| customData | The array of per-particle data. |
| streamIndex | Which stream to assign the data to. |
Set a stream of custom per-particle data.
no example available in JavaScript
using UnityEngine; using UnityEditor; using System.Collections.Generic;
public class ExampleClass : MonoBehaviour {
private ParticleSystem ps; private ParticleSystemRenderer psr; private List<Vector4> customData = new List<Vector4>(); public float minDist = 30.0f;
void Start() {
ps = GetComponent<ParticleSystem>(); psr = GetComponent<ParticleSystemRenderer>();
// emit in a sphere with no speed var main = ps.main; main.startSpeedMultiplier = 0.0f; main.simulationSpace = ParticleSystemSimulationSpace.World; // so our particle positions don't require any extra transformation, to compare with the mouse position var emission = ps.emission; emission.rateOverTimeMultiplier = 200.0f; var shape = ps.shape; shape.shapeType = ParticleSystemShapeType.Sphere; shape.radius = 4.0f; psr.sortMode = ParticleSystemSortMode.YoungestInFront;
// send custom data to the shader psr.EnableVertexStreams(ParticleSystemVertexStreams.Custom1); }
void Update() {
Camera mainCam = Camera.main;
ps.GetCustomParticleData(customData, ParticleSystemCustomData.Custom1);
int particleCount = ps.particleCount; ParticleSystem.Particle[] particles = new ParticleSystem.Particle[particleCount]; ps.GetParticles(particles);
for (int i = 0; i < particles.Length; i++) { Vector3 sPos = mainCam.WorldToScreenPoint(particles[i].position + ps.transform.position);
// set custom data to 1, if close enough to the mouse if (Vector2.Distance(sPos, Input.mousePosition) < minDist) { customData[i] = new Vector4(1, 0, 0, 0); } // otherwise, fade the custom data back to 0 else { float particleLife = particles[i].remainingLifetime / ps.main.startLifetimeMultiplier;
if (customData[i].x > 0) { float x = customData[i].x; x = Mathf.Max(x - Time.deltaTime, 0.0f); customData[i] = new Vector4(x, 0, 0, 0); } } }
ps.SetCustomParticleData(customData, ParticleSystemCustomData.Custom1); }
void OnGUI() {
minDist = GUI.HorizontalSlider(new Rect(25, 40, 100, 30), minDist, 0.0f, 100.0f); } }
Here is an example of a custom shader that can be used with the above script:
Shader "Particles/CustomVertexStream" { Properties { _TintColor ("Tint Color", Color) = (0.5,0.5,0.5,0.5) _MainTex ("Particle Texture", 2D) = "white" {} _OffsetValue("Offset Value", Range(0,1)) = 0.4 }
Category { Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" } Blend SrcAlpha OneMinusSrcAlpha ColorMask RGB Cull Off Lighting Off ZWrite Off
SubShader { Pass {
CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma multi_compile_particles #pragma multi_compile_fog
#include "UnityCG.cginc"
sampler2D _MainTex; fixed4 _TintColor; float _OffsetValue;
struct appdata_t { float4 vertex : POSITION; float3 normal : NORMAL; fixed4 color : COLOR; float2 texcoord : TEXCOORD0; float4 customData : TEXCOORD1; };
struct v2f { float4 vertex : SV_POSITION; fixed4 color : COLOR; float2 texcoord : TEXCOORD0; float4 customData : TEXCOORD1; UNITY_FOG_COORDS(2) };
float4 _MainTex_ST;
v2f vert (appdata_t v) { v.vertex.y = lerp(v.vertex.y, v.vertex.y + _OffsetValue, v.customData.x);
v2f o; o.vertex = UnityObjectToClipPos(v.vertex);
float4 offsetX = float4(-1, 1, 1, -1); float4 offsetY = float4(1, 1, -1, -1);
o.color = v.color; o.texcoord = TRANSFORM_TEX(v.texcoord,_MainTex); o.customData = v.customData; UNITY_TRANSFER_FOG(o,o.vertex);
return o; }
fixed4 frag (v2f i) : SV_Target { fixed4 col = 2.0f * i.color * _TintColor * tex2D(_MainTex, i.texcoord); fixed4 col2 = fixed4(i.customData.x, i.customData.y, i.customData.z, col.a); fixed4 final = lerp(col, col*col2, i.customData.x);
UNITY_APPLY_FOG(i.fogCoord, final); return final; } ENDCG } } } }
Shader "Particles/CustomVertexStream" { Properties { _TintColor ("Tint Color", Color) = (0.5,0.5,0.5,0.5) _MainTex ("Particle Texture", 2D) = "white" {} _OffsetValue("Offset Value", Range(0,1)) = 0.4 }
Category { Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" } Blend SrcAlpha OneMinusSrcAlpha ColorMask RGB Cull Off Lighting Off ZWrite Off
SubShader { Pass {
CGPROGRAM #pragma vertex vert #pragma fragment frag #pragma multi_compile_particles #pragma multi_compile_fog
#include "UnityCG.cginc"
sampler2D _MainTex; fixed4 _TintColor; float _OffsetValue;
struct appdata_t { float4 vertex : POSITION; float3 normal : NORMAL; fixed4 color : COLOR; float2 texcoord : TEXCOORD0; float4 customData : TEXCOORD1; };
struct v2f { float4 vertex : SV_POSITION; fixed4 color : COLOR; float2 texcoord : TEXCOORD0; float4 customData : TEXCOORD1; UNITY_FOG_COORDS(2) };
float4 _MainTex_ST;
v2f vert (appdata_t v) { v.vertex.y = lerp(v.vertex.y, v.vertex.y + _OffsetValue, v.customData.x);
v2f o; o.vertex = UnityObjectToClipPos(v.vertex);
float4 offsetX = float4(-1, 1, 1, -1); float4 offsetY = float4(1, 1, -1, -1);
o.color = v.color; o.texcoord = TRANSFORM_TEX(v.texcoord,_MainTex); o.customData = v.customData; UNITY_TRANSFER_FOG(o,o.vertex);
return o; }
fixed4 frag (v2f i) : SV_Target { fixed4 col = 2.0f * i.color * _TintColor * tex2D(_MainTex, i.texcoord); fixed4 col2 = fixed4(i.customData.x, i.customData.y, i.customData.z, col.a); fixed4 final = lerp(col, col*col2, i.customData.x);
UNITY_APPLY_FOG(i.fogCoord, final); return final; } ENDCG } } } }
Here is an example of a script that assigns a unique ID to each particle when it is born:
no example available in JavaScript
using UnityEngine; using UnityEditor; using System.Collections.Generic;
public class ExampleClass : MonoBehaviour {
private ParticleSystem ps; private List<Vector4> customData = new List<Vector4>(); private int uniqueID;
void Start() {
ps = GetComponent<ParticleSystem>(); }
void Update() {
ps.GetCustomParticleData(customData, ParticleSystemCustomData.Custom1);
for (int i = 0; i < customData.Count; i++) { // set custom data to the next ID, if it is in the default 0 state if (customData[i].x == 0.0f) { customData[i] = new Vector4(++uniqueID, 0, 0, 0); } }
ps.SetCustomParticleData(customData, ParticleSystemCustomData.Custom1); } }