Custom Tree

experimental

Creating your own tree with decaying leaves are possible. Follow this tutorial and you'll have your own in no time!

What you will do

  • Features:

    • Decaying leaves
    • Tree Feature compatable
      
    • If leaves were broken using shears, they will drop the block
    • Leaves doesn't decay if placed by player
    • Logs are strippable and rotatable
    • Stripping logs is compatible with tools from other Add-Ons (if they have the "tag:minecraft:is_axe":{} component)
    • Saplings can be bonemealed and grow the tree (with structures)
  • Issues:

    • If you made a structure with these blocks, it will crash the game when generated using features. Minecraft structure ticking block bug.

TIP

To make your leaves decay you need basic understanding on block permutations and block properties.

Making Decaying Leaves

You will notice straight away that our custom leaves have a long list to search for a vanilla log/custom log by its block tag, although the code example uses the custom logs for this tutorial. The value is 4 and this method is used to search for the nearest log in a circular radius.

alternative text

Our custom leaves disables ticking when placed by the player which doesn't make the leaves decay and this removes the requirements for another duplicate leave block.

Code
BP/blocks/custom_leaves.jsonCopy
{
    "format_version": "1.16.100",
    "minecraft:block": {
        "description": {
            "identifier": "wiki:custom_leaves",
            "properties": {
                "wiki:decay_tier": [
                    4,
                    3,
                    2,
                    1,
                    0
                ], //the distance in blocks to find the log
                "wiki:not_decay": [
                    false,
                    true
                ], //used when placed by the player or with features
                "wiki:solid": [
                    false,
                    true
                ] //optional; makes the leaves non-transparent when surrounded
            }
        },
        "events": {
            "wiki:on_destroyed": { //defines the loot for the tool
                "sequence": [
                    {
                        "condition": "query.get_equipped_item_name == 'shears'",
                        "spawn_loot": {
                            "table": "loot_tables/blocks/custom_leaves_block.json"
                        }
                    },
                    {
                        "condition": "query.get_equipped_item_name != 'shears'",
                        "spawn_loot": {
                            "table": "loot_tables/blocks/custom_leaves_loot.json"
                        }
                    }
                ]
            },
            "check": { //checks for the log
                "sequence": [
                    {
                        "condition": "q.block_property('wiki:not_decay') == false",
                        "set_block_property": {
                            "wiki:decay_tier": "(q.block_neighbor_has_any_tag(0,0,-1,'wiki:custom_log') || q.block_neighbor_has_any_tag(0,0,1,'wiki:custom_log') || q.block_neighbor_has_any_tag(-1,0,0,'wiki:custom_log') || q.block_neighbor_has_any_tag(1,0,0,'wiki:custom_log') || q.block_neighbor_has_any_tag(0,-1,0,'wiki:custom_log') || q.block_neighbor_has_any_tag(0,1,0,'wiki:custom_log')) ? 4 : ((q.block_neighbor_has_any_tag(0,0,-1,'wiki:decay_tier_4') || q.block_neighbor_has_any_tag(0,0,1,'wiki:decay_tier_4') || q.block_neighbor_has_any_tag(-1,0,0,'wiki:decay_tier_4') || q.block_neighbor_has_any_tag(1,0,0,'wiki:decay_tier_4') || q.block_neighbor_has_any_tag(0,-1,0,'wiki:decay_tier_4') || q.block_neighbor_has_any_tag(0,1,0,'wiki:decay_tier_4')) ? 3 : ( (q.block_neighbor_has_any_tag(0,0,-1,'wiki:decay_tier_3') || q.block_neighbor_has_any_tag(0,0,1,'wiki:decay_tier_3 ') || q.block_neighbor_has_any_tag(-1,0,0,'wiki:decay_tier_3') || q.block_neighbor_has_any_tag(1,0,0,'wiki:decay_tier_3') || q.block_neighbor_has_any_tag(0,-1,0,'wiki:decay_tier_3') || q.block_neighbor_has_any_tag(0,1,0,'wiki:decay_tier_3')) ? 2 : ( (q.block_neighbor_has_any_tag(0,0,-1,'wiki:decay_tier_2') || q.block_neighbor_has_any_tag(0,0,1,'wiki:decay_tier_2') || q.block_neighbor_has_any_tag(-1,0,0,'wiki:decay_tier_2') || q.block_neighbor_has_any_tag(1,0,0,'wiki:decay_tier_2') || q.block_neighbor_has_any_tag(0,-1,0,'wiki:decay_tier_2') || q.block_neighbor_has_any_tag(0,1,0,'wiki:decay_tier_2')) ? 1 : 0 ) ) )"
                        }
                    },
                    {
                        "set_block_property": {
                            "wiki:solid": "q.block_neighbor_has_any_tag(0,0,-1,'wiki:custom_log','stone','wiki:custom_leaves') && q.block_neighbor_has_any_tag(0,0,1,'wiki:custom_log','stone','wiki:custom_leaves') && q.block_neighbor_has_any_tag(0,1,0,'wiki:custom_log','stone','wiki:custom_leaves') && q.block_neighbor_has_any_tag(0,-1,0,'wiki:custom_log','stone','wiki:custom_leaves') && q.block_neighbor_has_any_tag(-1,0,0,'wiki:custom_log','stone','wiki:custom_leaves') && q.block_neighbor_has_any_tag(1,0,0,'wiki:custom_log','stone','wiki:custom_leaves')"
                        }
                    }
                ]
            },
            "wiki:stop_decay": { //when placed
                "set_block_property": {
                    "wiki:not_decay": true
