Adding OptiFine

Instruction for adding OptiFine into Impact

If you prefer, a video tutorial is also available.

First, install Impact

See Installation

Download optifine here

You can find it here

Run the optifine installer

You will need Java on your system to do so

Navigate to your .minecraft folder

• If you don't know where it probably is in %appdata%/.minecraft (for Windows)
• Press Win+r and paste, or paste it in Windows Explore and hit enter

Copying the OptiFine file

• Navigate into /versions
• You will find the OptiFine and Impact folders here
• First navigate into the folder of OptiFine that you want to install

You will see

    {
      "name": "optifine:OptiFine:1.12.2_HD_U_E2" //can be anything else depending on your version
    },

• Copy that from YOUR optifine.json FILE

Editing Impact.json

• Now go back to the versions and navigate to the folder and find the .json inside you wanted to install for
• You will need to add paste what you copied here

  "libraries": [
    {
      "name": "optifine:OptiFine:1.12.2_HD_U_E2"
    },
    { ...

like this

Adding OptiFine's tweaker

Versions between 4.0 and 4.5 (and 4.6 1.12.2)

• Go to

"minecraftArguments": "--username ${auth_player_name} --version ${version_name} --gameDir ${game_directory} --assetsDir ${assets_root} --assetIndex ${assets_index_name} --uuid ${auth_uuid} --accessToken ${auth_access_token} --userType ${user_type} --tweakClass clientapi.load.ClientTweaker",

and add in --tweakClass optifine.OptiFineForgeTweaker to the end of the argument/line like this

  "minecraftArguments": "--username ${auth_player_name} --version ${version_name} --gameDir ${game_directory} --assetsDir ${assets_root} --assetIndex ${assets_index_name} --uuid ${auth_uuid} --accessToken ${auth_access_token} --userType ${user_type} --tweakClass clientapi.load.ClientTweaker --tweakClass optifine.OptiFineForgeTweaker",

Versions from 4.6 (1.13.2) and up

Find the "arguments": { "game": [] } section, it'll look like this:

"arguments": {
  "game": [
    "--tweakClass",
    "clientapi.load.ClientTweaker",
    "--tweakClass",
    "baritone.launch.BaritoneTweaker"
  ]
},

Add "--tweakClass" and "optifine.OptiFineForgeTweaker" to the game array so that it looks like:

"arguments": {
  "game": [
    "--tweakClass",
    "clientapi.load.ClientTweaker",
    "--tweakClass",
    "baritone.launch.BaritoneTweaker",
    "--tweakClass",
    "optifine.OptiFineForgeTweaker"
  ]
},

When it's completed just restart your launcher and you should have OptiFine

[Advanced] Have multiple profiles consist of one having OptiFine and the other without

Before the editing impact.json step, you should make a copy of Impact's folder make sure to remember & copy what the folder was named and also rename the impact.json to whatever the folder was named

After done editing impact.json you will want to edit

  "id": "1.12.2-Impact_4.3",

to whatever the folder was named example of mine is

"id": "1.12.2-Impact_4.3-Optifine",

Now restart your launcher and you will find a new profile named whatever the folder was named if you did it correctly