voxel-building-system/Runtime/BuildingBlueprintController.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using KairoEngine.Core;

namespace KairoEngine.VoxelBuildingSystem
{
    public class BuildingBlueprintController : MonoBehaviour
    {
        public VoxelBuildingSystem buildingSystem;
        public Transform currentBlueprint;

        private void Start() {
            RefreshVisual();
            GenericEvents.StartListening("OnSelectedChanged", OnSelectedChanged);
        }

        private void OnDisable()
        {
            GenericEvents.StopListening("OnSelectedChanged", OnSelectedChanged);
        }

        private void OnSelectedChanged() {
            RefreshVisual();
        }

        private void LateUpdate() {
            if(currentBlueprint == null) return;
            Vector3 targetPosition = buildingSystem.GetMouseWorldSnappedPosition();
            //targetPosition.y = 1f;
            currentBlueprint.transform.position = Vector3.Lerp(currentBlueprint.transform.position, targetPosition, Time.deltaTime * 15f);
            currentBlueprint.transform.rotation = Quaternion.Lerp(transform.rotation, buildingSystem.transform.rotation, Time.deltaTime * 15f);
            if(buildingSystem.tool == VoxelBuildingTool.Build) currentBlueprint.gameObject.SetActive(true);
            else currentBlueprint.gameObject.SetActive(false);
        }

        private void RefreshVisual() {
            if (currentBlueprint != null) {
                Destroy(currentBlueprint.gameObject);
                currentBlueprint = null;
            }
            BuildingTemplate buildingTemplate = buildingSystem.buildingTemplates[buildingSystem.currentBuildingTemplate];
            if (buildingTemplate != null) {
                currentBlueprint = Instantiate(buildingTemplate.visual, Vector3.zero, Quaternion.identity);
                currentBlueprint.parent = transform;
                currentBlueprint.localPosition = Vector3.zero;
                currentBlueprint.localEulerAngles = Vector3.zero;
            }
        }
        
    }
}