https://sims4studio.com/thread/720/make-standalone-eye-recolor

Introduction

This tutorial will show you how to make a standalone eye recolor. The swatch thumbnail for it will appear in the eye color swatch thumbnail list just as EA's eye colors do.

What you will need

Sims 4 Studio

Instructions

  1. Enter your creator name if you have not done so. Choose Add CAS Part Swatch under the CAS button.

  1. Select the eye color you wish to clone by clicking on the thumbnail picture of it.

  1. Click the Export Texture button. Name the .dds and save it.

  1. Using the .dds you exported as your template make your new eye color and save it.

  2. Click on the swatch thumbnail and select a color for your new swatch thumbnail. Note: the eye system used in Sims 4 does not allow custom catalog thumbnails for eye recolors.

Put the .package in your Mods folder and check it in the game. Your swatch will appear in the Eyes swatch thumbnail list.