How can I change the size of an item when held in Minecraft 1.8.9?

Question

I'm trying to change the size of an iron sword so that it's bigger when held. I’m in Minecraft Java version 1.8.9.

I have a file named iron_sword.json and it’s directory is assets/textures/models/item/iron_sword.json It’s content is the following.

{
    "parent": "item/generated",
    "textures": {
        "layer0": "item/iron_sword"
    },
    "display": {
        "thirdperson": {
            "rotation": [ 0, 90, -35 ],
            "translation": [ 0, 1.25, -4.2 ],
            "scale": [ 1.2, 1.2, 1.2 ]
        },
        "firstperson": {
            "rotation": [ 0, -135, 25 ],
            "translation": [ 0, 4, 2 ],
            "scale": [ 1.7, 1.7, 1.7 ]
        }
    }
}

I don’t know what is wrong. Is it the file directory or the content of the file?

Answer 1

It would make sense to increase the scale for both third and first person views. Your current scale is:

(third person)

[ 1.2, 1.2, 1.2 ]

(first person)

[ 1.7, 1.7, 1.7 ]

Try increasing the scale up a bit, matching for each value in the string. For example, below I've increased the ratios by 0.3 each. This can be a test to see if it works for you.

(third person)

[ 1.5, 1.5, 1.5 ]

(first person)

[ 2.0, 2.0, 2.0 ]