                }
            },
            "wiki:decay": { //when decayed
                "die": {}
            }
        },
        "permutations": [ //nothing great here, just the stages.
            {
                "condition": "query.block_property('wiki:decay_tier') == 0",
                "components": {
                    "minecraft:ticking": {
                        "looping": true,
                        "range": [
                            0,
                            0
                        ],
                        "on_tick": {
                            "event": "check"
                        }
                    },
                    "minecraft:unit_cube": {},
                    "tag:wiki:decay_tier_0": {},
                    "minecraft:random_ticking": {
                        "on_tick": {
                            "event": "wiki:decay"
                        }
                    }
                }
            },
            {
                "condition": "query.block_property('wiki:decay_tier') == 1",
                "components": {
                    "minecraft:ticking": {
                        "looping": true,
                        "range": [
                            0,
                            0
                        ],
                        "on_tick": {
                            "event": "check"
                        }
                    },
                    "minecraft:unit_cube": {},
                    "tag:wiki:decay_tier_1": {}
                }
            },
            {
                "condition": "query.block_property('wiki:decay_tier') == 2",
                "components": {
                    "minecraft:ticking": {
                        "looping": true,
                        "range": [
                            0,
                            0
                        ],
                        "on_tick": {
                            "event": "check"
                        }
                    },
                    "minecraft:unit_cube": {},
                    "tag:wiki:decay_tier_2": {}
                }
            },
            {
                "condition": "query.block_property('wiki:decay_tier') == 3",
                "components": {
                    "minecraft:ticking": {
                        "looping": true,
                        "range": [
                            0,
                            0
                        ],
                        "on_tick": {
                            "event": "check"
                        }
                    },
                    "minecraft:unit_cube": {},
                    "tag:wiki:decay_tier_3": {}
                }
            },
            {
                "condition": "query.block_property('wiki:decay_tier') == 4",
                "components": {
                    "minecraft:ticking": {
                        "looping": true,
                        "range": [
                            0,
                            0
                        ],
                        "on_tick": {
                            "event": "check"
                        }
                    },
                    "minecraft:unit_cube": {},
                    "tag:wiki:decay_tier_4": {}
                }
            },
            {
                "condition": "query.block_property('wiki:solid') == true",
                "components": {
                    "minecraft:material_instances": {
                        "*": {
                            "texture": "custom_leaves",
                            "render_method": "opaque"
                        }
                    }
                }
            }
        ],
        "components": { //main components
            "minecraft:creative_category": {
                "group": "itemGroup.name.leaves",
                "category": "nature"
            },
            "minecraft:on_player_placing": {
                "event": "wiki:stop_decay",
                "target": "self"
            },
            "minecraft:on_player_destroyed": {
                "event": "wiki:on_destroyed"
                //Triggers event that spawns different loot
            },
            "minecraft:ticking": {
                "looping": true,
                "range": [
                    0,
                    0
                ],
                "on_tick": {
                    "event": "check"
                }
            }, //we need both of these to work with world generation
            "minecraft:random_ticking": {
                "on_tick": {
                    "event": "check",
                    "target": "block"
                }
            },
            "tag:wiki:custom_leaves": {},
            "minecraft:breathability": "air",
            "minecraft:destroy_time": 0.3,
            "minecraft:map_color": "#FFFFFF",
            "minecraft:explosion_resistance": 1.0,
            "minecraft:block_light_absorption": 0.0,
            "minecraft:block_light_emission": 0.0,
            "minecraft:material_instances": {
                "*": {
                    "texture": "custom_leaves",
                    "render_method": "blend",
                    "ambient_occlusion": true,
                    "face_dimming": true
                }
            }
        }
    }
}
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Making Custom Log

