Smoothness TextureからUnity Standard Shader用MetallicSmoothnessテクスチャを作ります(複数枚対応)(Metallicは固定値)

MetallicSmoothnessTextureGenerator.cs

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using UnityEditor;
using UnityEngine;


public class MetallicSmoothnessTextureGenerator : EditorWindow
{
    private float _metallic;
    private bool _isRoughness;
    private string _suffix;
    [SerializeField] private List<Texture2D> smoothnessTextures;

    [MenuItem("HALBY/MetallicSmoothness Texture Generator")]
    private static void Create()
    {
        // 生成
        GetWindow<MetallicSmoothnessTextureGenerator>("MetallicSmoothness Texture Generator");
    }

    private void OnGUI()
    {
        var so = new SerializedObject(this);
        so.Update();

        _metallic = EditorGUILayout.Slider("Metallic", _metallic, 0.0f, 1.0f);
        _suffix = EditorGUILayout.TextField("Suffix", _suffix);
        _isRoughness = EditorGUILayout.Toggle("Is Roughness", _isRoughness);

        EditorGUILayout.PropertyField(so.FindProperty("smoothnessTextures"), true);

        so.ApplyModifiedProperties();

        // if (GUILayout.Button("Path Test"))
        // {
        //     foreach (var texture in smoothnessTextures)
        //     {
        //         var pathWithExt = AssetDatabase.GetAssetPath(texture);
        //         var assetPath = Regex.Replace(pathWithExt, ".[^.]+$", string.Empty);
        //         var fullPath = Path.GetFullPath(assetPath);
        //         Debug.Log(fullPath);
        //     }
        // }

        if (GUILayout.Button("Generate"))
        {
            var ms = smoothnessTextures.Select(t =>
            {
                var newTex = new Texture2D(t.width, t.height, TextureFormat.RGBAFloat, false);
                var colors = t.GetPixels().Select(c =>
                    new Color(_metallic, _metallic, _metallic, _isRoughness ? 1 - c.r : c.r));
                newTex.SetPixels(colors.ToArray());
                return (newTex, AssetDatabase.GetAssetPath(t));
            });

            foreach (var (tex, pathWithExt) in ms)
            {
                var assetPath = Regex.Replace(pathWithExt, ".[^.]+$", string.Empty);
                var fullPath = Path.GetFullPath(assetPath) + _suffix + ".png";
                // Debug.Log(fullPath);

                var png = tex.EncodeToPNG();

                File.WriteAllBytes(fullPath, png);
            }
        }
    }
}