Can't get ParticleSystem GetCustomParticleData/SetCustomParticleData to work

Unity Engine
1

Hi all, I’m trying to use ParticleSystem GetCustomParticleData/SetCustomParticleData, I’ve had this working in 5.6 but don’t have the code in front of me.

I’ve tried this simple example from the Unity docs but when I step through the code GetCustomParticleData always returns vectors of 0,0,0,0

Has anyone tested this lately? I’m on 2017.1.0f3

Code:

using UnityEngine;
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>();
        UnityEngine.ParticleSystem.CustomDataModule customData = ps.customData;
        customData.enabled = true;

        customData.SetMode(ParticleSystemCustomData.Custom1, UnityEngine.ParticleSystemCustomDataMode.Vector);
        customData.SetVectorComponentCount(ParticleSystemCustomData.Custom1, 4);
        //customData.SetVector(ParticleSystemCustomData.Custom1, 0, 0);
        //customData.SetVector(ParticleSystemCustomData.Custom1, 1, 0);
        //customData.SetVector(ParticleSystemCustomData.Custom1, 2, 0);
        //customData.SetVector(ParticleSystemCustomData.Custom1, 3, 0);
    }

    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);
    }
}

TNKS!

G

2

EDIT: Spoke too soon, trying to come up with a good test case to log a bug

TL;DT Solution: Setup custom particle data in Start not Awake

I worked it out. The above is a simple test which actually works. In my dev code I was setting up the custom data in Awake not Start. I think the Particle system wasn’t correctly initialed when I was trying to set properties on it.

3

The same happened to me GetCustomParticleData always returns vectors of 0,0,0,0, only returns the correct uniqueID
when GetCustomParticleData happened after SetCustomParticleData in the update.
why? Is this is a bug? I’m on 2017.3.0

4

YUP! I logged it a while ago:
https://issuetracker.unity3d.com/issues/setting-particlesystem-dot-customdatamodule-data-mode-to-vector-or-color-causes-getcustomparticledata-slash-setcustomparticledata-to-fail

Though it was closed “By Design” :rage::rage::rage::rage::rage::rage::rage::rage:

5

Just added it as a feature request we can vote on:
https://feedback.unity3d.com/suggestions/set-and-get-custom-color-and-vector-data-for-particle-systems