Block offset

This topic is named from the game code.

While a name exists in the game code, it has not been otherwise used officially by Mojang.

Certain non-solid blocks, such as short grass, pointed dripstone, and some flowers do not have their textures or interaction boxes centered on blocks they are placed on, and are instead staggered in a pseudorandom manner. The offset of a block depends solely on its X and Z coordinates, and not the world seed. This means that, for example, a row of flowers at the same coordinates will always be staggered the same way between worlds, and this will not be changed by a player breaking or replacing them.

All blocks with an offset have their interaction box and/or texture translated in the X and Z axis. Some blocks such as short grass or the fern additionally have an offset in the Y axis for their textures only. The base X, Y, and Z offsets of a block are consistent between all blocks at a certain coordinate. However, some blocks (such as bamboo‌^{[Bedrock Edition only]} or pointed dripstone‌^{[Java Edition only]}) may use the base offset slightly differently than most blocks for block placement.

List of blocks subject to offset

The following is a list of blocks subject to an offset in game. Most blocks have their interaction box offset to match their texture being offset, but some do not.

Blocks subject to offset

Block	Interaction box XZ offset	Texture XZ offset	Interaction box Y offset	Texture Y offset
Short Grass Fern Short Dry Grass Tall Dry Grass	Yes	Yes	Bedrock Edition only	Yes
Mangrove Propagule Dandelion Golden Dandelion Torchflower Poppy Blue Orchid Allium Azure Bluet Tulips Oxeye Daisy Cornflower Wither Rose Lily of the Valley Bamboo Sapling Bamboo Pointed Dripstone Sulfur Spike	Yes	Yes	No	No
Sunflower Lilac Rose Bush Peony Tall Grass Large Fern Pitcher Plant Warped Roots Nether Sprouts Crimson Roots Hanging Roots	Bedrock Edition only	Yes	No	No
Coral Fans Dead Coral Fans	Bedrock Edition only	Bedrock Edition only	No	No
Coral Dead Coral	Bedrock Edition only	No[note 1]	No	No
Tall Seagrass	No	Java Edition only	No	No
Small Dripleaf	No	Java Edition only	No	Java Edition only

Effects of block offset on textures and hitboxes

In Java Edition, X and Z offsets are added to the coordinates of the center of the block to determine the new center of the texture or hitbox. In Bedrock Edition, X and Z offsets are used differently depending on the block. On both versions, the Y offset is directly added to the Y coordinate of the block to determine what Y level a texture will start. A Y offset will always be negative or zero, meaning a block's texture or interaction box may be translated downwards but never upwards.

Calculation of block offset

These calculations are exclusively for Java Edition. The algorithm used in Bedrock Edition is unknown.

X and Z offset

The following algorithm is used to calculate X and Z offsets of blocks in Java Edition (except for pointed dripstone and sulfur spikes), given a block's X and Z coordinates.^[1] Note that two's compliment arithmetic while treating all integers as signed 64 bit numbers must be used for correct results.^{[note 2]}

temp1 = (0x2FC20F * x) XOR (0x6EBFFF5 * z)
temp2 = (0x285B825 * temp1 * temp1) + (0x000B * temp1)
x_offset = (((temp2 >> 16) AND 0xF) / 15.0 - 0.5) * 0.5
z_offset = (((temp2 >> 24) AND 0xF) / 15.0 - 0.5) * 0.5

The X and Z offsets of pointed dripstone and sulfur spikes are given by calculating the x_offset and z_offset above, and clamping the values between -0.125 and 0.125. All other blocks have their X and Z offsets clamped between -0.25 and 0.25.^{[note 3]}

Y offset

The Y offset in Java Edition depends solely on the X and Z coordinates of a block and the block type. For all blocks with a Y offset besides small dripleaf, the Y offset is given by (using the variable temp2 from above):^[1]

y_offset = (((temp2 >> 20) AND 0xF) / 15.0 - 1.0) * 0.2

The Y offset for small dripleaf is half as much as the Y offset for other blocks at the same coordinates.

Calculator

Block offset calculators

	X	0
	Z	0
	Max offset	1 0.25 0.125-0.25-0.25-0.2
	X offset	-0.2500
	Z offset	-0.2500
	Y offset	-0.2000
	Y offset (dripleaf)	-0.1000

Notes

References