Make a side of an object LookAT another object

Question

Basicly I have 2 ships, one is controlled by the player and the other by the computer.

I have a script where the AI Ship rotates towards the player and starts moving towards him. But, once within firing range, it needs to rotate around 90 degrees left or right so that the cannons on either side can have a shot and that is where i've been having difficulty.

I've tried multiple methods but none have worked, seems that i'll never understand Quaternions.

 else if(Vector3.Distance(transform.position, player.position) < firingRange && Vector3.Distance(transform.position, player.position) > retreatDistance)    //If in firing range
 {
     //stop moving
     transform.position = this.transform.position;
 
     //rotate & fire    
     Vector3 fireAngle =  transform.rotation * new Vector3(0,90,0);      //add 90 degrees on Yaxis
     Quaternion rotation = Quaternion.LookRotation(fireAngle);
     transform.rotation = Quaternion.Lerp(transform.rotation, rotation, turnSpeed + Time.deltaTime);
 }

Any help would be greatly appreciated as I've been stuck in this part for way too long

Answer 1

Answer by ShadyProductions · Apr 18, 2019 at 12:54 PM

Hello,

You can grab the direction of the target, and then set the side of your ai ship to point at the direction.

 var direction = (target.transform.position - aiShip.transform.position).normalized;
 // Set the right side to point at the direction    
 aiShip.right = direction; // You could slerp this to make the transition more smooth instead of instant

You'll have to rotate to left or right based on which side is the fastest to turn towards the target. I assume you could use Dot product for this.

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Saif_youssef89 · Apr 19, 2019 at 06:21 AM 0

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Thank you so much for your help @ShadyProductions!

It worked almost as intended, like you mentioned, I need to Lerp the last statement for a smoother transition.But Quaternions are my weakness and i could never figure them out for life of me (Always sucked at $$anonymous$$ath). I've been trying to get the Lerp working, this is what i got so far:

 Vector3 fireDirection = (player.transform.position - transform.position).normalized;
 Quaternion rotation = Quaternion.LookRotation(firedirection);
 transform.right = Quaternion.Lerp(transform.rotation, rotation, turnSpeed * Time.deltaTime);

But as you can probably tell I get an error, can you please tell me what I'm doing wrong and if you could explain it in more detail for my sake and for everyone else following this question!

$$anonymous$$uch appreciated!

ShadyProductions Saif_youssef89 · Apr 25, 2019 at 07:56 PM 0

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@Saif_youssef89 You can use slerp to spherically interpolate, this treats the vectors as directions rather than points in space like lerp does. This should work:

 var direction = (Target.transform.position - transform.position).normalized;
 transform.right = Vector3.Slerp(transform.right, direction, Time.deltaTime);

Sorry for the late reply.

Make a side of an object LookAT another object

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