Visualizes vector axes in Unity

DrawSampleVecs.cs

using UnityEngine;
using System.Collections;

public class DrawSampleVecs : MonoBehaviour
{
    void OnDrawGizmos()
    {
       Color color;
       color = Color.green;
       // local up
       DrawHelperAtCenter(this.transform.up, color, 2f);

       color.g -= 0.5f;
       // global up
       DrawHelperAtCenter(Vector3.up, color, 1f);

       color = Color.blue;
       // local forward
       DrawHelperAtCenter(this.transform.forward, color, 2f);

       color.b -= 0.5f;
       // global forward
       DrawHelperAtCenter(Vector3.forward, color, 1f);

       color = Color.red;
       // local right
       DrawHelperAtCenter(this.transform.right, color, 2f);

       color.r -= 0.5f;
       // global right
       DrawHelperAtCenter(Vector3.right, color, 1f);
    }

    private void DrawHelperAtCenter(Vector3 direction, Color color, float scale)
    {
       Gizmos.color = color;
       Vector3 destination = transform.position + direction * scale;
       Gizmos.DrawLine(transform.position, destination);
    }
}