The grid selector object needs a mesh filter component and a mesh renderer. Both will be added when adding the Grid Selector script to an object. You can find meshes in /Meshes/GridSelectors and the material in /Materials/GridSelector.

This allows you to see a visual representation of moving on the grid. It also allows you if an Object Placer is assigned to place objects on the grid.

The Grid Selector if paired with an Object Placer creates a preview Object to create a ‘where to place’ visual. This Grid Selector needs to be passed an object for this.