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Custom Glass

beginner
easy
experimental
Custom Glass

FORMAT VERSION 1.21.70

This example requires basic knowledge of blocks to understand. Check out the blocks guide before starting.

EXPERIMENTAL

Block culling rule conditions are experimental and require Upcoming Creator Features to be enabled.

Making glass blocks may seem like a simple task, however when you first try your block may appear opaque. This page will show you how to use material instances to allow texture translucency and culling rules to hide unwanted block faces.

By the end you should be able to create something like this!

A collection of custom glass blocks

Block Model ​

Vanilla block models cannot have culling rules applied. Therefore, we need to create our own full block model in order for our glass to appear correctly.

Custom Glass Model JSON
json
{
    "format_version": "1.21.80",
    "minecraft:geometry": [
        {
            "description": {
                "identifier": "geometry.custom_glass",
                "texture_width": 16,
                "texture_height": 16
            },
            "bones": [
                {
                    "name": "glass",
                    "pivot": [0, 0, 0],
                    "cubes": [
                        {
                            "origin": [-8, 0, -8],
                            "size": [16, 16, 16],
                            "uv": {
                                "north": { "uv": [0, 0], "uv_size": [16, 16] },
                                "east": { "uv": [0, 0], "uv_size": [16, 16] },
                                "south": { "uv": [0, 0], "uv_size": [16, 16] },
                                "west": { "uv": [0, 0], "uv_size": [16, 16] },
                                "up": { "uv": [16, 16], "uv_size": [-16, -16] },
                                "down": { "uv": [16, 16], "uv_size": [-16, -16] }
                            }
                        }
                    ]
                }
            ]
        }
    ]
}

Initial Block JSON ​

BP/blocks/custom_glass.json
json
{
    "format_version": "1.21.70",
    "minecraft:block": {
        "description": {
            "identifier": "wiki:custom_glass",
            "menu_category": {
                "category": "construction",
                "group": "minecraft:itemGroup.name.glass"
            }
        },
        "components": {
            "minecraft:light_dampening": 0, // Don't block any light (this is set to 15 for Tinted Glass)
            "minecraft:loot": "loot_tables/empty.json", // Don't drop without Silk Touch
            "minecraft:geometry": {
                "identifier": "geometry.custom_glass" // A custom full block model that we can apply culling to later
            },
            "minecraft:material_instances": {
                "*": {
                    "texture": "wiki:custom_glass", // Texture shortname defined in terrain_texture.json
                    "render_method": "blend" // Allow translucency
                }
            }
        }
    }
}

Applying Sounds ​

RP/blocks.json
json
{
    "format_version": "1.21.40",
    "wiki:custom_glass": {
        "sound": "glass"
    }
}

Glass Block Culling ​

Currently, our custom glass doesn't have any culling applied.

This means that, when multiple glass blocks are next to each other, there will be faces separating them:

A collection of custom glass blocks without culling

Block Culling JSON ​

Custom Glass Culling Rules JSON
RP/block_culling/custom_glass.json
json
{
    "format_version": "1.21.80",
    "minecraft:block_culling_rules": {
        "description": {
            "identifier": "wiki:culling.custom_glass"
        },
        "rules": [
            {
                "condition": "same_block",
                "direction": "down",
                "geometry_part": {
                    "bone": "glass",
                    "cube": 0,
                    "face": "down"
                }
            },
            {
                "condition": "same_block",
                "direction": "up",
                "geometry_part": {
                    "bone": "glass",
                    "cube": 0,
                    "face": "up"
                }
            },
            {
                "condition": "same_block",
                "direction": "north",
                "geometry_part": {
                    "bone": "glass",
                    "cube": 0,
                    "face": "north"
                }
            },
            {
                "condition": "same_block",
                "direction": "south",
                "geometry_part": {
                    "bone": "glass",
                    "cube": 0,
                    "face": "south"
                }
            },
            {
                "condition": "same_block",
                "direction": "west",
                "geometry_part": {
                    "bone": "glass",
                    "cube": 0,
                    "face": "west"
                }
            },
            {
                "condition": "same_block",
                "direction": "east",
                "geometry_part": {
                    "bone": "glass",
                    "cube": 0,
                    "face": "east"
                }
            }
        ]
    }
}

Applying Culling Rules ​

minecraft:block > components
json
"minecraft:geometry": {
    "identifier": "geometry.custom_glass",
    "culling": "wiki:culling.custom_glass"
},

Contributors

Edit Custom Glass on GitHub

Text and image content on this page is licensed under the Creative Commons Attribution 4.0 International License

Code samples on this page are licensed under the MIT License