replaceDataValue is the variation of the block to be replaced if more than one type exists for that replaceTileName.replaceTileName is the name of the block that will be replaced.Replaced blocks will be dropped and can then be collected as if they were mined with a pickaxe or shovel. It will replace all blocks in the fill region, including air. It will replace only air blocks in the fill region. It will replace blocks on the outer edge of the fill region, and replaces inner blocks with air. It will replace blocks on the outer edge of the fill region, but does not replace the inner blocks. replace will replace all blocks in the fill region, including air.It is the data type or variation of the block if more than one type exists for that tileName. tileName is name of the block to fill the region.to is the ending x y z coordinate for the fill region.from is the starting x y z coordinate for the fill region.To replace one type of block in a region with another type of block: /fill replace Definitions To fill a region with a type of block: /fill Grass Block Texture Messed Up In Optifine Help Grass can spread downward and actually spread downward faster than upward. The spread is not affected by gaps or other in-between blocks. Grass spread at random intervals to a random block in the range. Grass doesn’t need direct contact to other blocks to spread. Ice and slime blocks don’t prevent grass from spreading. The block directly above the dirt block can’t be water, lava, or a waterlogged variant block.So if there is a semi-transparent on top of the dirt block, the grass can still spread to it as long as the above surface can contact the light. The dirt needs to have some light on it and the light level doesn’t matter.The source grass block needs a direct light of level 9 or brighter on top of it.The dirt block needs to be within the 3×3×5 range of the source grass.

Here is the requirement for grass to spread to a dirt block and make a glass block. Grass can spread to dirt blocks and make a grass block if the requirements are met. S To Make A Grass Block From A Dirt Block

Lively default 1.12.2