Glide Rotor Clearance Fix

--- Check if the rotor blades are hitting things.
function ENT:CheckRotorClearance( dt, parent )
    -- The trace will use a spinning angle separate from the model
    self.traceAngle = ( self.traceAngle + dt * 1600 ) % 360

    local ang = parent:LocalToWorldAngles( self.baseAngles )
    ang:RotateAroundAxis( ang[self.spinAxis]( ang ), self.traceAngle )

    local dir = self.spinAxis == "Forward" and ang:Right() or ang:Forward()
    local data = self.traceData
    local origin = self:GetPos()

    -- Trace towards the angle direction
    data.start = origin
    data.endpos = origin + dir * self.radius

    if IsValid(self:GetParent():GetDriver()) then -- copter & driver
        data.filter = {self:GetParent():GetDriver(),self:GetParent()}
    else
        data.filter = self:GetParent() -- copter
    end

    if self.isDebugging then
        debugoverlay.Line( data.start, data.endpos, 0.05, Color( 255, 0, 0 ), true )
    end

    local tr = TraceHull( data )

    if tr.Hit and not tr.HitSky and not tr.HitNoDraw and tr.HitTexture ~= "**empty**" then
        self:OnRotorHit( tr.Entity, tr.HitPos, origin )
        return
    end

    -- Another trace on the opposite direction
    data.endpos = origin - dir * self.radius

    tr = TraceHull( data )

    if tr.Hit and not tr.HitSky and not tr.HitNoDraw and tr.HitTexture ~= "**empty**" then
        self:OnRotorHit( tr.Entity, tr.HitPos, origin )
        return
    end
end