GL tool for showing grids

Grid.cs

using UnityEngine;
using System.Collections;

public class Grid : MonoBehaviour
{
	public static float gridSize = 0.5f;

	public static Vector2 ToGrid( Vector2 point )
	{
		float xStep = Mathf.Floor((point.x / gridSize) + 0.5f);
		float yStep = Mathf.Floor((point.y / gridSize) + 0.5f);
		return new Vector2 (xStep * gridSize, yStep * gridSize);
	}
	
	public static Vector3 ToGrid3( Vector2 point )
	{
		float xStep = Mathf.Floor((point.x / gridSize) + 0.5f);
		float yStep = Mathf.Floor((point.y / gridSize) + 0.5f);
		return new Vector3 (xStep * gridSize, yStep * gridSize, 0);
	}
}

GridGUI.cs

using UnityEngine;
using System.Collections;
using System;

public class GridGUI : MonoBehaviour
{
	public float pass { get { return Grid.gridSize; } set { pass = value; } }
	public bool grid;
	public Color gridColor, secondaryColor;
	public int strongLineSpace = 5;

	private Material lineMaterial;
	private Camera cam;

	private Vector2 origin;
	private Vector2 gridSize;

	void Start() {
		cam = GetComponent<Camera>();
		origin = Vector2.one*Grid.gridSize;
		gridSize = new Vector2(4.0f,2.0f) * cam.orthographicSize;
	}

	void OnPostRender() {
		GLFunctionality.CreateDefaultLineMaterial(ref lineMaterial);
		GL.PushMatrix();
		lineMaterial.SetPass(0);
		GL.LoadOrtho();
		GL.LoadProjectionMatrix(cam.projectionMatrix);
		GL.modelview = cam.worldToCameraMatrix;
		GL.Begin(GL.LINES);

		// begin grid
		if (grid)
		{
			// X axis lines
			int lineCountX = 0;
			for (float i = origin.x - (gridSize.x / 2 + pass); i <= origin.x + (gridSize.x / 2 - pass); i += pass)
			{
				GL.Color( ((lineCountX % strongLineSpace == 0) ? secondaryColor : gridColor) );
				GL.Vertex(new Vector3(i, cam.transform.position.y - gridSize.y / 2, 0));
				GL.Vertex(new Vector3(i, cam.transform.position.y + gridSize.y / 2, 0));
				lineCountX++;
			}

			// Y axis lines
			int lineCountY = 0;
			for (float i = origin.y - (gridSize.y / 2 + pass); i <= origin.y + (gridSize.y / 2 - pass); i += pass)
			{
				GL.Color( ((lineCountY % strongLineSpace == 0) ? secondaryColor : gridColor) );
				GL.Vertex(new Vector3(cam.transform.position.x - gridSize.x / 2, i, 0));
				GL.Vertex(new Vector3(cam.transform.position.x + gridSize.x / 2, i, 0));
				lineCountY++;
			}
			
		}
		// end grid

		// begin border - i wish there was a better way to do this.
//		Rect bounds = GameController.control.level.levelBounds;
//		GL.Color(Color.red);
//		
//		// they have to be done like this because they need to be above the grid.
//		GL.Vertex(new Vector3(bounds.position.x, bounds.position.y, -1));
//		GL.Vertex(new Vector3(bounds.position.x, bounds.position.y + bounds.size.y, -1));
//
//		GL.Vertex(new Vector3(bounds.position.x, bounds.position.y + bounds.size.y, -1));
//		GL.Vertex(new Vector3(bounds.position.x + bounds.size.x, bounds.position.y + bounds.size.y, -1));
//
//		GL.Vertex(new Vector3(bounds.position.x + bounds.size.x, bounds.position.y + bounds.size.y, -1));
//		GL.Vertex(new Vector3(bounds.position.x + bounds.size.x, bounds.position.y, -1));
//
//		GL.Vertex(new Vector3(bounds.position.x + bounds.size.x, bounds.position.y, -1));
//		GL.Vertex(new Vector3(bounds.position.x, bounds.position.y, -1));
		// end border

		GL.End();
		GL.PopMatrix();
	}
}

neato