[Tutorial] Use crowbar to open a door

[pontusry]

You should probably mention that this:

AddPropImpulse("NAMEOFYOURDOOR", -1, 2, -4, "world");


Should be this:

AddPropImpulse("NAMEOFYOURDOOR", afX, afY, afZ, "world");


afX: Direction along the X-axis
afY: Direction along the Y-axis
afZ: Direction along the Z-axis

Since it's true on "world", then it won't be correct for everybody if they use the same amounts.