Custom Textures

Cover your new brush with the same texture as
your floor.  Now select the surface of your new
brush  and  apply  the  new  texture.  Line  it up to 
your  liking  and now  hit  the space  bar to clone 
the brush.  Lower  the  new  brush  into  the  floor
making sure that it's level with the floor surface
and  hit  the CSG Subtract button on  the tool  bar.
Hit back space to delete the area.

   

You should  see  a  hole  in  the  floor  surface that
matches the texture brush perfectly.  Now simply
lower  the  texture  brush  into the hole you've just
cut out.   That's it!   Save,  compile,  and  launch Q3.

   

You can see the final results in the image below.
By  making  your  own  textures  your  creative
options  are  wide  open.  If  you'd  like to make a
total  conversion  using  the  Q3 engine  custom
textures are a must and will really set your work
apart from others just using the defaults from id.