CubismRenderControllerFor3DSpace.cs

// Copyright (c) 2019 Soichiro Sugimoto.
// Licensed under the MIT License. See README in the project root for license information.

using UnityEngine;
using Live2D.Cubism.Rendering;

namespace Live2D_Extension
{
    public class CubismRenderControllerFor3DSpace : MonoBehaviour
    {
        [SerializeField] CubismRenderController _CubismRenderController;
        [SerializeField] GameObject _CubismModelDrawables;
        [SerializeField] Material _ArtMeshMaterial;

        [SerializeField] float _SortingOrderScale = 10000f;
        [SerializeField] CubismSortingMode _SortingMode = CubismSortingMode.BackToFrontOrder;

        MeshRenderer[] _MeshRenderers;

        void Start()
        {
            if (_ArtMeshMaterial != null)
            {
                _MeshRenderers = _CubismModelDrawables.GetComponentsInChildren<MeshRenderer>();
                foreach (MeshRenderer renderer in _MeshRenderers)
                {
                    renderer.material = _ArtMeshMaterial;
                }
            }
        }

        void Update()
        {
            UpdateSortingOrder();
        }

        void UpdateSortingOrder()
        {
            Vector3 cameraPos = Camera.main.transform.position;
            Vector3 modelPos = _CubismRenderController.gameObject.transform.position;
            Vector3 direction = cameraPos - modelPos;
            float distance =  direction.magnitude;

            int sortingOrder = Mathf.RoundToInt(-_SortingOrderScale * distance);
            _CubismRenderController.SortingOrder = sortingOrder;
        }
    }
}