[1.15] How to set direction of fireball?

[gamas]

Hi I am trying to shoot fireball from my custom axe when I click the right click on my mouse. I am able to do so, but I am not able to set the direction of the fireball properly

 

Every time the fireball launch, it appears in front of the player which is good, but not in the direction of the center target cursor. It randomly changes the direction. Sometimes it appear on the left, or below or above or to the right on the target cursor in front of me. I want the fireball's direction to be exactly at the target cursor in front of me. I want the fireball direction to be like when I am shooting an arrow. What am I missing?

 

package com.mycompany.firstmod.item;

import com.mycompany.firstmod.init.ModItemGroup;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.entity.projectile.FireballEntity;
import net.minecraft.item.*;
import net.minecraft.util.ActionResult;
import net.minecraft.util.Hand;
import net.minecraft.util.math.Vec3d;
import net.minecraft.world.World;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

public class CustomAxe extends AxeItem {
    public static final Logger LOGGER = LogManager.getLogger(CustomAxe.class);
    public int fireballStrength = 9;
    public CustomAxe() {
        super(ItemTier.IRON, 6.0F, -3.1F, new Item.Properties().group(ModItemGroup.MOD_ITEM_GROUP));
    }
    public CustomAxe(IItemTier tier, float attackDamageIn, float attackSpeedIn, Item.Properties builder) {
        super(tier, attackDamageIn, attackSpeedIn, builder);
    }

    public ActionResult<ItemStack> onItemRightClick(World world, PlayerEntity player, Hand handIn) {

        Vec3d looking = player.getLookVec();
        FireballEntity fireballentity = new FireballEntity(world, player,looking.x,looking.y,looking.z);
        LOGGER.info(String.format("%s, %s, %s", looking.x, looking.y, looking.z));

        fireballentity.explosionPower = fireballStrength;
        world.addEntity(fireballentity);

        LOGGER.info("********** Magic Axe swing **************");
        return super.onItemRightClick(world, player, handIn);
    }

}

 

[Draco18s]

I wonder how the Ghast does it.

[gamas]

That's a good idea @Draco18s ?. Below is the GhastEntity source code that I can see. But the code assumes that it has a target entity position (livingentity). But in my case, I don't have a target entity position ?

 

Edited February 26, 2020 by DaemonUmbra
Removed Mojang Code

[DavidM]

40 minutes ago, gamas said:

That's a good idea @Draco18s ?. Below is the GhastEntity source code that I can see. But the code assumes that it has a target entity position (livingentity). But in my case, I don't have a target entity position ?

 

That code is only using the target entity as the target position. You can just use your own target position.

[Draco18s]

Which you can calculate from the player's position and look vector.

[gamas]

On 2/18/2020 at 6:44 AM, Draco18s said:

Which you can calculate from the player's position and look vector.

How would I do that @Draco18s, @DavidM if I don't have any real target? When you said target, do you mean a real entity (mob or living entity) that I want to target? Ideally, I just want the fireball to go in the direction of the center cursor?  But I don't know how to get the position of the center cursor? 

 

In general, I don't quite understand the concept of player look vector ? . I wonder if there is documentation about this?

Vec3d looking = player.getLookVec()

Edited February 25, 2020 by gamas

[Alpvax]

The look vector is a vector (with a length/magnitude of 1) pointing in the direction the entity is looking.

So the direction/velocity of your fireball should be a multiple of that vector, and the start position should be the player eye position, plus part of the look vector (to spawn just in front of the player, instead of inside it's face)

Edited February 25, 2020 by Alpvax

[Draco18s]

Mm, vector math. <3