Hi,

I'm trying to use raytracing for an item but when I check if the typeOfHit is an entity, its always false. Do you know why this is?

Heres my code:

@Override
public ItemStack onItemRightClick(ItemStack stack, World world, EntityPlayer player) {
	final double eyeHeight = 1.62;
	final double reachDistance = 300;
	Vec3 startPos = Vec3.createVectorHelper(player.posX, player.posY, player.posZ);
	if (!world.isRemote) startPos = startPos.addVector(0, eyeHeight, 0);
	Vec3 look = player.getLook(1.0F);
	Vec3 endPos = startPos.addVector(look.xCoord * reachDistance, look.yCoord * reachDistance, look.zCoord * reachDistance);
	MovingObjectPosition rarTrace = world.rayTraceBlocks(startPos, endPos);

	if (rarTrace != null) {
		int x = rarTrace.blockX;
		int y = rarTrace.blockY;
		int z = rarTrace.blockZ;
		List e = world.getEntitiesWithinAABBExcludingEntity(player, AxisAlignedBB.getBoundingBox(x-1, y-1, z-1, x+1, y+1, z+1));
		if(Math.abs(Math.sqrt(player.posX*player.posX + player.posY*player.posY + player.posZ*player.posZ) - Math.sqrt(x*x+y*y+z*z)) < 100){
			if(!player.capabilities.isCreativeMode)stack.damageItem(1, player);
			for(Object o : e){
				if(o instanceof EntityLivingBase)((EntityLivingBase)o).addPotionEffect(new PotionEffect(Potion.moveSlowdown.id, 100, 2, true));
			}
		}
	}
	return stack;
}

It's because rayTraceBlocks only raytraces blocks, not entities.

 

Look in EntityRenderer.getMouseOver() for the code which raytraces entities as well...

 

-TGG

Oops. Thanks. I'd imagine you'd then send a packet?

Hi

 

If you need server-side code, personally I'd just copy the entity-ray-tracing code to your own class and tweak it to do what you need, it's pretty straight forward.  Packet from client to server would also work.

 

Depending on what you're trying to do, Item.itemInteractionForEntity() might also work best of all.  See EntityPlayer.interactWith() for the relevant vanilla code related to interacting with Entity you've just clicked on.

Alternatively attack - see EntityPlayer.attackTargetEntityWithCurrentItem() such as AttackEntityEvent

 

-TGG