Spontaneous Explosions

{
    "format_version": "1.15.0",
    "minecraft:block": {
        "description": {
            "identifier": "namespace:block_name",
            "register_to_creative_menu": true,
            "creative_menu_tab": "construction"
        },

        "minecraft:block_data": [
            {
                "data_value": 0,
                "minecraft:block_model": {
                    "hitbox": "hitbox_model_file",
                    "collision": "collision_model_file",
                    "geometry": "block_geometry_file",
                    "inventory_model": "block_inventory_model_file",
                    "texture": "texture-id",
                    "carried_texture": "texture_id"
                }

            }
        ],
        "minecraft:sounds": {
            "place": "sound",
            "break": "sound",
            "step": "sound"
        },
        "minecraft:placement_logic": "block",
        "minecraft:waterlogged": true,
        "minecraft:transparent" : true,
        "minecraft:gravity": false,
        "minecraft:bouncy": {
            "value" : 0.5
        },
        "minecraft:climbable": false,
        "minecraft:sticky": {
            "value" : 0.3,
            "stick_to_wall": false,
            "restrict_jumping": false
        },
        "minecraft:fuel": {
            "burn_time": 1
        },
        "minecraft:block_types" : ["double"],
        "minecraft:loot": {
            "table": "loot_table"
        },
        "minecraft:destroy_time": {
            "value": 2.5
        },
        "minecraft:explosion_resistance": {
            "value": 15
        },
        "minecraft:friction": {
            "value": 0.1
        },
        "minecraft:map_color": {
            "color": "#000000"
        },
        "minecraft:block_light_absorbtion": {
            "value": 0
        },
        "minecraft:block_light_emmission": {
            "emission": 0
        }
        ]}
}

"minecraft:block_data"

"minecraft:sounds":

"minecraft:placement_logic":

Quote

This is where I feel like things get complicated.

placement logic defines...how the block is placed.

It refers to a separate file. This file would contain a bunch of tests. The tests would be thinsg like the direction the player is facing, what block they're currently selecting, whether or not you're pointing at the side of the block, ect...

With each test, you can define what happens if the test is true, or if it is false.

Test responses can only accept data values, the ones defined in your block file.

for example, if you had the block file defining a stair block, if ould contain the "block_data" array with each of the 24(I think) data values, each with it's own model.

Then you define a placement logic file that detects the players direction, and where on the block you're selecting(upper half, lower half) and set a data value accordingly.

 

"minecraft:waterlogged":  Determines whether or not the block can be waterlogged

accepts boolean

"minecraft:transparent": Determines whether or not the block is considered transparent by the game

accepts boolean

"minecraft:gravity": Determines whether or not the block will fall, like sand

accepts boolean

"minecraft:bouncy": Determines the bounciness of a block

accepts a decimal value

"minecraft:climbable": determines whether or not the block can be climbed

accepts boolean

"minecraft:sticky":

Quote

determines the stickiness  of the block.

parameters:

"value" determines how sticky it is(how much is slows you down when walked on)

"stick_to_wall" determines whether or not the stickiness is applied to the sides of the block

"restrict_jumping": determines whether or you will stick to the block and not be able to jump(like honey blocks)

This value could be used by soul sand to control is slow walking.

you could set the sticky to 1, have it not stick to walls, and not restrict jumping. 

Likewise, you could have all 3 true and get something like a honey block.

"minecraft:fuel": determines whether or not the block can be used as fuel.

accepts decimal value, determining how many items it can smelt.

"minecraft:block_types":

Quote

An array containing all block types this block has.

Example of a block type would be block_entity.

If a block has a block_entity type, it's block model must be an entity geometry file instead of a block geometry file.

In turn, it would be able to have animations.

In game examples of this type would be chests and banners.

If you set the type to 'double' it expects at least 2 block_data values, one defining the bottom block, and one defining the top.(by putting "type": "top" inside a data_value object, foe example)

Block types, in addition to the block_data, would be the equivalent of block_states on Java(kinda)