Iray Scene Only render versus No Dome/Ground/Sun/Map

3dOutlaw

If I render a Scene Only render, versus a Dome and Scene (where the dome, ground, sun are turned off, no Env map) should it be the same?  I assumed it would, but it does not seem to be? (attached, top is scene only)

3dOutlaw

OK, I think I figured it out...no env map turn on the sun, whether I want it or not.  To get a transparent background render without the white outlines...render WITH dome and scene, turn off dome and ground and apply a simple black env map.  Looks like I need to re-render my scene...