Как триггерно создать блок. пути на тип местности?

function SetPathingRect takes rect re, pathingtype pt, boolean pathable returns nothing
    //probably this trigger won't work if you don't snap the regions to the grid

    //available pathing types
//PATHING_TYPE_ANY                 //if this is false you can't walk/build/fly on it
//PATHING_TYPE_WALKABILITY         //if this is false you can't walk on it
//PATHING_TYPE_FLYABILITY          //if this is false you can't fly on it
//PATHING_TYPE_BUILDABILITY        //if this is false you can't build on it
//PATHING_TYPE_PEONHARVESTPATHING  //don't know
//PATHING_TYPE_BLIGHTPATHING       //if this is false you can't build ziggs on it
//PATHING_TYPE_FLOATABILITY        //don't know
//PATHING_TYPE_AMPHIBIOUSPATHING   //don't know

    local real r = 32  //size of pathing blocks
    local real x = GetRectMinX(re)
    local real y
    local real x2 = GetRectMaxX(re)
    local real y2 = GetRectMaxY(re)

    loop
        exitwhen x == x2
        set y = GetRectMinY(re)
        loop
            exitwhen y == y2
            call SetTerrainPathable(x, y, pt, pathable)
            set y = y + r
        endloop
        set x = x + r
    endloop
    call RemoveRect(re)
    set re = null
    set pt = null
endfunction