SetActiveTrailVertexStreams(List<ParticleSystemVertexStream>)

Definition

• Type: Method
• Namespace: UnityEngine
• Assembly: UnityEngine.ParticleSystemModule

public void SetActiveTrailVertexStreams(List<ParticleSystemVertexStream> streams)

Parameters

List<ParticleSystemVertexStream>

Remarks

using UnityEngine;using UnityEditor;using System.Collections.Generic;[RequireComponent(typeof(ParticleSystem))]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;        var trails = ps.trails;        trails.enabled = true;        trails.mode = ParticleSystemTrailMode.Ribbon;        // send custom data to the shader        psr.SetActiveTrailVertexStreams(new List<ParticleSystemVertexStream>(new ParticleSystemVertexStream[] { ParticleSystemVertexStream.Position, ParticleSystemVertexStream.Color, ParticleSystemVertexStream.UV, ParticleSystemVertexStream.Custom1X }));    }    void Update() {        Camera mainCam = Camera.main;        ps.GetCustomParticleData(customData, ParticleSystemCustomData.Custom1);        // If you know the particle count, or have a reasonable maxParticles threshold, consider caching        // this array instead of reallocating it on every frame, to avoid per-frame garbage.        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);            // 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);    }}

Shader "Particles/CustomTrailVertexStream" {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;                fixed4 color : COLOR;                float3 texcoordAndCustom : TEXCOORD0;            };            struct v2f {                float4 vertex : SV_POSITION;                fixed4 color : COLOR;                float2 texcoord : TEXCOORD0;                float 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.texcoordAndCustom.z);                v2f o;                o.vertex = mul(UNITY_MATRIX_MVP, 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.texcoordAndCustom.xy,_MainTex);                o.customData = v.texcoordAndCustom.z;                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, 0, 0, col.a);                fixed4 final = lerp(col, col*col2, i.customData.x);                UNITY_APPLY_FOG(i.fogCoord, final);                return final;            }            ENDCG        }    }}}