Code
BP/blocks/custom_log.jsonCopy
{
    "format_version": "1.16.100",
    "minecraft:block": {
        "description": {
            "identifier": "wiki:custom_log",
            "properties": {
                "wiki:facing_direction": [
                    0,
                    1,
                    2
                ]
            }
            //Log direction properties
        },
        "permutations": [
            {
                "condition": "query.block_property('wiki:facing_direction') == 0",
                //If query.block_property('wiki:facing_direction') == 0 sets no rotation and on_interact component
                "components": {
                    "minecraft:rotation": [
                        0,
                        0,
                        0
                    ],
                    "minecraft:on_interact": {
                        "condition": "query.equipped_item_any_tag('slot.weapon.mainhand', 'minecraft:is_axe')",
                        "event": "wiki:become_stripped_0"
                        //Event sets custom stripped log with no rotation
                    }
                }
            },
            {
                "condition": "query.block_property('wiki:facing_direction') == 1",
                //If query.block_property('wiki:facing_direction') == 1 sets rotation and on_interact component
                "components": {
                    "minecraft:rotation": [
                        90,
                        0,
                        0
                    ],
                    "minecraft:on_interact": {
                        "condition": "query.equipped_item_any_tag('slot.weapon.mainhand', 'minecraft:is_axe')",
                        "event": "wiki:become_stripped1"
                        //Event sets custom stripped log with rotation
                    }
                }
            },
            {
                "condition": "query.block_property('wiki:facing_direction') == 2",
                //If query.block_property('wiki:facing_direction') == 2 sets rotation and on_interact component
                "components": {
                    "minecraft:rotation": [
                        0,
                        0,
                        90
                    ],
                    "minecraft:on_interact": {
                        "condition": "query.equipped_item_any_tag('slot.weapon.mainhand', 'minecraft:is_axe')",
                        "event": "wiki:become_stripped2"
                        //Event sets custom stripped log with rotation
                    }
                }
            }
        ],
        "components": {
            "tag:wiki:custom_log": {},
            "minecraft:creative_category": {
                "category": "nature",
                "group": "itemGroup.name.log"
            },
            "minecraft:material_instances": {
                "*": {
                    "texture": "custom_log",
                    "render_method": "opaque"
                },
                "ends": {
                    "texture": "custom_log_top",
                    "render_method": "opaque"
                },
                "up": "ends",
                "down": "ends"
                //Sets different textures for sides and top/bottom of log
            },
            "minecraft:loot": "loot_tables/blocks/custom_log_block.json",
            //Due to some bugs you need to add this component and loot table
            "minecraft:destroy_time": 1.0,
            "minecraft:unit_cube": {},
            "minecraft:on_player_placing": {
                "event": "wiki:set_facing_direction"
            }
            //Sets log rotation on player placing
        },
        "events": {
            "wiki:set_facing_direction": {
                "set_block_property": {
                    "wiki:facing_direction": "math.floor( query.block_face / 2.0 )"
                }
            },
            //Sets block rotation
            "wiki:become_stripped_0": {
                "sequence": [
                    {
                        "run_command": {
                            "command": [
                                "setblock ~~~ wiki:custom_stripped_log",
                                "playsound hit.wood @a ~~~"
                            ]
                        }
                    },
                    //Sets custom stripped log with special rotation and plays sound
                    {
                        "damage": {
                            "type": "durability",
                            "amount": 1,
                            "target": "item"
                        }
                    }
                    //Damages axe of player who stripped the log
                ]
            },
            "wiki:become_stripped1": {
                "sequence": [
                    {
                        "run_command": {
                            "command": [
                                "structure load custom_stripped_log1 ~~~",
                                "playsound hit.wood @a ~~~"
                            ]
                        }
                    },
                    //Loads structure (custom stripped log with special rotation) and plays sound
                    {
                        "damage": {
                            "type": "durability",
                            "amount": 1,
                            "target": "item"
                        }
                    }
                    //Damages axe of player who stripped the log
                ]
            },
            "wiki:become_stripped2": {
                "sequence": [
                    {
                        "run_command": {
                            "command": [
                                "structure load custom_stripped_log2 ~~~",
                                "playsound hit.wood @a ~~~"
                            ]
                        }
                    },
                    //Loads structure (custom stripped log with special rotation) and plays sound
                    {
                        "damage": {
                            "type": "durability",
                            "amount": 1,
                            "target": "item"
                        }
                    }
                    //Damages axe of player who stripped the log
                ]
            }
        }
    }
}
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Making Stripped Log

