Custom hitbox for my mob

[WorldsEnder]

I want to add a custom hitbox for my mob. Not this BoundingBox to define when the mob is been pushed but the hitbox which defines when the mob is being damaged.

I think nobody needs more to know?

In advance

Me

[Draco18s]

The bounding box is the hitbox.  Minecraft doesn't distinguish between them as far as I know.

 

For blocks there's a separate bounding box (where the player runs into it) and hit box (where the mouse can highlight the block), but this has to do with blocks that the player can walk through needing a collision box for interactions separate from the physics.

[WorldsEnder]

So I just override getBoundingBox() ?

cause I tried that out and it did nothing... :

@Override
public AxisAlignedBB getBoundingBox() {
	return AxisAlignedBB.getBoundingBox(0, 0, 0, 0, 0, 0);
}

[Draco18s]

No idea.

 

All I know about is this.setSize(width, height);

[ObsequiousNewt]

I don't think it will work if you pass 0 to every argument. I also think there's another function you need to override: getCollisionBox(Entity). Alternatively, you could try modifying the field this.boundingBox. I'd be glad to help, though, as I need the answer to this problem myself.

[WorldsEnder]

Right at the start: this.boundingBox is final I didn't know the getCollisionBox() method so I will try it

After trying it out I'm gonna report the result in this thread.

[WorldsEnder]

Okay, I've found critical point of code that leads us to no control over this thing...:

EntityRenderer: line 304ff.

                        float f2 = entity.getCollisionBorderSize();
->                     AxisAlignedBB axisalignedbb = entity.boundingBox.expand((double)f2, (double)f2, (double)f2);
                        MovingObjectPosition movingobjectposition = axisalignedbb.calculateIntercept(vec3, vec32);

                        if (axisalignedbb.isVecInside(vec3))
                        {
                            if (0.0D < d2 || d2 == 0.0D)
                            {
                                this.pointedEntity = entity;
                                d2 = 0.0D;
                            }
                        }
                        else if (movingobjectposition != null)
                        {
                            double d3 = vec3.distanceTo(movingobjectposition.hitVec);

                            if (d3 < d2 || d2 == 0.0D)
                            {
                                this.pointedEntity = entity;
                                d2 = d3;
                            }
                        }

This leads us to the problem. As a modder I don't know how to influence the entity.boundingBox as it is declared final in Entity...

I am not used to make a request so if one of you is more experienced in requesting something from the dev-team, pls do it. All they have to do is to swap this special line of code from entity.boundingBox to entity.getBoundingBox() or entity.getCollisionBox(). Either of them would do fine.

[SanAndreaP]

The entity.boundingBox is final, but you can alter it in your constructor. As a standard, it's initialized with an AABB with "no box" (look at Entity.java, line 253)

So if you don't alter it, you can just override getCollisionBorderSize()  and return anything you wish.

[ObsequiousNewt]

Or: this.boundingBox.setBounds(minX,minY,minZ,maxX,maxY,maxZ);

[WorldsEnder]

So I did this:

public EntityFelyne(World par1World) {
	super(par1World);
	this.boundingBox.setBounds(0D, 0D, 0D, 0D, 0D, 0D);
}

@Override
public AxisAlignedBB getCollisionBox(Entity par1Entity) {
	return boundingBox;
}

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

Still, when I enter debug mode.... box[-33.80000001192093, 66.0, 140.19999998807907 -> -33.19999998807907, 67.79999995231628, 140.80000001192093]; and this is totally the zone I can hit the entity in. Anything you wanna say about this?

[ObsequiousNewt]

  On 6/10/2013 at 4:18 PM, WorldsEnder said:

So I did this:

public EntityFelyne(World par1World) {
	super(par1World);
	this.boundingBox.setBounds(0D, 0D, 0D, 0D, 0D, 0D);
}

@Override
public AxisAlignedBB getCollisionBox(Entity par1Entity) {
	return boundingBox;
}

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

Still, when I enter debug mode.... box[-33.80000001192093, 66.0, 140.19999998807907 -> -33.19999998807907, 67.79999995231628, 140.80000001192093]; and this is totally the zone I can hit the entity in. Anything you wanna say about this?

You're setting all the bounds to 0... it seems doubtful that that would work...

 

Also, apparently setPosition(x,y,z) changes the bounding box... according to the "width" and "height". So you'll have to override that too.

[WorldsEnder]

I've overridden setPosition:

/EDIT wrong solution:

 

  Reveal hidden contents

@Override
public void setPosition(double par1, double par2, double par3) {
	AxisAlignedBB b = this.boundingBox;
                double minFromPosx = this.posX - b.minX;
                double minFromPosy = this.posY - b.minY;
                double minFromPosz = this.posZ - b.minZ;
                double maxFromPosx = b.maxX - this.posX;
                double maxFromPosx = b.maxY - this.posY;
                double maxFromPosx = b.minZ - this.posZ;
	this.posX = par1;
	this.posY = par2;
	this.posZ = par3;
                this.boundingBox.setBounds(posX - minFromPosx, posY - minFromPosy , posZ - minFromPosz, posX + maxFromPosx, posY + maxFromPosy, posZ + maxFromPosz);
}

 

it doesn't really work at all...  Now I have weird glitches were the entity is not where it belongs to and I can't really explain why

 

EDIT: fixed it, works fine now

EDIT2: I did not tell the truth... it does not work all the time... will inspect that

EDIT3: finally... I found a solution to keep the boundingBox centered on your entity (at least x and z -axis). No more wishes I guess:

@Override
public void setPosition(double par1, double par2, double par3) {
	AxisAlignedBB b = this.boundingBox;
	double boxSX = b.maxX - b.minX;
	double boxSY = b.maxY - b.minY;
	double boxSZ = b.maxZ - b.minZ;
	this.boundingBox.setBounds(posX - boxSX/2D, posY, posZ - boxSZ/2D, posX + boxSX/2D, posY + boxSY, posZ + boxSZ/2D);
}

[ObsequiousNewt]

So, it works completely now? Right? Or is it still broken?

[WorldsEnder]

Works all fine, I tested it and I found no glitches/bugs or anything

 

If YOU find and don't fear to post them, I'll see what I did wrong. Also a non-centered BB would be easy with 3 new vars (I am sure you know how to if youu know a bit of prgramming).

[ObsequiousNewt]

Thanks given! Now I just need to figure out how to control my entity with the keyboard...

[java coder123]

so i am pretty new at coding and I really want to implement this in my mod,  but I don't understand what I should put in for all the Variables

[Turtledove]

  On 4/28/2020 at 8:46 PM, java coder123 said:

so i am pretty new at coding and I really want to implement this in my mod,  but I don't understand what I should put in for all the Variables

Expand  

this is a post from 7 years ago, use the latest versions of Forge and start your own thread. 

 

And if you don't know Java, learn that first before diving into Forge, this isn't a forum for learning Java.