koobas.hobune.stream
Getting the position/intersection of collided particles
The purpose of this code is to create a fire explosion effect at the intersection of a particle when it collides with a plane. The only solutions I could find to gathering the intersection point was by using GetCollisionEvents and ParticleCollisionEvent. Although, when a ParticleCollisionEvent is added to _collisionEvents the function GetCollisionEvents seems to set the collider using an obsolete method. Is there anyway around this or any other solutions in gathering a particles point of intersection when a collision occurs? I have also looked at using ParticlePhysicsExtensions.GetCollisionEvents, but this is also obsolete.
public GameObject _ExplosionEffect;
public ParticleSystem _FireEmbers;
private List<ParticleCollisionEvent> _collisionEvents;
private void Start()
{
_collisionEvents = new List<ParticleCollisionEvent>();
}
private void OnParticleCollision(GameObject other)
{
_FireEmbers.GetCollisionEvents(other, _collisionEvents);
CreateExplosion(_collisionEvents[0]);
}
private void CreateExplosion(ParticleCollisionEvent particle)
{
_collisionEvents.Clear();
GameObject effect = Instantiate(_ExplosionEffect, particle.colliderComponent.transform);
effect.transform.localScale = new Vector3(0.1f, 0.1f, 0.1f);
effect.AddComponent<DestroyEffect>();
}
System.InvalidOperationException: collider property is deprecated. Use colliderComponent instead, which supports Collider and Collider2D components
This should work...
using UnityEngine;
using System.Collections;
public class OnParticleCollisionAlt : MonoBehaviour {
public GameObject myExplosion;
public GameObject prefabExplosion;
private ParticleSystem.CollisionEvent[] collisionEvents = new ParticleSystem.CollisionEvent[16];
void OnParticleCollision(GameObject other) {
int safeLength = particleSystem.safeCollisionEventSize;
if (collisionEvents.Length < safeLength)
collisionEvents = new ParticleSystem.CollisionEvent[safeLength];
int numCollisionEvents = particleSystem.GetCollisionEvents(other, collisionEvents);
int i = 0;
while (i < numCollisionEvents) {
Vector3 collisionHitLoc = collisionEvents[i].intersection;
myExplosion = Instantiate (prefabExplosion, collisionHitLoc, Quaternion.identity) as GameObject;
i++;
}
}
The stored event still contains the error System.InvalidOperationException: collider property is deprecated. Use colliderComponent ins$$anonymous$$d, which supports Collider and Collider2D components. (The one from the screenshot). As there is this error, all intersections are stored at 0, 0, 0 , so all effects instantiate here.
Also: ParticleSystem.CollisionEvent is obsolete particleSystem.safeCollisionEventSize is obsolete ParticleSystem.CollisionEvent[] collisionEvents = new ParticleSystem.CollisionEvent[16] using an array is obsolete (recommends a list)
Note: In $$anonymous$$any Cases, you can get away without using a loop in particle collision.
$$anonymous$$ake sure you are placing OnParticleCollision() inside a script that is ON the particle collider object. This is key. Because the other is the object the particles collide with, and it temporarily has a particle system added to it on Collision.
The particle system "part" in part.GetCollisionEvents(other, collisionEvents); is the system that created the particles. Other is the gameObject on which those particles died. They are mutually exclusive.
When you separate them you will find it all works.