Here all components are the same

Code
BP/blocks/custom_stripped_log.jsonCopy
{
	"format_version": "1.16.100",
	"minecraft:block": {
		"description": {
			"identifier": "wiki:custom_stripped_log",
			"properties": {
				"wiki:facing_direction": [0, 1, 2]
			}
		},
		"permutations": [
			{
				"condition": "query.block_property('wiki:facing_direction') == 0",
				"components": {
					"minecraft:rotation": [0, 0, 0]
				}
			},
			{
				"condition": "query.block_property('wiki:facing_direction') == 1",
				"components": {
					"minecraft:rotation": [90, 0, 0]
				}
			},
			{
				"condition": "query.block_property('wiki:facing_direction') == 2",
				"components": {
					"minecraft:rotation": [0, 0, 90]
				}
			}
		],
		"components": {
			"minecraft:creative_category": {
				"category": "nature",
				"group": "itemGroup.name.log"
			},
			"minecraft:material_instances": {
				"*": {
					"texture": "custom_stripped_log",
					"render_method": "opaque"
				},
				"ends": {
					"texture": "custom_stripped_log_top",
					"render_method": "opaque"
				},
				"up": "ends",
				"down": "ends"
			},
			"minecraft:flammable": {
				"burn_odds": 50,
				"flame_odds": 25
			},
			"minecraft:loot": "loot_tables/blocks/custom_stripped_log_block.json",
			"minecraft:destroy_time": 1.0,
			"minecraft:unit_cube": {},
			"minecraft:on_player_placing": {
				"event": "wiki:set_facing_direction"
			}
		},
		"events": {
			"wiki:set_facing_direction": {
				"set_block_property": {
					"wiki:facing_direction": "math.floor( query.block_face / 2.0 )"
				}
			}
		}
	}
}
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Making Custom Sapling

For the sapling we will need structures of out tree to make the sapling semi-realistick. /place feature would be great.

