Wont allow me to set transfrom.TransformPoint for raycast

I always get range of errors if i try to put
var PointA = transform.TransformPoint(Vector3(0.5, -0.5, 0.5));
and set PointA insted transform.position
i even tryed to whitout defining var and isted just puting transform.TransformPoint(Vector3(0.5,-0.5,0.5)) isted transform.position
Hope anybody gets my point i want to shoot ray from specific position
would like some input

using UnityEngine;
using System.Collections;

public class ReycastingSuspension : MonoBehaviour {
	public float RaycastDistance;


	// Use this for initialization
	void Start () {
	}
	
	// Update is called once per frame
	void Update () 
	{


		//defines HitColector and executes ray
		RaycastHit hitColector;
		if (Physics.Raycast (transform.position, -transform.up, out hitColector,RaycastDistance))
							

		// to see ray in editor and ray distance in console			
		Debug.DrawRay (transform.position,-transform.up,Color.green);
		Debug.Log (hitColector.distance);
	}
}

The above is C#. While the ‘var’ keyword is available, most people explicitly declare the variable. In addition, you need a ‘new’ keyword in front of the Vector3() construction, and you need to explicitly cast your numbers to floats. So it will look something like:

 Vector3 pointA = transform.TransformPoint(new Vector3(0.5f, -0.5f, 0.5f));

and in context:

using UnityEngine;
using System.Collections;

public class ReycastingSuspension : MonoBehaviour {
public float RaycastDistance;

// Update is called once per frame
void Update () 
{
	//defines HitColector and executes ray
	Vector3 pointA = transform.TransformPoint(new Vector3(0.5f, -0.5f, 0.5f));
	RaycastHit hitColector;
	if (Physics.Raycast (pointA, -transform.up, out hitColector,RaycastDistance))
		
		
		// to see ray in editor and ray distance in console            
		Debug.DrawRay (transform.position,-transform.up,Color.green);
	Debug.Log (hitColector.distance);
   }
}

i kinda solved but think this isent right wey to do bu i expanded colider box of object on y axis whit to 1.2