lsh4/Assets/InTerra/Scripts/InTerra_TerrainData.cs

using UnityEngine;

namespace InTerra
{
    [ExecuteInEditMode]
    public class InTerra_TerrainData : MonoBehaviour
    {
        [HideInInspector] MaterialPropertyBlock mtb;
        [HideInInspector] public Terrain terrain;

        void Start()
        {
            gameObject.TryGetComponent<Terrain>(out terrain);
        }

        void Update()
        {
            if (terrain)
            {   
                if (terrain.materialTemplate && InTerra_Data.EightLayersEnabled(terrain.materialTemplate) && terrain.terrainData.terrainLayers.Length > 4)
                {
                    if (mtb == null)
                    {
                        mtb = new MaterialPropertyBlock();
                    }

                    terrain.GetSplatMaterialPropertyBlock(mtb);
                    

                    if (!mtb.GetTexture("_Control1") || !mtb.GetTexture("_Splat4"))
                    {
                        for (int i = 0; i < terrain.terrainData.alphamapLayers && i < 8; i++)
                        {
                            InTerra_Data.TerrainLaeyrDataToTerrain(terrain.terrainData.size, terrain.terrainData.terrainLayers[i], i, mtb);
                        }

                        mtb.SetTexture("_Control", terrain.terrainData.alphamapTextureCount > 0 ? terrain.terrainData.alphamapTextures[0] : Texture2D.redTexture);
                        mtb.SetTexture("_Control1", terrain.terrainData.alphamapTextureCount > 1 ? terrain.terrainData.alphamapTextures[1] : Texture2D.blackTexture);

                        terrain.SetSplatMaterialPropertyBlock(mtb);
                        terrain.terrainData.SetBaseMapDirty(); 
                    }
                }
                else
                {
                    if(mtb != null)
                    { 
                        mtb.Clear();
                        mtb.SetFloat("_NumLayersCount", terrain.terrainData.alphamapLayers);
                        terrain.SetSplatMaterialPropertyBlock(mtb);
                    }
                }
            }
            else
            {
                gameObject.TryGetComponent<Terrain>(out terrain);
            }
        }
    }
}