It is used to create the 'hull' of the map. Block Creation Tool- The BC Tool is the most important tool in Hammer, as it is what allows you to create your maps.Most commonly used are info_player_start, light, light_environment, prop_physics, etc. To access the list of entities, when you click on the Entity Tool, a list on the lower right side of your Hammer should say 'Categories: Entities' click on the drop down menu below that and you'll find a list of entities to spawn. Entity Tool- One of the most important tools the Entity Tool allows you to place entities such as info_player_start ~ player spawns.If you look at one of your 3 grids while using the Cam tool, you can left click then drag the mouse to set a perspective point. Camera Tool- This tool is helpful as it allows the mapper to get a 3D perspective of his map (You can change between what the Camera tool renders in the View menu bar.) Left click to alter where the camera is facing, and right click to strafe the camera.
Using the mouse wheel while using the Camera tool zooms in and out just as much as this tool does. Get familiar with the tools you'll be working with.
