line pick

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jfk EO-11110

It's simple. THe entities you may pick must have their pickmode set, see ENtityPickmode.

Everything else is explained in http://www.blitzbasic.com/b3ddocs/command.php?name=LinePick&ref=goto

cube1=createcube()
positionentity cube1,0,0,50
entitypickmode cube1,2

pick=linepick(0,0,0,0,0,100)

if pick=cube1 then print "picked the cube mesh"

see also:
http://www.blitzbasic.com/b3ddocs/command.php?name=pick&ref=goto