Raycastの発行（NavMeshQueryで）

RaycastCheck.cs

using UnityEngine;
using UnityEngine.AI;
using UnityEngine.Experimental.AI;

public class RaycastCheck : MonoBehaviour
{
    [SerializeField] Transform start, target;

    private void OnEnable()
    {
        // 事前準備
        NavMeshWorld world = NavMeshWorld.GetDefaultWorld();
        NavMeshQuery query = new NavMeshQuery(world, Unity.Collections.Allocator.Persistent);

        // Raycast発行
        NavMeshLocation location = query.MapLocation(start.position, Vector3.up * 10, 0);
        PathQueryStatus status = query.Raycast(out NavMeshHit hitCheck, location, target.position);

        Debug.LogFormat("IsHit:{0}, status:{1}", hitCheck.hit, status);
        
        // 後片付け
        query.Dispose();
    }
}