Vector question

[YouGroove]

I have two 3D points in space :

- begin

- end

 

I want to move bullet using collision with PhysicsSetPosition(x,y,z, force) from start 3D position to end 3D position.

And for example moving 0.2 step eahc step with that vector.

 

How to code that with maths ?

[Guppy]

Since the two positions can be thought og as vectors from origo:

 

Normalize(A-B)*0.2

[YouGroove]

ok great.

So in Lua i do

C.x = A.x - B.x

C.y = A.y - B.y

C.z = A.z - B.z

C.normalize() * 0.2

 

Thanks Guppy.

[YouGroove]

Didn't worked so well.

 

If someone have Lua code i'm interested.

[Guppy]

Maybe you have it the wrong way round?

In that case every step when you multiply c by step you would have the bullet flying in the wrong direction.

 

if that's not the issue I'm going to need some more details

[YouGroove]

I have done B-A

But i got Normalize or Transform:Normal()

Well let's wait for some super math coder to give the Lua code response.

[YouGroove]

Yep, i find same explication , it should work.

http://xnafan.net/2012/12/pointing-and-moving-towards-a-target-in-xna-2d/