Code
BP/blocks/custom_sapling.jsonCopy
{
    "format_version": "1.16.100",
    "minecraft:block": {
        "description": {
            "identifier": "wiki:custom_sapling",
            "properties": {
                "wiki:growing": [
                    0,
                    1,
                    2
                ]
            }
            //Properties of sapling growing
        },
        "permutations": [
            {
                "condition": "query.block_property('wiki:growing') == 0",
                "components": {
                    "minecraft:on_interact": {
                        "condition": "query.get_equipped_item_name('main_hand') == 'bone_meal'",
                        "event": "bone_meal_1"
                    },
                    "minecraft:ticking": {
                        "range": [
                            120,
                            180
                        ],
                        "on_tick": {
                            "event": "grow_1"
                        }
                    }
                }
            },
            {
                "condition": "query.block_property('wiki:growing') == 1",
                "components": {
                    "minecraft:on_interact": {
                        "condition": "query.get_equipped_item_name('main_hand') == 'bone_meal'",
                        "event": "bone_meal_2"
                    },
                    "minecraft:ticking": {
                        "range": [
                            120,
                            180
                        ],
                        "on_tick": {
                            "event": "grow_2"
                        }
                    }
                }
            },
            {
                "condition": "query.block_property('wiki:growing') == 2",
                "components": {
                    "minecraft:on_interact": {
                        "condition": "query.get_equipped_item_name('main_hand') == 'bone_meal'",
                        "event": "bone_meal_3"
                    },
                    "minecraft:ticking": {
                        "range": [
                            120,
                            180
                        ],
                        "on_tick": {
                            "event": "grow_3"
                        }
                    }
                }
            }
        ],
        "components": {
            "minecraft:material_instances": {
                "*": {
                    "texture": "custom_sapling",
                    "render_method": "alpha_test",
                    //Add this two components to remove shadow from this block:
                    "face_dimming": false,
                    "ambient_occlusion": false
                }
            },
            "minecraft:pick_collision": {
                "origin": [
                    -6,
                    0,
                    -6
                ],
                "size": [
                    12,
                    13,
                    12
                ]
            },
            "minecraft:loot": "loot_tables/blocks/custom_sapling.json",
            //Add loot component so it will drop sapling placer
            "minecraft:geometry": "geometry.custom_sapling",
            "minecraft:destroy_time": 0.01,
            "minecraft:entity_collision": false,
            "minecraft:breathability": "air",
            "minecraft:block_light_absorption": 0,
            "minecraft:placement_filter": {
                "conditions": [
                    {
                        "block_filter": [
                            "minecraft:dirt",
                            "minecraft:grass",
                            "minecraft:podzol"
                        ],
                        "allowed_faces": [
                            "up"
                        ]
                    }
                ]
            },
            //Allows to place block only on this blocks
            "minecraft:ticking": {
                "range": [
                    1,
                    1
                ],
                "on_tick": {
                    "event": "grow_0"
                }
            }
            //Starts to grow
        },
        "events": {
            "grow_0": {
                "set_block_property": {
                    "wiki:growing": 0
                }
                //Sets growing stage to 0
            },
            "grow_1": {
                "sequence": [
                    {
                        "run_command": {
                            "command": [
                                "particle minecraft:crop_growth_emitter ~~~"
                            ]
                        }
                        //Adds particles
                    },
                    {
                        "set_block_property": {
                            "wiki:growing": 1
                        }
                        //Sets growing stage to 1
                    }
                ]
            },
            "grow_2": {
                "sequence": [
                    {
                        "run_command": {
                            "command": [
                                "particle minecraft:crop_growth_emitter ~~~"
                            ]
                        }
                        //Adds particles
                    },
                    {
                        "set_block_property": {
                            "wiki:growing": 2
                            //Sets growing stage to 2
                        }
                    }
                ]
            },
            "grow_3": {
                "run_command": {
                    "command": [
                        "particle minecraft:crop_growth_emitter ~~~",
                        "structure load custom_tree ~-2 ~ ~-2"
                    ]
                }
                //Particles and structure loads. Magic!
            },
            "bone_meal_1": {
                "sequence": [
                    {
                        "decrement_stack": {}
                        //Clears item that were used to interact
                    },
                    {
                        "trigger": {
                            "event": "grow_1"
                        }
                        //Runs grow_1 event
                    }
                ]
            },
            "bone_meal_2": {
                "sequence": [
                    {
                        "decrement_stack": {}
                        //Clears item that were used to interact
                    },
                    {
                        "trigger": {
                            "event": "grow_2"
                        }
                        //Runs grow_2 event
                    }
                ]
            },
            "bone_meal_3": {
                "sequence": [
                    {
                        "decrement_stack": {}
                        //Clears item that were used to interact
                    },
                    {
                        "trigger": {
                            "event": "grow_3"
                        }
                        //Runs grow_3 event
                    }
                ]
            }
        }
    }
}
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Making Sapling Placer

