[Solved][1.6.4]Gun projectile problem.

[Naiten]

So, here's the code for my projectile and part of the cannon code that launches the projectile.

public class Shot_2 extends Entity{

public Shot_2(World par1World) {
	super(par1World);
	this.setSize(0.125F, 0.125F);
	this.entityCollisionReduction = 0.5F;
}

@Override
public void onUpdate(){
	this.onEntityUpdate();
}

@Override
public void onEntityUpdate(){
	this.prevDistanceWalkedModified = this.distanceWalkedModified;
	this.prevPosX = this.posX;
	this.prevPosY = this.posY;
	this.prevPosZ = this.posZ;
	this.prevRotationPitch = this.rotationPitch;
	this.prevRotationYaw = this.rotationYaw;
	this.motionX *= 0.95;
	this.motionY *= 0.95;
	this.motionZ *= 0.95;

	if(this.posY < -64.0D){
		this.kill();
	}
	this.addVelocity(0, -0.004D, 0);
	this.doBlockCollisions();
	int i = MathHelper.floor_double(posX);
	int j = MathHelper.floor_double(posY);
	int k = MathHelper.floor_double(posZ);

	if(worldObj.getBlockId(i, j, k) > 0){
		worldObj.createExplosion(this, this.posX, this.posY, this.posZ, 4.0F, true);
	}

	this.posX += this.motionX;
	this.posY += this.motionY;
	this.posZ += this.motionZ;
	this.setPosition(this.posX, this.posY, this.posZ);
}

public boolean canBeRidden(){
	return false;
}

@Override
protected void playStepSound(int par1, int par2, int par3, int par4){
}

@Override
public AxisAlignedBB getCollisionBox(Entity par1Entity){
	if(par1Entity != riddenByEntity && par1Entity.ridingEntity != this){
		return this.boundingBox;
	}
	return null;
}

@Override
public AxisAlignedBB getBoundingBox(){
	return this.boundingBox;
}

@Override
public boolean canBeCollidedWith(){
	return false;
}

@Override
public boolean canBePushed(){
	return false;
}

@Override
protected void readEntityFromNBT(NBTTagCompound nbttagcompound){
}

@Override
protected void writeEntityToNBT(NBTTagCompound nbttagcompound){
}
}

public void onEntityUpdate(){
	...
	if(shoot){
		if(shooting == 0){
			if(worldObj.isRemote){
				for(byte i = 0; i < 23; i++){
					muzzlePos.onUpdate();
					worldObj.spawnParticle("explode", muzzlePos.getX(), muzzlePos.getY(), muzzlePos.getZ(), 0, 0, 0);
				}
			}
			worldObj.playSoundAtEntity(this, "row:howitzer_shot", 1.0F, 1.0F);

			Shot_2 shot = new Shot_2(worldObj);
			shot.setLocationAndAngles(...);
			shot.addVelocity(...);
			worldObj.spawnEntityInWorld(shot);
		}

	}
}

The problem is next — blocks are destroyed only in client world. After I save/load, all damaged blocks are restored. Any ideas how to fix this?

[larsgerrits]

You are spawning the entity in the world client-side.

[Naiten]

You are spawning the entity in the world client-side.

No, i'm spawning it in both sides. I only spawn effects on client.

[coolAlias]

You are spawning the entity in the world client-side.

No, i'm spawning it in both sides. I only spawn effects on client.

That's the point: don't spawn it on the client, that happens automatically. Same for explosions and destroying blocks - only do that on the server side or you will encounter these "ghost" blocks. The client is updated automatically when blocks are destroyed.

[Naiten]

Idk what was this caused by, but after i re-wrote the code in another way, the problem disappeared.