Not sure if this has been covered before, but I found a problem with the way Luxus maps HDR images to the Luxrender infinite light.
The HDR maps are rendering in reverse (I only noticed this recently when rendering over a background with writing in it !).
I have mentioned it on Luxrender.net and they have given me a local fix (by editing the generated.lxs file), see this thread for details -
I don’t know how to contact the Luxus writer, is it through the general Daz help system ?
In any case if Luxus reads this, you need to do this apparently to scale the map in the other direction -
# correct worldmap orientation
lux_context.scale(-1, 1, 1)
I also noticed (although nothing to do with Luxus but related), that if you map the LDR image from the HDR set onto a sphere to help with aligning the scene (see this thread -http://www.daz3d.com/forums/viewthread/23209/) , then the sphere is also reversed.
It can be fixed by doing the following=
Helper Ball, Z scale = -100%
Environment map, Y Rotation = -90
Start rendering that and stop as soon as its loaded, then edit the .lxs file with the fix and open it directly in Luxrender. Now Luxrender will render exactly what you see in the Daz window, with all the shadows, sun and IBL in the right place.
<edit> you don’t have to edit the .lxs file, just reverse the HDR Environment in Daz, doh !
Helper Ball, X scale = -100%
Environment map, Y Rotation = -90, X scale = -100%