Drawing a tile grid

- Now we're ready to draw the grid inside of our tile map.…Let's go back into our TileMap class.…Above where we start drawing out the border,…we're going to want to put the rendering logic…for each of the cells of the grid.…The reason we do this is that we want the grid to draw first…and then the border around it.…When you draw a Gizmos, it's very important…to make sure that the order goes from lowest to highest…as you lay it out inside of the OnDrawGizmosSelected method.…In order to help see the cells of the grid a little easier,…we're going to make them gray.…

Then we're going to need to create a few variables…to help us as we iterate through all the grid cells,…in order to render them out correctly.…We'll start by creating a row variable…and we'll set that to zero.…Now, we need to create a maxColumns variable,…and we'll set that to the mapSize.x.…Next, we'll calculate the total number of cells in the grid,…by multiplying the mapSize.x, by the mapSize.y.…Now, we'll need to get the size…of the tile and the World Space.…