bulletTrace( fromPoint, toPoint, stopOnEnts, excludedEnt );

fromPoint - the starting ( x, y, z ) point for the trace
toPoint - the ( x, y, z ) position targeted by the trace
stopOnEnts - a boolean value to make the trace to stop on entitys excludedEnt - the trace will continue if it intersects this entity

The function returns an array with the following:
>>>[ "position" ] - the ( x, y, z ) position where the trace ended

>>>[ "fraction" ] - a float value from 0 to 1 that represents the fraction of the distance from fromPoint to toPoint that was traveled to reach [ "position" ]

>>>[ "entity" ] - the entity object that the trace hit at [ "position" ]

>>>["surfacetype" ] - a string that is the type of surface that the trace hit at [ "position" ]

>>>["normal" ] - a vector that is the normal of the surface that the trace hit a[ "position" ]

>>>array["fraction"] is the fraction of the distance the bullettrace travelled. if it didn't hit anything between the two specified vectors then it will return 1.0. if it hit something 75% of the way through its path it will return .75

i also have a question
what a bullettrace do i need when i want to know if nothing is between point A and point B? (not the usual bullettrace()-func)
i tried sighttracepassed, but it seems to be that i missed something.