public static void DrawRay (Vector3 start, Vector3 dir, Color color= Color.white, float duration= 0.0f, bool depthTest= true);

파라미터

startPoint in world space where the ray should start.
dirDirection and length of the ray.
colorColor of the drawn line.
durationHow long the line will be visible for (in seconds).
depthTestShould the line be obscured by other objects closer to the camera?

설명

Draws a line from start to start + dir in world coordinates.

The duration parameter determines how long the line will be visible after the frame it is drawn. If duration is 0 (the default) then the line is rendered 1 frame.

If depthTest is set to true then the line will be obscured by other objects in the scene that are nearer to the camera.

The line will be drawn in the scene view of the editor. If gizmo drawing is enabled in the game view, the line will also be drawn there.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void Update() { Vector3 forward = transform.TransformDirection(Vector3.forward) * 10; Debug.DrawRay(transform.position, forward, Color.green); } }
using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { void OnCollisionEnter(Collision collision) { foreach (ContactPoint contact in collision.contacts) { Debug.DrawRay(contact.point, contact.normal, Color.green, 2, false); } } }