Arcing homing projectiles

[williewillus]

Hello all.

 

I'm trying to finish the ProjectE homing arrows. They currently have a crap linear "point directly at target and go there", but I want something that's pretty and arcs towards the target.

 

I'm fuzzy on how projectiles in Minecraft work, but I'm gonna try to bump the rotationPitch and rotationYaw so the arrow faces correctly.

 

I've read some pages online, but currently have no idea where to go.

 

What I have so far:

[*]Get the arrow's position vector

[*]Get the target's position vector

[*]Subtract the two vectors to gain the one that points directly from the arrow to the target

 

I need to find a way to rotate the arrow vector onto this vector (someone says cross product and axis-angle rotation), but the problem is.... how do I apply this back to Minecraft? Need to find how to bump the rotation and pitch, and how to reset the arrow's velocity vector. At a loss here, and some explanations and sample (pseudo)code would be nice

 

My trigonometry and vector calculus are extremely weak, so please explain your reasoning if you give me sample code.

[coolAlias]

Once you have the direct target vector, you can find the difference between the current trajectory and the target vector and apply a portion of that to the current trajectory, e.g.:

double arcRate = 0.25D;
double dx = current.xCoord - target.xCoord;
current.xCoord += dx * arcRate;

Something like that anyway - I'm just typing off the top of my head here.

[Draco18s]

Check out this article, the section titled "Adding Realistic Turns."