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My best solution so far is to set the darkness of both the white sun and concurrent negative blue sun darkness to 100%. Outside I can achieve believable ambient fill with global ambient intensity at 140% from the surrounding sky dome. However inside an enclosure, not enough global ambient rays enter to produce adequate exposures and I have to crank occlusion sampling to 100% to minimize the noise it generates on surfaces. So to get a reasonable exposure inside something like the WIP observation car (shown attached) I put a properly tweaked klieg outside each window pointed inward. The passenger car is made of two models, exterior and interior. These ambient skylight kliegs get put into a light list so only the interior model is lit by them. I'm not sure I've got the right light levels but I'm getting close. passenger_car_pass_thru_00.mp4