Question Can't set the correct rotation for a bullet

Hi everyone,

I'm creating a weapon script for a FPS. To create the spread of the bullets I'm picking random points in a circle with the center at a specified distance from the world forward. Then I rotate those points to aim at where the player is looking towards. It works perfectly fine while the Z is 0, increasing the rotation causes the bullets to stop going in the camera's direction.

This is the code for the spread of each bullet shoot.

Code (CSharp):

1. Vector3 efectiveRangePoint = Vector3.forward * advancedSettings.effectiveRange;
2.  
3.  
4. efectiveRangePoint = efectiveRangePoint + (Vector3)UnityEngine.Random.insideUnitCircle * (advancedSettings.spreadRadius);
5.  
6.  
7. Quaternion rotationInUp = Quaternion.AngleAxis(transform.rotation.eulerAngles.y, Vector3.up);
8.  
9. Quaternion rotationInRight = Quaternion.AngleAxis(cameraHolderTransform.localEulerAngles.x + recoilTransform.localEulerAngles.x + transform.rotation.eulerAngles.x, rotationInUp * Vector3.right);
10.  
11. Quaternion rotationInForward = Quaternion.AngleAxis(transform.rotation.eulerAngles.z, rotationInUp *rotationInRight * Vector3.forward);
12.  
13. Vector3 finalPoint = rotationInUp * efectiveRangePoint;
14.            
15.  
16. finalPoint = rotationInRight * finalPoint;
17.  
18. finalPoint = rotationInForward * finalPoint;
19.  

This is the hierarchy of the Player:

• Player contains the Weapon script.
• CameraRot contains the script to rotate the camera that rotates itself in X to look up and down, and the Parent around Y. (the cameraHolderTransform in the script above)
  
• CameraRecoil contains a Recoil script that rotates in X itself to add extra rotation for each shoot. (the recoilTransform in the script above)

Thanks in advance!

 

I have no idea what all that is.

Shoot straight ahead with

Code (csharp):

1. Vector3 direction = gunTransform.forward;

Spray randomly with:

Code (csharp):

1. Vector3 direction = gunTransform.forward + Random.insideUnitCircle * BulletRandomness;

EDIT: My bad... Substitute Random.onUnitCircle above...

Where BulletRandomness might be:

Code (csharp):

1. float BulletRandomness = 0.02f;

 

If you want to randomize the direction, I would just do this:

Code (CSharp):

1. Vector3 dir = [pick a normalized direction];
2. dir += Random.onUnitSphere * 0.1f;
3. dir = dir.normalized;

This will add a little bit of randomness to the vector, then turn it back into a unit vector.

...bah, you beat me to it while I was typing this!

 

Yours is better because you normalized it.

 

Hi, thanks for your reply. But that would not work because Random.insideUnitCircle return only values in X and Y so will end up with something like this unless you are facing Vector3.forward.



This is the result of a shoot using your code, that's why the rotations are needed if using Random.insideUnitCircle, but using Random.insideUnitySphere solves all problems as chemicalcrux said.

 

Fu**, I was so focused on the rotations that I didn't think that using a sphere would be almost the same in the end. The final code that works for me is this.

Code (CSharp):

1. Vector3 efectiveRangePoint = cam.transform.forward * advancedSettings.effectiveRange;
2.  
3. efectiveRangePoint = efectiveRangePoint + (Vector3)UnityEngine.Random.insideUnitCircle * (advancedSettings.spreadRadius);

Being efectiveRangePoint the destination point where the Raycast of a single bullet would be directed torwards.

Thanks a lot!!!