The file is in a PK3 because you need to do that to have models in your mod. If you want to open the map to see how the table was made, you may have to extract the WAD file from the pk3.
pk3s are just zip files so open it using whatever method you use to open zips (you may have to rename the file from table.pk3 to table.zip) and extract the map (map01.wad) from the maps sub folder.
There's nothing special about the map. It's in ZdoomHexen format so it should be easy to read.
Anyway, step by step.
Make a sector in your play area that you want to be the table and make it the right shape.
Give the sector a tag.
Make a control sector. This can be any shape (unless you want sloped 3D floors, but we'll keep it simple for the moment eh
).
There are a few options but, in its basic form, a GZdoom format 3D floor control sector is like this:
The top of the control sector should be the height that you want the top of the table/3D floor to be.
The bottom of the control sector should be the height that you want the bottom of the table/3D floor to be.
The flat on the ceiling of the control sector will be applied to the top of the table.
The flat on the floor of the control sector will be applied to the bottom of the 3D floor.
The light level in the control sector will be applied under the 3D floor.
Set one side of your control sector to be line type 160. This is the special that sets a 3D floor.
Set its first argument to the same number as the tag you gave your sector.
Set the second argument to 1. This specifies a solid GZdoom format 3D floor (GZdoom also supports Vavoom type floors but GZdoom ones are better).
Leave the third argument at 0 (this can be used for some fancier options, but we're keeping it simple ATM).
Set the fourth argument to a value from 0 to 255. This sets how transparent the floor is 0 is invisible, 255 is fully opaque.
The fifth argument is only needed if you have lots of tags in use or want to set a line id.
Finally, unless you have set the third argument to 16 or 32 (which we haven't) which ever texture is used on the line 160 will be applied to the sides of the 3D floor.
[wiki]Sector_Set3dFloor[/wiki]
