Implementing a 6 blocks tall and 3 blocks wide decoration

[eternal hawk]

Do I need to split this decoration into 12 parts? Its java item

[weary temple]

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[lusty coral]

If you use a normal block renderer, yes.
For items you should get to 12 with item display entities or display settings in general

[eternal hawk]

Item display entities? like item frames?

[lusty coral]

no, the "item_display" entity (literal name)

This would summon an item display in 1.21.1 that renders stone 4 times its size (so 4x4x4 in the case of a normal stone block)
/summon item_display ~ ~ ~ {transformation:{left_rotation:[0f,0f,0f,1f],right_rotation:[0f,0f,0f,1f],translation:[0f,0f,0f],scale:[4f,4f,4f]},item:{id:"minecraft:stone",count:1}}

works with any other item ofc too

[eternal hawk]

Wow i didnt know that

So i just needed to make 3 block tall 1.5 block wide item, and rescale it in game with that?

[lusty coral]

Dunno about the width you want, but yeah, a 3 block tall model in Blokcbench would be 12 tall with that command ingame.

[eternal hawk]

The wdith is supposed to be 3 blocks wide

[lusty coral]

then 3/4 would be 0.75

(for the base model)