior system only uses Block Porosity and isSolidRender to determine boundaries, Block Porosity also acts as a white list to allow non solid blocks as walls or edges. It should be noted that porosity is inverted, so a solid block would be near 1.0 and an open block would be near 0.0. It has the following data:

state_porosity: Much like the state_temps value for Block Temperature, This is a complex entry for allowing a block with multiple block state values to have differing porosity or leakiness values. Eg. The trapdoors entry: "state_porosity":{"open=false":0.1,"open=true": 0.95}. As with trapdoors their vertical position is considered "open" however closed for the purpose of a window.
default_porosity: The default porosity if none of the state_porosity values apply.

Item Insulation Data Map: data/thermia/data_maps/item/item_insulation.json

Item insulation is a key part of Thermia's thermal system. It isolates you from the environment slowing or even stopping environmental temperature change. There are 4 attributes to the clothing system. It has the following data:

conductionProtection: Conduction does double duty, First and foremost it helps protect against contact sources like cold blocks. It also helps dampen the pull of environmental temperature. Must be within -1 to 1.
radiationProtection: Radiation protects from radiative sources like lava, fire or the sun. This helps with the sun on a hot day or when working by a forge. Must be within -1 to 1.
convectionProtection: This guards against the wind or moving air, Helping keeping the entity warm. Must be within -1 to 1.
rainProtection: Rain protection is fairly simple, It's a simple limit to how wet you can get while in the rain. Must be within 0 to 1.

TFC Thermia