Testfor block with custom name
I'm making "magic blocks": if you are standing on a specific block you get a potion effect like speed, instant health, strength, etc. The only problem is while trying to make it survival friendly I want the player to have to rename a diamond block to the certain name to make the potion effects work. /execute @a ~ ~ ~ detect ~ ~-1 ~ minecraft:diamond_block 0 /effect @a minecraft:strength 5 30
So that's what I use currently but is there an NBT tag that makes it so the detect part can testfor a diamond block that's been named in an anvil?
Best Answer
When you place a named block, it loses its name tag, making it impossible to detect if it was ever named. What you can do, however, is set a custom data value:
/setblock ~ ~ ~ diamond_block 1
Then, replace detect ~ ~-1 ~ diamond_block 0 with diamond_block 1. You can use values 1 through 15, but values above 15 are not supported.
Note: In some versions of the game (and possibly the latest updates), blocks with custom data may have a missing texture, and the custom data may not be saved properly. You'll have to look into this yourself as I can't test it at the moment.
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Answer 2
Blocks cannot have names. If you use an anvil, that only renames the item stack. Instead of trying to detect the block, try spawning an invisible marker armor stand with a custom name.
e.g. /summon ArmorStand ~ ~-1 ~ {Invisible:1, Marker: 1, CustomName: "Magic Block"}. You could then use the execute command to do things based on that armor stand.
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