How does Vectors work in Minecraft?

Hello,

I've been trying to get Vector's work in Minecraft for like hour's now, And It justs doesn't do what I want and if I change something I just don't know what I exactly did.

Entity's have Vectors right? It's like the place where they are going and how fast. That's what I understand. But it's different with every YAM position or something like that.

I want for example a Entity to go to the location a player is looking at. I found somewhere this code that I change a little:

Code:

	        if ((yaw <= 38) || (yaw >= 320))
	        {
	        	side = yaw/100;
	        	tnt2.setVelocity(new Vector(0.0D, 0.8D, 0.5D));
//Angle, if not straight? - Height? - Speed?
	        }
	        else if ((yaw >= 216) && (yaw < 320))
	        {
	        	side = yaw/100;
	        	tnt2.setVelocity(new Vector(1.0D, 0.8D, 0.0D));
//Speed, Height?, Angle
	        }
	        else if ((yaw >= 143) && (yaw < 216))
	        {
	        	side = yaw/100;
	        	tnt2.setVelocity(new Vector(0.0D, 0.8D, -1.0D));
//Angle, Height?, Speed
	        }
	        else
	        {
	        	side = yaw/100;
	        	tnt2.setVelocity(new Vector(-0.5D, 0.8D, 0.0D));
//Speed, Height?, Angle
	        }

I found out that the second argument is the height. How high it spawn's.
And the others are different based on the YAW of where the player is looking.

I hope that someone can explain how those Vector's work in detail.

Greetings, WMisiedjan

 

the vectors in this case represent speeds in the X, Y and Z directions
X= North/South
Y = Up/Down
Z = East/West

It looks like you're trying to convert yaw/pitch/speed into X/Y/Z?
(This is a conversion from spherical polar coordinates to Cartesian coordinates if you want to look up the maths)

Use the following formulae:

Code:

double yaw = Math.toRadians(player.getLocation().getYaw()+90);
double pitch = Math.toRadians(-player.getLocation().getPitch());

double x = v*Math.cos(yaw)*Math.cos(pitch)
double y = v*Math.sin(pitch)
double z = v*Math.sin(yaw)*Math.cos(pitch)

tnt2.setVelocity(new Vector(x,y,z))

(where v is the speed you want the tnt to go)

 

Wo0w! I would never figure that out by myself! Thanks!

 

Oh, you'll need to swap y and z around. Sorry.
I've corrected the code in my last post.

 

Hmh, I tried this. But the TNT is still not going to where the player is looking at. I can send you my whole command if you want? And you can try it out on my server.

Edit: Didn't saw your new code, Checking it out now.
Still acting weird. Can you take a look?

 

Just use the old 'HitBlox' file from hmod

 

The Location class has a method that returns a direction vector

Code:

Location loc = player.getLocation();
Vector facing = loc.getDirection();

This returns a unit vector pointing in the direction the player is facing. You don't have to do the pitch/yaw calculations manually.

 

.....

Mind blown.

 

Code:

TNTPrimed tnt = player.getEyeLocation().getWorld().spawn(
                player.getEyeLocation(), TNTPrimed.class);
        Vector direction = player.getEyeLocation().getDirection().multiply(2.5);
        tnt.setVelocity(direction);

Code directly from my plugin