Help with unusual projectile behavior

[Adil Yilan]

I have implemented RpgLauncherItem that launches RpgEntity.

This is how it works at the moment:

https://vimeo.com/user167486120/review/680142871/22206a0362

I have modeled RPG and RPG launcher in BlockBench and imported them as JSON assets in mod.

RpgEntity is using GeckoLib for animation, although there is none at the moment.

There are 4 issues on the video above:

a) RPG is launched from the feet instead from the eye point - what would be the proper way to set shooting point?

b) When launcher is used, it looks as if it is trying to hit the ground - can this animation be disabled?

c) Sometimes, RPG goes in totally different direction than the crosshair is targeting - is this related to client/server communication and can that be improved?

d) As you can see in the video, RPG is spinning while moving - I have no clue why - haven't added that as an animation any way to prevent this from happening?

 

This is RpgEntity code:
 

public class RpgEntity extends AbstractHurtingProjectile implements IAnimatable {

    // GeckoLib
    private final AnimationFactory factory = new AnimationFactory(this);
    
    public RpgEntity(EntityType<RpgEntity> entityType, Level level) {
        super(entityType, level);
    }
    
    public RpgEntity(EntityType<RpgEntity> entityType, LivingEntity player, Level level) {
        super(entityType, player, player.getViewVector(100).x(), player.getViewVector(100).y(), player.getViewVector(100).z(), level);
    }

    public static EntityType<RpgEntity> createType() {
        
        Builder<RpgEntity> builder = Builder.of((EntityType.EntityFactory<RpgEntity>)RpgEntity::new, MobCategory.MISC);

        builder.sized(0.5F, 0.5F);
        builder.clientTrackingRange(4);
        builder.updateInterval(20);
        
        EntityType<RpgEntity> entityType = builder.build("rpg");

        return entityType;
    }

    @Override
    protected void onHitEntity(EntityHitResult pResult) {
        super.onHitEntity(pResult);
        this.level.explode(this, this.getX(), this.getY(), this.getZ(), 5.0f, false, BlockInteraction.BREAK);
        this.discard();
    }

    @Override
    protected void onHitBlock(BlockHitResult pResult) {
        super.onHitBlock(pResult);
        this.level.explode(this, this.getX(), this.getY(), this.getZ(), 5.0f, false, BlockInteraction.BREAK);
        this.discard();
    }

    @Override
    public Packet<?> getAddEntityPacket() {
        return NetworkHooks.getEntitySpawningPacket(this);
    }

    @Override
    public void registerControllers(AnimationData data) {
        data.addAnimationController(new AnimationController<RpgEntity>(this, "controller", 0, this::predicate));
    }

    // GeckoLib
    @Override
    public AnimationFactory getFactory() {
        return this.factory;
    }

    // GeckoLib
    private <E extends IAnimatable> PlayState predicate(AnimationEvent<E> event) {
        return PlayState.CONTINUE;
    }
}

 

 

This is RpgLauncherItem code:

public class RpgLauncherItem extends Item {

	public RpgLauncherItem() {
		super(createProperties());
	}

	private static Properties createProperties() {
		Properties properties = new Properties();
		properties.tab(CreativeModeTab.TAB_COMBAT);
		properties.stacksTo(1);
		return properties;
	}

	@Override
	public InteractionResultHolder<ItemStack> use(Level pLevel, Player pPlayer, InteractionHand pUsedHand) {
		
		ItemStack item = pPlayer.getItemInHand(pUsedHand);
		
		if (pLevel.isClientSide()) {
			return InteractionResultHolder.sidedSuccess(item, true);
		}

		RpgEntity rpg = new RpgEntity(ProjectileEntities.RPG.get(), pPlayer, pLevel);
		pPlayer.level.addFreshEntity(rpg);

		return InteractionResultHolder.sidedSuccess(item, true);
	}
}

 

Any suggestions on how issues above could be resolved would be really appreciated.

I am new to all this and getting rocket to fire properly was already a challenge.

 

Edited February 21, 2022 by Adil Yilan