Calculate Height of Trajectory : Unity3d

Question

hello everyone ,

I have done trajectory motion and its working perfectly..

For calculating velocity i have written code like this :

 function GetTrajectoryVelocity( startingPosition : Vector3,  targetPosition : Vector3,  lob : float ,  gravity : Vector3) : Vector3
     {
         var physicsTimestep : float = Time.fixedDeltaTime;
         var timestepsPerSecond : float = Mathf.Ceil(1f/physicsTimestep);
         
         var n : float = lob * timestepsPerSecond;
         var a : Vector3 = physicsTimestep * physicsTimestep * Physics.gravity;
         var p : Vector3 = targetPosition;
         var s : Vector3 = startingPosition;
         
         var velocity : Vector3 = (s + (((n * n + n) * a) / 2f) - p) * -1 / n;
         velocity /= physicsTimestep;
         return velocity;
     }

The equation for calculating max height is here : Maximum Height

But i to calculate height using this equation ? I am having velocity , angle .

So my problem is how do i make equation in code?

Thanks for your help till now..

Answer 1

Answer by MrVerdoux · Dec 11, 2013 at 08:12 AM

First of all, I don´t think you should recreate the whole physics system, Unity has an amazing built-in physics system, and it´s much more efficient than anything you can come up to.

But, anyway, your question has an answer. I guess you must have an initial velocity, apart form an initial position. You can calculate the angle from that initial velocity:

 var initialVelocity : Vector3; 
 var angle : float;

 function Start () {
     initialVelocity = new Vector3(1,1,1);
     angle = Vector3.Angle(new Vector3(initialVelocity.x,0,initialVelocity.z), initialVelocity);
 }

edit: and of course, form that point use the equation pointed by robhuhn, I assumed your problem was with finding the angle.

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Calculate Height of Trajectory : Unity3d

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