radar orthogonal line to plane

Question

hi guys I've created a radar my self, for a spaceship simulator that I have created

the Radar was created from 4 gameobjects: 1. radar - sphere (parent) 2. center - plane 4. centerPoint - small sphere that indicates point 0,0,0 in the radar (sphaceship location in the radar) 5. enemies points - list of small spheres that represents the enemies

Im trying to streach a line from the enemies points to the center plane that indicates the object relative height (relative to the spaceship because its space) but so far without success

any help will be appreciated

thanks in advance

Gal

Answer 1

Best Answer

Answer by HarshadK · Jun 09, 2015 at 09:48 AM

If your plane is always going to be perpendicular to the world Y axis then you can just perform a Raycast from the position of enemy ship sphere in world y axis direction. Now where this raycast intersets your plane will be the point on the plane is your second point. Now you can draw a line using Line Renderer with first point being the position of enemy ship sphere and second point we calculated above.

If your plane is not always perpendicular to the world Y axis then you would need to use Vector Projection to calculate this second point on the plane to draw the line.

Add comment · Show 4 · Share

galshal · Jun 09, 2015 at 10:06 AM 0

Share

is there a tool in unity that helps me calculate the vector projection?

HarshadK · Jun 09, 2015 at 12:14 PM 0

Share

No there is no direct method that will provide you with vector project. But there is just another way you can do it. Just find out the normal of the plane (up direction of transform in this case will do the trick). Now perform a raycast towards the plane and where this raycast hits the plane is your second point. Below is the test code for the same. You just have to make necessary changes to as per your structure and replace the Debug.DrawLine method with drawing the line with a Line Renderer. For this current code to work it has to be attached to the plane since it takes the transform of plane directly to work things out.

 // The transform of your enemy spaceship
 public Transform enemy;
 
 void Update () {
     
     // Get the up direction of transform and decide the direction based off the position of plane with respect to the enemy ship
     Vector3 dir = (transform.position.y < enemy.position.y) ? (-transform.up) : transform.up;
     
     RaycastHit hit;
     if(Physics.Raycast(enemy.position, dir, out hit))
     {
         // Draw the line between enemy ship position and hit point.
         Debug.DrawLine(enemy.position, hit.point, Color.green, 0.1f);
     }
 }

galshal · Jun 09, 2015 at 01:16 PM 1

Share

thanks alot man

lots of respect

HarshadK · Jun 09, 2015 at 01:37 PM 0

Share

Happy to help. :-)

radar orthogonal line to plane

1 Reply

Your answer

Follow this Question

Related Questions