【Unity3D】消融特效

1 前言

​ 选中物体消融特效中基于 Shader 实现了消融特效，本文将基于 Shader Graph 实现消融特效，两者原理一样，只是表达方式不同，另外，选中物体消融特效中通过 discard 丢弃片元，本文通过 alpha 测试丢弃片元。

​ Shader Graph环境搭建、简单应用详见→Shader Graph简介。

​ 本文完整资源见→Unity3D消融特效。

2 消融特效实现

​ 创建 Unlit Shader Graph，重命名为 DissolveEffect，编辑如下。

​ 其中，Alpha 测试需要在 Graph Settings 中开启，如下。

​ 为实现点击消失效果，需要编写脚本如下。

​ DieController.cs

using UnityEngine;   public class DieController : MonoBehaviour {     private RaycastHit hit; // 碰撞信息       private void Start() {         hit = new RaycastHit();     }      private void Update() {         if (Input.GetMouseButtonUp(0)) {             GameObject hitObj = GetHitObj();             if (hitObj != null) {                 GameObject rootObj = GetRootObj(hitObj);                 rootObj.AddComponent<DissolveEffect>();             }         }     }      private GameObject GetHitObj() { // 获取屏幕射线碰撞的物体         Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);         if (Physics.Raycast(ray, out hit)) {             return hit.collider.gameObject;         }         return null;     }      private GameObject GetRootObj(GameObject obj) { // 获取根对象         while (obj.transform.parent != null && obj.layer == obj.transform.parent.gameObject.layer) {             obj = obj.transform.parent.gameObject;         }         return obj;     } } 

​ DissolveEffect.cs

using UnityEngine;   [DisallowMultipleComponent] // 不允许在同一对象上挂载多个该组件 public class DissolveEffect : MonoBehaviour {     private Renderer[] renderers; // 渲染器     private Material dissolveMat; // 消融材质     private float burnSpeed = 0.25f; // 燃烧速度     private float burnAmount = 0; // 燃烧量, 值越大模型镂空的越多       private void Awake() {         dissolveMat = Resources.Load<Material>("DissolveMat");         renderers = GetComponentsInChildren<Renderer>();     }      private void OnEnable() {         foreach (Renderer renderer in renderers) {             Material[] materials = renderer.sharedMaterials;             Material[] dissolveMaterials = new Material[materials.Length];             for (int i = 0; i < materials.Length; i++) {                 Material newMaterial = new Material(dissolveMat);                 SetTexture(materials[i], newMaterial);                 SetColor(materials[i], newMaterial);                 newMaterial.SetFloat("_BurnAmount", 0);                 dissolveMaterials[i] = newMaterial;             }             renderer.sharedMaterials = dissolveMaterials;         }     }      private void Update() {         burnAmount += Time.deltaTime * burnSpeed;         foreach (Renderer renderer in renderers) {             Material[] materials = renderer.sharedMaterials;             foreach (Material material in materials) {                 material.SetFloat("_BurnAmount", burnAmount);             }         }         if (burnAmount >= 1f) {             Destroy(gameObject);         }     }      private void SetTexture(Material oldMaterial, Material newMaterial) { // 设置材质         if (oldMaterial.HasTexture("_MainTex")) {             Texture texture = oldMaterial.GetTexture("_MainTex");             newMaterial.SetTexture("_MainTex", texture);         }     }      private void SetColor(Material oldMaterial, Material newMaterial) { // 设置颜色         Color color = Color.white;         if (oldMaterial.HasColor("_Color")) {             color = oldMaterial.GetColor("_Color");         }         newMaterial.SetColor("_Color", color);     } } 

​ 运行效果如下。

​ 声明：本文转自【Unity3D】消融特效。