as you can see there is an odd shadow, or reflections on white surfaces, near the ground. at first, I thought it’s reflection, and I had bad specular/roughness adjustment. but then I turnd all specular and roughness to 0 and it didn’t change.
I also tried changing colors, but it doesn’t matter.
then I started to change everything, trying to find what’s wrong and here is the issue.
as you see in the ceiling there are small line lights. there are emissive materials casting no shadows. but under them there are rectangle lights. roughly the size of the line lights but slightly wider.
when I turn them off, naturally the scene becomes very dark, but when I turn on auto exposure, and scene becomes bright again, the shadow is gone. so, I can assume there are the problem. but as you can see the settings in right panel, it’s perfectly normal. I have even tried to increase Attenuation radius, maybe it would fix it, but it didn’t. changing size, intensity, barn door, they didn’t work as well.
if you can see, apparently this scene is using Path Tracing, as you can see there is PT on top left corner of first render. well, it once showed a message explaining what it was, and how I can turn it off in Render Settings, but I didn’t totally understand, and I closed the message and went to rendering setting to see what it is, but there is no setting for path tracing there. this only happened once before, so I’m not even sure if Path Tracing is the problem, and how or if I can turn it off.
Sometimes I get those white reflections if my rectangle lights are touching my ceiling surface . Usually if you lower them down a little , that will fix those weird white line reflections . Also , D5 doesn’t have pathtracing yet , it’s just raytracing right now . D5 staff said they will be adding the Pathtracing feature in a feature version so I am not sure what the PT means that you saw in the program one time .
OH MY GOD, sir you are a genius. I would never have guessed that would be my problem! thank you so much for your input.
and about Path-tracing, I know I don’t remember what the exact message was, but I’m pretty sure it said the scene is using path-tracing. I was surprised too. it doesn’t happen every time, as I said only two times. but I’m very satisfied with the two project that it’s active.
You’re welcome ! Haha I ran into that issue one day and it was driving me crazy . Then after accidentally moving the light down it fixed it . Now I just make sure to lower them all down just a tiny bit . And that’s wild ! Maybe they are testing the path tracing feature and yours may have accidentally shown it . Was there a noticeable difference in the GI when the PT showed up? Or did it look the same as the regular raytracing ?
honestly I really think this project looks amazing compared to my other projects, but it’s not like others look bad. like this is a project without it:
and I know materials and lightning are different in these two projects, and maybe that’s just it, but I really do feel the one with PT is better. maybe I’m just imagining
Haha I know materials make a huge difference . They both look great. I feel like path tracing would be a huge difference if it was actually turned on . Those are the renders that you can’t even tell between real life and render. I feel like it may be more noticeable on exteriors since D5 is already pretty good with interiors
Hello! We had added Path tracing to the 2.5 beta, but it didn’t go live because it wasn’t stable yet. We haven’t added this feature in D52.6 for the time being.
