Adding Camera & Entities
You may have noticed your floor dosn't show up in the 3D Window
You need to add a camera
Click on the tool on the left that looks like a little red camera
Now left-click drag the mouse downwards in either of the bottom 2 quarters of the editor over the floor
This will create a camera and enable you to see the floor in the top-left quarter (camera view)
Now we need to add the place the player starts from to help judge how high the walls need to be
Select the tool that looks something like a light bulb just below the little red camera tool
This is the Entity Tool
Left-click just above the floor brush in either of the 2 side view windows and hit Enter
Right-click the entity you just made and select "properties" and change the entity type to "info_player_start"
Move the entity so it's as close the floor as possible (a unit above it is ok)
Now we can make the walls of the room with something to scale with
A usefull tip here is once you've made and placed one wall hit Ctrl+C followed by Ctrl+V to copy/paste then
move the copy into place...same for the other two walls
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