ProductVariantController.cs

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using System.Collections.Generic;
using UnityEngine;
 
 
[System.Serializable]
public class ProductVariant
{
    public string variantName = "Default";
 
    public Color baseColor = Color.white;
 
    [ColorUsage(false, true)]
    public Color emissiveColor = Color.black;
 
    [Range(0f, 1f)] public float metallic = 0.9f;
 
    [Range(0f, 1f)] public float smoothness = 0.85f;
}
 
public class ProductVariantController : MonoBehaviour
{
    // ------------------------------------------------------------------
    // Inspector fields
    // ------------------------------------------------------------------
 
    [Header("Body Renderers (color changes)")]
    public List<Renderer> bodyRenderers = new();
 
    [Header("Variants")]
    public List<ProductVariant> variants = new();
 
    // ------------------------------------------------------------------
    // Events
    // ------------------------------------------------------------------
 
    public System.Action<int, ProductVariant> OnVariantChanged;
 
    // ------------------------------------------------------------------
    // Private state
    // ------------------------------------------------------------------
 
    private int _currentIndex;
    private MaterialPropertyBlock _mpb;
 
    // ------------------------------------------------------------------
    // Unity lifecycle
    // ------------------------------------------------------------------
 
    void Awake() => _mpb = new MaterialPropertyBlock();
 
    void Start()
    {
        if (variants.Count > 0) Apply(0);
    }
 
    // ------------------------------------------------------------------
    // Public API
    // ------------------------------------------------------------------
 
    public void NextVariant()
    {
        _currentIndex = (_currentIndex + 1) % variants.Count;
        Apply(_currentIndex);
        OnVariantChanged?.Invoke(_currentIndex, variants[_currentIndex]);
    }
 
    public void PreviousVariant()
    {
        _currentIndex = (_currentIndex - 1 + variants.Count) % variants.Count;
        Apply(_currentIndex);
        OnVariantChanged?.Invoke(_currentIndex, variants[_currentIndex]);
    }
 
    public void SetVariantIndex(int index)
    {
        if (index < 0 || index >= variants.Count) return;
        _currentIndex = index;
        Apply(index);
        OnVariantChanged?.Invoke(_currentIndex, variants[_currentIndex]);
    }
 
    public ProductVariant CurrentVariant     => variants.Count > 0 ? variants[_currentIndex] : null;
 
    public int            CurrentIndex       => _currentIndex;
 
    public int            VariantCount       => variants.Count;
 
    public string         CurrentVariantName => CurrentVariant?.variantName ?? "";
 
    // ------------------------------------------------------------------
    // Private helpers
    // ------------------------------------------------------------------
 
    void Apply(int index)
    {
        ProductVariant v = variants[index];
        foreach (Renderer r in bodyRenderers)
        {
            if (r == null) continue;
            r.GetPropertyBlock(_mpb);
            _mpb.SetColor("_BaseColor",     v.baseColor);
            _mpb.SetFloat("_Metallic",      v.metallic);
            _mpb.SetFloat("_Smoothness",    v.smoothness);
            _mpb.SetColor("_EmissiveColor", v.emissiveColor);
            r.SetPropertyBlock(_mpb);
        }
    }
}