Quote - I will do the sun or sun+sky option.

I'm in the middle of calibrating the regular infinite, though and I've run into something really strange.

If I use just one infinite (lux's "distant") light, and calibrate it to match the luminance of the Poser infinite light, it looks just exactly right, but only with certain render settings.

When I use metropolis/bidir, it looks like what I expect. When I use lowdiscrepancy/directlighting, it is 1000 times brighter. Perhaps I don't understand the universe, but changing the sampler and integrator should not alter the luminance, should it?

Also, I have some concern about coordinate transformation (or the current lack thereof). When you use the sun+sky built-in feature, it selects sun and sky colors based on the elevation of the sun, so as to properly represent how the sky looks with the sun very high versus close to the horizon.

But in Lux, "up" is Z, not Y. So I think any testing you're doing with sun+sky is off by 90 degrees.

I will set up the sun+sky export and check it out. If it looks wrong, I'll try adding a world transformation that rotates the whole scene. There should be no need to modify any of the other exporters - just need to rotate globally. While I'm at it, I'll probably add the conversion of Poser Native Units into meters in the world transform.

You know, I've been playing with some of the sliders in Lux. And some of them do things I didn't expect either. When you increase the Fstop distance, the whole image blows out. You have to readjust with exposure and/or light gain. I didn't expect that changing fstop (which is a camera setting, is it not?) would affect light brightness ;o). But then, I'm not the most sophisticated 3D person in the world either, so I really don't know much in the scheme of things.

Laurie