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Question by Michael4CG · Mar 28, 2020 at 11:36 PM · project

how to project point on plane in space

Hi, I am trying to project a point on a plane in space but I am getting a projected point on world space planes why ?? how do I get the coordinates of the point projected on the plane , or what is called the closest point from the plane to the target point?

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Answer by Adamcbrz · Mar 29, 2020 at 12:11 AM

Ok here is the code that should explain what needs to be done.

 using UnityEngine;
 
 public class PositionOnPlane : MonoBehaviour
 {
 
     [SerializeField] Transform cube;
     [SerializeField] Transform sphere;
 
     [ContextMenu("Place")]
     void PositionObject()
     {
         Vector3 a = transform.position - cube.position; // distance and direction from cube to this transform
         Vector3 n = transform.up * -1; // Get inverse of normal
 
         float angle = Vector3.Angle(a.normalized, n); // get the angle between the two vectors
 
         // since that gives us a Hypotenuse and an angle we can solve for the adjacent
         // cos(θ) = adjacent / hypotenuse
         // cos(θ) * hypotenuse = adjacent
 
         float length2Plane = Mathf.Cos(angle * Mathf.Deg2Rad) * a.magnitude;
 
         sphere.position = cube.position + n * length2Plane;
     }
 }
 

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avatar image Michael4CG · Mar 29, 2020 at 12:38 AM 0
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Thank you very much !

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