# Getting Points On A Line Between 2 Vectors

Discussion in 'Physics' started by steviebob, Feb 1, 2015.

1. ### steviebob

Joined:
Jul 15, 2014
Posts:
21
Hi Guys,
How can you get the coordinates in a line between 2 points?
e.g. suppose I have 2 points and want to get a vector3 every x units in a straight line from 1 to the other, how would I go about this?

The purpose is so I can draw a path by putting textures down at the points along the line between the 2 points (Not sure if this is the right way to do it or not ?).

Once I've had a bit more practice, I'll make fancier curved paths, but for now I need to stick to the simple bits (Presumably what I end up learning from this post would still be applicable).

2. ### Uberpete

Joined:
Jan 16, 2014
Posts:
78
Okay, time to take a trip back to middle-school maths First, say we have two vectors, A and B

Code (CSharp):
1. Vector3 a;
2. Vector3 b;
You'd first want to get the vector between the points:

Code (CSharp):
1. Vector3 lineWeWant = b-a;
Now, divide the vector by the amount of points you want (say, x points) and then run that through a for-loop:

Code (CSharp):
1. int x = 23; // I WANT 23 POINTS
2. GameObject pointPrefab; //some random prefab
3.
4. for (int i =0; i <x; i++){
5.
6. Instantiate (pointPrefab, a + (lineWeWant/x * i), transform.rotation);
7.
8. }
Hope this helps chelnok likes this.
3. ### steviebob

Joined:
Jul 15, 2014
Posts:
21
ahhh, you're a star, thank you very much.
I know this is probably something I learned in school (I was almost too embarrassed to post the question) but I couldn't find a simple answer with my googleFoo.

There was 1 more thing that I'd like to know.
How can I supply a Vector3 and determine whether or not it is somewhere along the line between 2 points?

Can you point me to any resources where I can do some additional reading?

Joined:
Jul 15, 2014
Posts:
21
5. ### Uberpete

Joined:
Jan 16, 2014
Posts:
78
Took a quick glance, looks like it should. If not, feel free to PM me - I've just done the topic at school so its definitely fresh in my mind XD