Hello everyone, hope you are doing great.
I’m quite new with everything related to URP. I followed this tutorial to get a nice ripple effect working when my character dashes. The problem is that later, I added URP to add lights and now I found that when using URP in Graphics2D, the ripple doesn’t work.
There’s just two files to look at: the script and the shader.
My question is, if maybe, someone knows how to “move” this so URP can detect it.
using UnityEngine;
using System.Collections;
public class RippleEffect : MonoBehaviour
{
public AnimationCurve waveform = new AnimationCurve(
new Keyframe(0.00f, 0.50f, 0, 0),
new Keyframe(0.05f, 1.00f, 0, 0),
new Keyframe(0.15f, 0.10f, 0, 0),
new Keyframe(0.25f, 0.80f, 0, 0),
new Keyframe(0.35f, 0.30f, 0, 0),
new Keyframe(0.45f, 0.60f, 0, 0),
new Keyframe(0.55f, 0.40f, 0, 0),
new Keyframe(0.65f, 0.55f, 0, 0),
new Keyframe(0.75f, 0.46f, 0, 0),
new Keyframe(0.85f, 0.52f, 0, 0),
new Keyframe(0.99f, 0.50f, 0, 0)
);
[Range(0.01f, 1.0f)]
public float refractionStrength = 0.5f;
public Color reflectionColor = Color.gray;
[Range(0.01f, 1.0f)]
public float reflectionStrength = 0.7f;
[Range(1.0f, 5.0f)]
public float waveSpeed = 1.25f;
[Range(0.0f, 2.0f)]
public float dropInterval = 0.5f;
[SerializeField, HideInInspector]
Shader shader;
class Droplet
{
Vector2 position;
float time;
public Droplet()
{
time = 1000;
}
public void Reset(Vector2 pos)
{
position = pos;
time = 0;
}
public void Update()
{
time += Time.deltaTime * 2;
}
public Vector4 MakeShaderParameter(float aspect)
{
return new Vector4(position.x * aspect, position.y, time, 0);
}
}
Droplet[ ] droplets;
Texture2D gradTexture;
Material material;
float timer;
int dropCount;
void UpdateShaderParameters()
{
var c = GetComponent();
material.SetVector(“_Drop1”, droplets[0].MakeShaderParameter(c.aspect));
material.SetVector(“_Drop2”, droplets[1].MakeShaderParameter(c.aspect));
material.SetVector(“_Drop3”, droplets[2].MakeShaderParameter(c.aspect));
material.SetColor(“_Reflection”, reflectionColor);
material.SetVector(“_Params1”, new Vector4(c.aspect, 1, 1 / waveSpeed, 0));
material.SetVector(“_Params2”, new Vector4(1, 1 / c.aspect, refractionStrength, reflectionStrength));
}
void Awake()
{
droplets = new Droplet[3];
droplets[0] = new Droplet();
droplets[1] = new Droplet();
droplets[2] = new Droplet();
gradTexture = new Texture2D(2048, 1, TextureFormat.Alpha8, false);
gradTexture.wrapMode = TextureWrapMode.Clamp;
gradTexture.filterMode = FilterMode.Bilinear;
for (var i = 0; i < gradTexture.width; i++)
{
var x = 1.0f / gradTexture.width * i;
var a = waveform.Evaluate(x);
gradTexture.SetPixel(i, 0, new Color(a, a, a, a));
}
gradTexture.Apply();
material = new Material(shader);
material.hideFlags = HideFlags.DontSave;
material.SetTexture(“_GradTex”, gradTexture);
UpdateShaderParameters();
}
void Update()
{
if (dropInterval > 0)
{
timer += Time.deltaTime;
while (timer > dropInterval)
{
//Emit();
timer -= dropInterval;
}
}
foreach (var d in droplets) d.Update();
UpdateShaderParameters();
}
void OnRenderImage(RenderTexture source, RenderTexture destination)
{
Graphics.Blit(source, destination, material);
}
public void Emit(Vector2 pos)
{
droplets[dropCount++ % droplets.Length].Reset(pos);
}
IEnumerator Stop()
{
yield return new WaitForSeconds(.3f);
}
}
And the shader:
Shader “Hidden/Ripple Effect”
{
Properties
{
_MainTex(“Base”, 2D) = “white” {}
_GradTex(“Gradient”, 2D) = “white” {}
_Reflection(“Reflection Color”, Color) = (0, 0, 0, 0)
_Params1(“Parameters 1”, Vector) = (1, 1, 0.8, 0)
_Params2(“Parameters 2”, Vector) = (1, 1, 1, 0)
_Drop1(“Drop 1”, Vector) = (0.49, 0.5, 0, 0)
_Drop2(“Drop 2”, Vector) = (0.50, 0.5, 0, 0)
_Drop3(“Drop 3”, Vector) = (0.51, 0.5, 0, 0)
}
CGINCLUDE
#include “UnityCG.cginc”
sampler2D _MainTex;
float2 _MainTex_TexelSize;
sampler2D _GradTex;
half4 _Reflection;
float4 _Params1; // [ aspect, 1, scale, 0 ]
float4 _Params2; // [ 1, 1/aspect, refraction, reflection ]
float3 _Drop1;
float3 _Drop2;
float3 _Drop3;
float wave(float2 position, float2 origin, float time)
{
float d = length(position - origin);
float t = time - d * _Params1.z;
return (tex2D(_GradTex, float2(t, 0)).a - 0.5f) * 2;
}
float allwave(float2 position)
{
return
wave(position, _Drop1.xy, _Drop1.z) +
wave(position, _Drop2.xy, _Drop2.z) +
wave(position, _Drop3.xy, _Drop3.z);
}
half4 frag(v2f_img i) : SV_Target
{
const float2 dx = float2(0.01f, 0);
const float2 dy = float2(0, 0.01f);
float2 p = i.uv * _Params1.xy;
float w = allwave(p);
float2 dw = float2(allwave(p + dx) - w, allwave(p + dy) - w);
float2 duv = dw * _Params2.xy * 0.2f * _Params2.z;
half4 c = tex2D(_MainTex, i.uv + duv);
float fr = pow(length(dw) * 3 * _Params2.w, 3);
return lerp(c, _Reflection, fr);
}
ENDCG
SubShader
{
Pass
{
ZTest Always Cull Off ZWrite Off
Fog { Mode off }
CGPROGRAM
#pragma fragmentoption ARB_precision_hint_fastest
#pragma target 3.0
#pragma vertex vert_img
#pragma fragment frag
ENDCG
}
}
}
Thank you very much and thanks for guiding me in the right direction.
