Hi,

i created a weapon firing multiple rockets in a row. But, since they explode, the later rockets are misdirected by the explosion. I assume it has something to do with knockback but I couldn't find where I set the resistance to it. Or maybe it can be done with something else. Any help is appreciated.

 

EDIT:

It seems to be a problem with getGravityVelocity() returning 0. With a very small value (0.005) the rockets are no longer affected by the explosion (or I cant see it). Still, if someone ones why this happens would be great.

 

McRaichu

 

Could I see your code for your rocket entity?

here you go:

package net.McRaichu.LittleWalker.weapons;

import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.projectile.EntityThrowable;
import net.minecraft.util.DamageSource;
import net.minecraft.util.MathHelper;
import net.minecraft.util.MovingObjectPosition;
import net.minecraft.world.World;


public class EntityRocket extends EntityThrowable
{

float explosionRadius;
public float speed;
private byte damage;
int ticksAlive = 0;

private void initRocket()
{
	explosionRadius = 1.5F;
	speed = 1.0F;
	damage = 10;
	setThrowableHeading(this.motionX, this.motionY, this.motionZ, speed, 1.0F);		
}

public EntityRocket(World par1World)
{
	super(par1World);
	initRocket();
}

public EntityRocket(World par1World, EntityLivingBase entity)
{
	super(par1World, entity);
	initRocket();
}

public EntityRocket(World par1World, double par2, double par4, double par6)
{
	super(par1World, par2, par4, par6);
	initRocket();
}

public EntityRocket(World par1World, EntityLivingBase entity, double par7, double par8, double par9)
{
	super(par1World, entity);
	this.posX -= (double)(MathHelper.cos(this.rotationYaw / 180.0F * (float)Math.PI) * par7);
	this.posY -= par8;
	this.posZ -= (double)(MathHelper.sin(this.rotationYaw / 180.0F * (float)Math.PI) * par9);
	this.setPosition(this.posX, this.posY, this.posZ);
	initRocket();
}

@Override
protected void onImpact(MovingObjectPosition par1MovingObjectPosition)
{
	if(par1MovingObjectPosition.entityHit != null){
		if (this.getThrower().ridingEntity == par1MovingObjectPosition.entityHit) {
			return;
		}
		par1MovingObjectPosition.entityHit.attackEntityFrom(DamageSource.causeThrownDamage(this, this.getThrower()), damage);
	}
	this.worldObj.createExplosion(this, this.posX, this.posY, this.posZ, (float)this.explosionRadius, true);
	this.setDead();

}

@Override
protected float getGravityVelocity() 
{
	return 0.0005F;
}

@Override
public void onUpdate()
{
	super.onUpdate();

	ticksAlive++;
	if(ticksAlive > 200)
	{
                        this.worldObj.createExplosion(this, this.posX, this.posY, this.posZ, (float)this.explosionRadius, true);
		setDead();
	}

	if(worldObj.isRemote)
	{
		for(int i = 0; i < 4; i++)
		{
			worldObj.spawnParticle("smoke", posX, posY, posZ + motionZ, -motionX, -motionY , -motionZ);
		}
	}
}
}

Your problem, is that the gravity system in EntityThrowable behaves like that naturally, in order to get your rockets to behave in the manner you speak of, you will need to create a custom entity that implements IProjectile. (At least I think, if someone more experienced says otherwise, than ignore what I am saying, I don't do much with entities )

To prevent your rockets from being affected by the explosion of other rockets, you simply need to handle the ExplosionEvent.Detonate event. In that event a list is passed in as a parameter that contains all entities that are in range of the explosion. You can simply remove your rockets from the list (if any are there) and they won't be affected.

To prevent your rockets from being affected by the explosion of other rockets, you simply need to handle the ExplosionEvent.Detonate event. In that event a list is passed in as a parameter that contains all entities that are in range of the explosion. You can simply remove your rockets from the list (if any are there) and they won't be affected.

 

I thought the Explosion Events were added recently to Forge for 1.8.  If that's accurate, it won't help for 1.7.10.

To prevent your rockets from being affected by the explosion of other rockets, you simply need to handle the ExplosionEvent.Detonate event. In that event a list is passed in as a parameter that contains all entities that are in range of the explosion. You can simply remove your rockets from the list (if any are there) and they won't be affected.

 

I thought the Explosion Events were added recently to Forge for 1.8.  If that's accurate, it won't help for 1.7.10.

 

It was also added to 1.7.10 but you need to update your forge to 1299 or later.

 

They are still updating Forge for 1.7.10. They're up to 1389 now...