unity3d：运动残影

逃离我推掉我的手 2022-03-08 19:46 256阅读 0赞

Shader "Custom/GhostOnly_Transparent" 
    {
    	Properties 
    	{
    		_MainTex ("Base (RGB)", 2D) = "white" {}
    		_GhostColor ("Ghost Color", Color) = (0, 1, 0, 1)
    		_Pow ("Pow Factor", int) = 2
    	}
    	
    	SubShader 
    	{
    		Tags { "RenderType"="Transparent" "Queue" = "Transparent"}
    		LOD 200
    		
    		Zwrite Off
            Ztest Always
            Blend SrcAlpha One
    		CGPROGRAM
    		#pragma surface surf Unlit keepalpha
            
            sampler2D _MainTex;
    		half4 _GhostColor;
    		int _Pow;
    
    		struct Input 
    		{
    		    float3 viewDir;
    		    float2 uv_MainTex;
    		};
    		
    		fixed4 LightingUnlit(SurfaceOutput s, fixed3 lightDir, fixed atten)
    		 {
    		     fixed4 c;
    		     c.rgb = s.Albedo; 
    		     c.a = s.Alpha;
    		     return c;
    		 }
    
    		void surf (Input IN, inout SurfaceOutput o) 
    		{
    		    half4 c = tex2D (_MainTex, IN.uv_MainTex);
    		    float3 worldNormal = WorldNormalVector(IN, o.Normal);
    			o.Albedo = _GhostColor.rgb;
    			
    			half alpha = 1.0 - saturate(dot (normalize(IN.viewDir), worldNormal));
    			alpha = pow(alpha, _Pow);
    			o.Alpha = c.a * _GhostColor.a * alpha;
    		}
    		ENDCG
    	} 
    	FallBack "Diffuse"
    }

挂载脚本到需要的残影的GameObject上

using UnityEngine;
    using System.Collections;
    
    public class GhostShadow : MonoBehaviour {
        public Color shadowColor;
        //持续时间
        public float duration = 2f;
        //创建新残影间隔
        public float interval = 0.1f;
        
        //网格数据
        SkinnedMeshRenderer[] meshRender;
    
        //X-ray
        Shader ghostShader;
    
        void Start()
        {
            //获取身上所有的Mesh
            meshRender = this.gameObject.GetComponentsInChildren<SkinnedMeshRenderer>();
            ghostShader = Shader.Find("Custom/GhostOnly_Transparent");
        }
    
        private float lastTime = 0;
    
        private Vector3 lastPos = Vector3.zero;
    
        void Update()
        {
            //人物有位移才创建残影
            if (lastPos == this.transform.position)
            {
                return;
            }
            lastPos = this.transform.position;
            if (Time.time - lastTime < interval)
            {//残影间隔时间
                return;
            }
            lastTime = Time.time;
    
            if (meshRender == null)
                return;
            for (int i = 0; i < meshRender.Length; i++)
            {
                Mesh mesh = new Mesh();
                meshRender[i].BakeMesh(mesh);
    
                GameObject go = new GameObject();
                go.hideFlags = HideFlags.HideAndDontSave;
    
                GhostItem item = go.AddComponent<GhostItem>();//控制残影消失
                item.duration = duration;
                item.deleteTime = Time.time + duration;
    
                MeshFilter filter = go.AddComponent<MeshFilter>();
                filter.mesh = mesh;
    
                MeshRenderer meshRen = go.AddComponent<MeshRenderer>();
    
                meshRen.material = meshRender[i].material;
                meshRen.material.shader = ghostShader;
                meshRen.material.SetInt("_Pow", -10);
                shadowColor.a = 1;
                meshRen.material.SetColor("_GhostColor", shadowColor);
    
                go.transform.localScale = meshRender[i].transform.localScale;
                go.transform.position = meshRender[i].transform.position;
                go.transform.rotation = meshRender[i].transform.rotation;
    
                item.meshRenderer = meshRen;
            }
        }
    }

using UnityEngine;
    using System.Collections;
    
    public class GhostItem : MonoBehaviour {
    
        //持续时间
        public float duration;
        //销毁时间
        public float deleteTime;
    
        public MeshRenderer meshRenderer;
    
        void Update()
        {
            float tempTime = deleteTime - Time.time;
            if (tempTime <= 0)
            {//到时间就销毁
                GameObject.Destroy(this.gameObject);
            }
            else if (meshRenderer.material)
            {
                meshRenderer.material.SetInt("_Pow", meshRenderer.material.GetInt("_Pow") + 1);
            }
    
        }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x1b3lpa3Vu_size_16_color_FFFFFF_t_70]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2x1b3lpa3Vu_size_16_color_FFFFFF_t_70]: /images/20220308/650a17bbddbf44d9bceff21b7e3d5e00.png