Code
BP/items/custom_sapling_placer.jsonCopy
{
    "format_version": "1.16.100",
    "minecraft:item": {
        "description": {
            "identifier": "wiki:custom_sapling_placer",
            "category": "nature"
        },
        "components": {
            "minecraft:creative_category": {
                "parent": "itemGroup.name.sapling"
            },
            "minecraft:max_stack_size": 64,
            "minecraft:block_placer": {
                "block": "wiki:custom_sapling"
            },
            "minecraft:icon": {
                "texture": "custom_sapling_placer"
            }
        }
    }
}
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Making Loot Tables

Code
BP/loot_tables/blocks/custom_leaves_block.jsonCopy

This loot will spawn leaves block (when you breaak it using shears)

{
    "pools": [
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "wiki:custom_leaves",
                    "weight": 1
                }
            ]
        }
    ]
}
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Leaves default loot

BP/loot_tables/blocks/custom_leaves_loot.jsonCopy
{
    "pools": [
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "minecraft:apple",
                    "weight": 1
                },
                {
                    "type": "item",
                    "name": "wiki:custom_sapling_placer",
                    "weight": 5
                },
                {
                    "type": "empty",
                    //Nothing wil drop
                    "weight": 10
                }
            ]
        }
    ]
}
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This loot will spawn log block

BP/loot_tables/blocks/custom_log_block.jsonCopy
{
    "pools": [
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "wiki:custom_log",
                    "weight": 1
                }
            ]
        }
    ]
}
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This loot will spawn stripped log

BP/loot_tables/blocks/custom_stripped_log_block.jsonCopy
{
    "pools": [
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "wiki:custom_stripped_log",
                    "weight": 1
                }
            ]
        }
    ]
}
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This will spawn custom_sapling_placer

BP/loot_tables/blocks/custom_sapling_placer.jsonCopy
{
    "pools": [
        {
            "rolls": 1,
            "entries": [
                {
                    "type": "item",
                    "name": "wiki:custom_sapling_placer",
                    "weight": 1
                }
            ]
        }
    ]
}
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Making/Exporting Structures

Now you need to get custom_stripped_log1 and custom_stripped_log2 structures. Just export rotated stripped logs.

Build some trees too!

Tree Features

TIP

Tree Features are a really great way to get actual custom trees. You need some understanding on how they work but for this tutorial you can uses these templates.

