UnityEditor.TerrainSplatEditor.ValidateTerrain C# (CSharp) Method

        private bool ValidateTerrain()
        {
            if ((this.m_Terrain == null) || (this.m_Terrain.terrainData == null))
            {
                EditorGUILayout.HelpBox("Terrain does not exist", MessageType.Error);
                return false;
            }
            return true;
        }
    }