How to find an intercept on a moving target

Question

So here is my code roughly

 Distance = Vector3.Distance(transform.position,Target.transform.position);
 float timeToTarget; 
 float burnDistance =  Projectile.MetersPerSecond * 2f * 2f * 0.5f;
 
 if (Distance < burnDistance)
 {
     timeToTarget = Mathf.Sqrt(2 * Distance / Projectile.MetersPerSecond);
 }
 else
 {
     float velocity = Projectile.MetersPerSecond * 2;
     TimeToTarget = 2 + (Distance - burnDistance) / velocity;
 }
 AimPoint = Target.transform.position + (Target.transform.rigidbody.velocity * TimeToTarget) + (Random.insideUnitSphere * Accuracy);
 Distance = Vector3.Distance(transform.position,AimPoint);
 TimeToTarget = Mathf.Sqrt(2 * Distance / Projectile.MetersPerSecond);

i'm trying to intercept a target with a projectile.

The issue is finding the proper time to target I think.

Basically when I find the distance to target then use that to find the time to target it changes my aimpoint to where the target will be in time seconds. But now the distance has changed. Now i'm now longer distance to target away i'm distance to aimpoint away from what i want to hit.

Basically as the target moves away from me it takes longer for the projectile to hit the aimpoint than is predicted by distance to target. So I can fix this somewhat by running the algorithm again. Only using the aimpoint as the target and getting a closer approximation. I could keep doing this to get really close but that seems highly ineffiecient. Is there a better way?

Answer 1

Best Answer

Answer by Bunny83 · Jan 12, 2014 at 05:38 PM

This question has been asked around 5 times here on UA:

http://answers.unity3d.com/questions/296949/how-to-calculate-a-position-to-fire-at.html

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Answer 2

Answer by Mutain · Jan 06, 2014 at 10:41 PM

take a look at this post http://stackoverflow.com/questions/2248876/2d-game-fire-at-a-moving-target-by-predicting-intersection-of-projectile-and-u

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How to find an intercept on a moving target

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