Help Liquid-to-Liquid Collision

[gotou]

I am developing a chemical experiment environment using VR.
My plan is below.
When user mixes liquid A and liquid B, after that, its mixed liquid is displayed as a percentage; 70% or more is "perfect", 40% or more is "successful", and under 39% is "Failed" respectively.
Also, if liquid A is mixed with liquid C, an explosion is happened and "Failed" is displayed.

However, I made, installed and runed the scripts, nothing happened on VR. I think the reason why I cannot get the collision between particles.
However, I am not sure how to modify the script.
If you know the solution. Could you assist me?

Reference: Obi Fluid's sample "Maze", "Obi Manual" http://obi.virtualmethodstudio.com/tutor...rials.html Assets I'm using: SteamVR Plugin, SAColliderBuilder, Obi Fluid Version of Unity: Unity 2019.4

I am looking forward to hearing your answer.

Sincerely yours,

Code:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using Obi;

[RequireComponent(typeof(ObiEmitter))]
public class Chemicalreaction : MonoBehaviour
{
    [System.Serializable]
    public class ScoreChangeEvent : UnityEvent<int, int> { }

    public List<ParticleCollisionEvent> collisionEvents;

    public ObiSolver solver;
    public ObiEmitter emitterA;
    public ObiEmitter emitterB;
    public ObiEmitter emitterC;
    public ObiCollider finishLine;

    public Text completionLabel;
    public Text mixLabel;
    public Text finishLabel;
    public Text Gameover;

    HashSet<int> finishedParticles = new HashSet<int>();
    HashSet<int> coloredParticles = new HashSet<int>();

    void Start()
    {
        solver.OnParticleCollision += Solver_OnParticleCollision;

        collisionEvents = new List<ParticleCollisionEvent>();
    }

    private void OnDestory()
    {
        solver.OnParticleCollision -= Solver_OnParticleCollision;

    }


    private void Solver_OnParticleCollision(ObiSolver s, Obi.ObiSolver.ObiCollisionEventArgs e)
    {
        var world = ObiColliderWorld.GetInstance();
        foreach (Oni.Contact contact in e.contacts)
        {
            ObiSolver.ParticleInActor pa = solver.particleToActor[contact.particle];
            if (contact.distance < 0.01f)
            {
                var col = world.colliderHandles[contact.other].owner;
                if (emitterB.GetComponent<ObiEmitter>() == pa.actor)
                {
                    if (coloredParticles.Add(contact.particle))
                        UpdateScore(finishedParticles.Count, coloredParticles.Count);
                }
                else if (emitterC.GetComponent<ObiEmitter>() == pa.actor)
                {
                    if (coloredParticles.Add(contact.particle))
                        Gameover.text = "Failed";
                }
                else if (finishLine == col)
                {
                    if (finishedParticles.Add(contact.particle))
                        UpdateScore(finishedParticles.Count, coloredParticles.Count);
                }
            }
        }
    }

    public void UpdateScore(int finishedParticles, int coloredParticles)
    {
        int completion = Mathf.CeilToInt(finishedParticles / 600.0f * 100);
        int mix = Mathf.CeilToInt(coloredParticles / 600.0f * 100);

        completionLabel.text = completion + "% Completed";
        mixLabel.text = mix + "% Mixed";

        if (completion > 50)
        {
            if (mix > 70)
            {
                finishLabel.text = "Perfect!";
            }
            else if (mix > 40)
            {
                finishLabel.text = "Successful";
            }
            else
            {
                finishLabel.text = "Failed";
            }
            finishLabel.gameObject.SetActive(true);
        }

    }
}