Feature
BP/feature/custom_tree_feature.jsonCopy
{
    "format_version": "1.13.0",
    "minecraft:tree_feature": {
        "description": {
            "identifier": "wiki:custom_tree_feature"
        },
        "trunk": {
            "trunk_height": {
                "range_min": 6,
                "range_max": 10
            },
            "height_modifier": {
                "range_min": -2,
                "range_max": 4
            },
            "trunk_block": {
                "name": "minecraft:log",
                "states": {
                    "old_log_type": "spruce"
                }
            }
        },
        "spruce_canopy": {
            "lower_offset": {
                "range_min": 2,
                "range_max": 4
            },
            "upper_offset": {
                "range_min": 0,
                "range_max": 4
            },
            "max_radius": {
                "range_min": 3,
                "range_max": 5
            },
            "leaf_block": {
                "name": "wiki:custom_leaves"
            }
        },
        "base_block": [
            "minecraft:dirt",
            {
                "name": "minecraft:dirt",
                "states": {
                    "dirt_type": "coarse"
                }
            }
        ],
        "may_grow_on": [
            "minecraft:dirt",
            "minecraft:grass",
            "minecraft:podzol",
            "minecraft:dirt_with_roots",
            "minecraft:moss_block",
            {
                "name": "minecraft:dirt",
                "states": {
                    "dirt_type": "coarse"
                }
            },
            {
                "name": "minecraft:farmland",
                "states": {
                    "moisturized_amount": 0
                }
            },
            {
                "name": "minecraft:farmland",
                "states": {
                    "moisturized_amount": 1
                }
            },
            {
                "name": "minecraft:farmland",
                "states": {
                    "moisturized_amount": 2
                }
            },
            {
                "name": "minecraft:farmland",
                "states": {
                    "moisturized_amount": 3
                }
            },
            {
                "name": "minecraft:farmland",
                "states": {
                    "moisturized_amount": 4
                }
            },
            {
                "name": "minecraft:farmland",
                "states": {
                    "moisturized_amount": 5
                }
            },
            {
                "name": "minecraft:farmland",
                "states": {
                    "moisturized_amount": 6
                }
            },
            {
                "name": "minecraft:farmland",
                "states": {
                    "moisturized_amount": 7
                }
            }
        ],
        "may_replace": [
            "minecraft:air",
            {
                "name": "minecraft:leaves",
                "states": {
                    "old_leaf_type": "oak"
                }
            },
            {
                "name": "minecraft:leaves",
                "states": {
                    "old_leaf_type": "spruce"
                }
            },
            {
                "name": "minecraft:leaves",
                "states": {
                    "old_leaf_type": "birch"
                }
            },
            {
                "name": "minecraft:leaves",
                "states": {
                    "old_leaf_type": "jungle"
                }
            },
            {
                "name": "minecraft:leaves2",
                "states": {
                    "new_leaf_type": "acacia"
                }
            },
            {
                "name": "minecraft:leaves2",
                "states": {
                    "new_leaf_type": "dark_oak"
                }
            }
        ],
        "may_grow_through": [
            "minecraft:dirt",
            "minecraft:grass",
            {
                "name": "minecraft:dirt",
                "states": {
                    "dirt_type": "coarse"
                }
            }
        ]
    }
}
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Feature Rule
BP/feature_rules/custom_tree_feature_rule.jsonCopy
{
    "format_version": "1.13.0",
    "minecraft:feature_rules": {
        "description": {
            "identifier": "wiki:custom_tree_feature_rule",
            "places_feature": "wiki:custom_tree_feature"
        },
        "conditions": {
            "placement_pass": "surface_pass",
            "minecraft:biome_filter": [
                {
                    "test": "has_biome_tag",
                    "operator": "==",
                    "value": "taiga"
                },
                {
                    "test": "has_biome_tag",
                    "operator": "!=",
                    "value": "mega"
                }
            ]
        },
        "distribution": {
            "iterations": 1,
            "coordinate_eval_order": "zxy",
            "x": {
                "extent": [
                    0,
                    16
                ],
                "distribution": "uniform"
            },
            "y": "query.heightmap(variable.worldx, variable.worldz)",
            "z": {
                "extent": [
                    0,
                    16
                ],
                "distribution": "uniform"
            }
        }
    }
}
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Resource Pack (optional guide)

Now it is time to make a resource pack!

