I was currently using the OnArmorTick method to spawn particles to create a sort of particle trail. It only shows up for me, how can I make it visible to all players?

 

@Override
public void onArmorTick(World world, EntityPlayer player, ItemStack itemStack)
{
	player.addPotionEffect(new PotionEffect(Potion.jump.getId(), 0, 1));
	player.addPotionEffect(new PotionEffect(Potion.moveSpeed.getId(), 0, 4));
	for (int count = 0; count < 2; count++){
		double X = player.posX;
		double Y = player.posY;
		double Z = player.posZ;
		Random random = player.worldObj.rand;
		for (int i = 0; i < 10; ++i)
		{
			int j1 = MathHelper.getRandomIntegerInRange(random, 0, 3);
			if(j1 == 0){
				player.worldObj.spawnParticle("reddust", (double)((float)X + random.nextFloat()), (double)Y - 1.5, (double)((float)Z + random.nextFloat()), 0, 0, 0);
			}
			if(j1 == 1){
				player.worldObj.spawnParticle("reddust", (double)((float)X - random.nextFloat()), (double)Y - 1.5, (double)((float)Z + random.nextFloat()), 0, 0, 0);
			}
			if(j1 == 2){
				player.worldObj.spawnParticle("reddust", (double)((float)X + random.nextFloat()), (double)Y - 1.5, (double)((float)Z - random.nextFloat()), 0, 0, 0);
			}
			if(j1 == 3){
				player.worldObj.spawnParticle("reddust", (double)((float)X - random.nextFloat()), (double)Y - 1.5, (double)((float)Z - random.nextFloat()), 0, 0, 0);
			}
		}	
	}
}

Post your code.

Try using the world parameter passed into the method and if that doesn't work you will need to use a custom packet.

I did not see that... Thank you, will try it.

Did not work, but can't believe I didn't notice the world parameter.

As said above you need to send a packet to nearby players and since there is a tutorial about it take this it is by Cool Alias he does a really good job a explaining things. :3

http://www.minecraftforum.net/forums/mapping-and-modding/mapping-and-modding-tutorials/2137055-1-7-x-1-8-customizing-packet-handling-with

Always specify the Minecraft version you're using in the thread title. Judging by the

PotionEffect

constructor you're using, I'd guess you're on 1.8.9.

 

If you look at the implementation of

World#spawnParticle

, you'll see that it does nothing on the server and spawns the specified particle on the client. You need to send a packet from the server to all nearby players telling their clients to spawn the particles. You could do this with your own packet, but Minecraft already provides the

WorldServer#spawnParticle

method to do this for you.

Funny, I was testing out if I could do this on the Event Handler, but the player wearing my armor sees particle effects below their feet. Other players see the particle effects two blocks below.

 

@SubscribeEvent
public void playerTickEvent(PlayerTickEvent event) {
	if(event.player.getCurrentArmor(3) != null){
		ItemStack helmet = event.player.getCurrentArmor(3);
		if(helmet.getItem() == SmallEnhancements.charm_mobility){

			for (int count = 0; count < 2; count++){
				double X = event.player.posX;
				double Y = event.player.posY;
				double Z = event.player.posZ;
				Random random = event.player.getEntityWorld().rand;
				for (int i = 0; i < 10; ++i)
				{
					int j1 = MathHelper.getRandomIntegerInRange(random, 0, 3);
					if(j1 == 0){
						event.player.getEntityWorld().spawnParticle("reddust", (double)((float)X + random.nextFloat()), (double)Y - 1.5, (double)((float)Z + random.nextFloat()), 0, 0.74901960784, 0.89803921568);
					}
					if(j1 == 1){
						event.player.getEntityWorld().spawnParticle("reddust", (double)((float)X - random.nextFloat()), (double)Y - 1.5, (double)((float)Z + random.nextFloat()), 0, 0.74901960784, 0.89803921568);
					}
					if(j1 == 2){
						event.player.getEntityWorld().spawnParticle("reddust", (double)((float)X + random.nextFloat()), (double)Y - 1.5, (double)((float)Z - random.nextFloat()), 0, 0.74901960784, 0.89803921568);
					}
					if(j1 == 3){
						event.player.getEntityWorld().spawnParticle("reddust", (double)((float)X - random.nextFloat()), (double)Y - 1.5, (double)((float)Z - random.nextFloat()), 0, 0.74901960784, 0.89803921568);
					}
				}	
			}
		}
	}
}

 

Also I use 1.7.10