Question How to make a projectile spreading effect for topdown?

In the context of a topdown shooter. The origin of where the projectiles are determined. Ideally I would like to not have to use rotations via eulers but am willing to if need be. Im struggling with two things at the moment.

1. Creating a formula which can deal with spread factor based on the amount of projectiles as displayed above. If it is an odd number, the first bullet should start in the middle. If it's not an odd number the bullet should start at half of what the spread factor is from the top. That's my logic at the moment but all of them come out at the same time. Maybe its better to look into using Unity's Particle system for this instead? I plan on doing more than just bullets with the projectiles though like homing missiles,lasers and pools of lava.
2. Determining how they move without forcing a rotation. The easiest way is to make it rotate in the direction its moving and just make it go transform.right but I was wondering if theres a way to just make it move in a set direction.

 

Multiply Vector3s by a Quaternion to rotate them.

Code (csharp):

1. // bend it 45 degrees around +Z vector
2. Vector3 bentVector = Quaternion.Euler( 0, 0, 45) * originalVector;

EDIT: here's more of an example going around a full circle:

https://github.com/kurtdekker/makeg...ProcGenStuff/SpawnInACircle/SpawnInACircle.cs

MakeGeo is presently hosted at these locations:

https://bitbucket.org/kurtdekker/makegeo

https://github.com/kurtdekker/makegeo

https://gitlab.com/kurtdekker/makegeo

https://sourceforge.net/p/makegeo

 

Code (CSharp):

1.     void SpawnBullets(int count)
2.     {
3.         for (int i=0;i<count;i++)
4.         {
5.             Quaternion startRot=Quaternion.AngleAxis((-10*(count-1)+(i*20)),Vector3.up);
6.             GameObject b=Instantiate(bulletPrefab,transform.position,startRot*transform.rotation);
7.             b.GetComponent<Rigidbody>().AddForce(b.transform.forward*10,ForceMode.Impulse);
8.         }
9.     }

 

thank you ill try this out

 

yes this is using transform.forward though i would like to control the direction rather than making it go off its rotation.