Make translations for blocks:

RP/texts/en_US.langCopy
tile.wiki:custom_log.name=Custom Log
tile.wiki:custom_leaves.name=Custom leaves
tile.wiki:custom_stripped_log.name=Custom Stripped Log
tile.wiki:custom_sapling.name=Custom Sapling
item.wiki:custom_sapling_placer=Custom Sapling
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Make terrain_texture.json and textures.

RP/textures/terrain_texture.jsonCopy
{
    "num_mip_levels": 4,
    "padding": 8,
    "resource_pack_name": "Parts of Custom Tree",
    "texture_data": {
        "custom_leaves": {
            "textures": "textures/blocks/leaves_oak"
        },
        "custom_log": {
            "textures": "textures/blocks/log_oak"
        },
        "custom_log_top": {
            "textures": "textures/blocks/log_oak_top"
        },
        "custom_stripped_log": {
            "textures": "textures/blocks/stripped_oak_log"
        },
        "custom_stripped_log_top": {
            "textures": "textures/blocks/stripped_oak_log_top"
        },
        "custom_sapling": {
            "textures": "textures/blocks/sapling_oak"
        }
    },
    "texture_name": "atlas.terrain"
}
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Make geometry for sapling:

RP/models/blocks/custom_sapling.geo.jsonCopy
{
	"format_version": "1.12.0",
	"minecraft:geometry": [
		{
			"description": {
				"identifier": "geometry.custom_sapling",
				"texture_width": 16,
				"texture_height": 16,
				"visible_bounds_width": 2,
				"visible_bounds_height": 2.5,
				"visible_bounds_offset": [0, 0.75, 0]
			},
			"bones": [
				{
					"name": "bb_main",
					"pivot": [0, 0, 0],
					"cubes": [
						{
							"origin": [-8, 0, 0],
							"size": [16, 16, 0],
							"pivot": [0, 0, 0],
							"rotation": [0, -45, 0],
							"uv": [0, 0]
						},
						{
							"origin": [-8, 0, 0],
							"size": [16, 16, 0],
							"pivot": [0, 0, 0],
							"rotation": [0, 45, 0],
							"uv": [0, 0]
						}
					]
				}
			]
		}
	]
}
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Make item_texture file

RP/textures/item_texture.jsonCopy
{
    "resource_pack_name": "Parts of Custom Tree",
    "texture_name": "atlas.items",
    "texture_data": {
        "custom_sapling_placer": {
            "textures": "textures/blocks/sapling_oak"
        }
    }
}
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Add sounds to blocks

RP/blocks.jsonCopy
{
    "format_version": [
        1,
        1,
        0
    ],
    "wiki:custom_leaves": {
        "sound": "grass"
    },
    "wiki:custom_log": {
        "sound": "wood"
    },
    "wiki:custom_stripped_log": {
        "sound": "wood"
    },
    "wiki:custom_sapling": {
        "sound": "grass"
    }
}
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Result

What you have created:

📁BP
📝manifest.json
🖼️pack_icon.png
📁blocks
📝custom_leaves.json
📝custom_log.json
📝custom_stripped_log.json
📝custom_sapling.json
📁features
📝custom_tree_feature.json
📁feature_rules
📝custom_tree_feature_rule.json
📁items
📝custom_sapling_placer.json
📁loot_tables
📁blocks
📝custom_leaves_block.json
📝custom_leaves_loot.json
📝custom_log_block.json
📝custom_stripped_log_block.json
📝custom_sapling_placer.json
📁structures
🏛custom_stripped_log1.mcstructure
🏛custom_stripped_log2.mcstructure
🏛custom_tree.mcstructure
📁RP
📝manifest.json
🖼️pack_icon.png
📝blocks.json
📁texts
🈵en_US.lang
📁textures
📝terrain_texture.json
📝item_texture.json
📁models
📁blocks
📝custom_sapling.geo.json

Download Example Pack

Template Pack to use in-game to get the idea.

TEMPLATE

Contributors

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