Hello,

 

I have been having trouble figuring out how to make my sword spawn lightning on right click where I look. I have basic knowledge of java, I am currently taking mod design 2 on youth digital. I still don't know what vectors, and par2 and all that means, Im not very advanced.

This is what I have so far:

package mymod.items;

import library.items.LibItemSword;
import library.util.Actions;
import mymod.Main;
import net.minecraft.block.material.Material;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.item.ItemStack;
import net.minecraft.potion.Potion;
import net.minecraft.potion.PotionEffect;
import net.minecraft.potion.PotionHealth;
import net.minecraft.util.ActionResult;
import net.minecraft.util.EnumHand;
import net.minecraft.world.World;
import net.minecraftforge.event.entity.player.PlayerInteractEvent;

public class MySword2 extends LibItemSword {

	public MySword2(String registryName, ToolMaterial material) {
		super(registryName, material);
		this.setCreativeTab(Main.my_creative_tab_1);
		this.setScale(0.5F);
	}

	
	@Override
	public boolean hitEntity(ItemStack stack, EntityLivingBase hitEntity, EntityLivingBase attackingEntity)
	{
	hitEntity.addPotionEffect(new PotionEffect(Potion.getPotionById(2), 100, 10));
	return true;
	}
	
	@Override
	public ActionResult<ItemStack> onItemRightClick(World worldIn, EntityPlayer playerIn, EnumHand handIn) {
		//Actions.summonLightningAtPosition(worldIn, playerIn.get, 5);
		
		return super.onItemRightClick(worldIn, playerIn, handIn);
	}
}

If you could help that would be greatly appreciated.

You need to create a new lightning entity and spawn it in the world at the desired postiion.

You can get that by doing a ray trace from the player's eye position and look vector and getting the point that that ray collides with something.

There's a raytrace method in the World class that will work (look for a method that returns MovingObjectPosition)

A Vector is a Way in the world. It can start at any point and end at any point 

That means it has a X, a Y and a Z amount of units.

It is more simple than it sounds, really.

 

par2 is probably a parameter.

52 minutes ago, ArmamentHaki said:

par2 is probably a parameter.

Spoiler

 

A Vector is a list of three numbers. It has an X value, a Y value, and a Z value. In Minecraft, X, Y, and Z refer to the position a block/tile/entity is located at.

So if you have a Vector and desire a BlockPos, you can create a BlockPos with a vector via

new BlockPos(Vector)

Draco referenced the rayTrace function.

You can use the EntityPlayer rayTrace to find the Vector (Block Position) that the play is currently looking at.

So you can use

RayTraceResult rayResult = playerIn.rayTrace(howFarThePlayerCanReachinBlocks, partialTicksnotSurewhatthisIs);
BlockPos lookingPosition = new BlockPos(rayResult.hitVec);
// Summon your lightning at lookingPosition

I haven't tested but if that doesn't work try adding the hitVec to the player position like this:

BlockPos lookingPosition = rayResult.hitVec.add(player.getPositionVector());

 

Pursue your modding course and make sure you understand Java and not just Minecraft code.

Java is a useful skill and a powerful tool.

32 minutes ago, hiotewdew said:

RayTraceResult rayResult = playerIn.rayTrace(howFarThePlayerCanReachinBlocks, partialTicksnotSurewhatthisIs);

Partial Ticks is what fraction of a game-tick the current render frame is on (if the game runs at 20 ticks a second and the application is rendering at 60 frames a second, then each frame is 0.3333 of a tick). Partial ticks only make sense client side, so please double check that that rayTrace method is not marked @SideOnly(Side.CLIENT)

43 minutes ago, Draco18s said:

Partial Ticks is what fraction of a game-tick the current render frame is on (if the game runs at 20 ticks a second and the application is rendering at 60 frames a second, then each frame is 0.3333 of a tick). Partial ticks only make sense client side, so please double check that that rayTrace method is not marked @SideOnly(Side.CLIENT)

 @Nullable
    @SideOnly(Side.CLIENT)
    public RayTraceResult rayTrace(double blockReachDistance, float partialTicks)
    {
        Vec3d vec3d = this.getPositionEyes(partialTicks);
        Vec3d vec3d1 = this.getLook(partialTicks);
        Vec3d vec3d2 = vec3d.addVector(vec3d1.x * blockReachDistance, vec3d1.y * blockReachDistance, vec3d1.z * blockReachDistance);
        return this.world.rayTraceBlocks(vec3d, vec3d2, false, false, true);
    }

This is the method...

46 minutes ago, Draco18s said:

so please double check that that rayTrace method is not marked @SideOnly(Side.CLIENT)

Just now, hiotewdew said:

@SideOnly(Side.CLIENT)

...

So you have to convert the method to some sort of format that excludes partial ticks so it can run serverside.

4 hours ago, Draco18s said:

There's a raytrace method in the World class that will work (look for a method that returns MovingObjectPosition)