You all
know about jump pads right?
Those bouncy things all over the game, well this
tutorial will explain how you create them.
The
first thing you need to do as create a small
level/room with a ledge for you to jump up to like
this.

Next we
need to place our jump pad texture which you can
find in the sfx texture list somewhere on the floor.
ok,
above the jump pad draw out a brush which is the
same size as the texture and about 8-16 units high.
Give this brush a trigger texture which can be found
under common in the texture list.

With
this new brush selected, right click and then scroll
down to trigger and the click trigger_push, what
this does is tell that brush that it will be a
trigger push.
On the
ledge above place a target_position entity by right
clicking and then selecting it.
Now the
fun bit,
First, select the trigger_push brush then select the
target_position entity and once both these are
selected hold down Ctrl and press K.
this
will link your 2 entities together making everything
work :)
You will
probably have to mess around with the position on
the target_position so go enjoy.
Check
out my example here.