Recent posts

#1
Terragen Discussion / Re: Pixel gaps in rendering
Last post by sboerner - Today at 11:42:54 AM
For some reason one of the attachments didn't make it. Here it is.
#2
Terragen Discussion / Re: Pixel gaps in rendering
Last post by sboerner - Today at 11:41:11 AM

QuoteI have access to most of the Mega Scan Library, if you post  (or private pm) the file I can almost certainly re-create it without you having to share the commercial file.

Alternatively, try to convert the exr to a 16bit tiff and see if the issue remains. I doubt the image would look any different after the conversion.

The material causing the error is "pine_2x2m_Bark_Pine_vmbibe2g." The displacement file is "vmbibe2g_4K_Displacement.exr."

I checked other Megascans surface materials, though, and found that many of them use "[R]" single-channel EXR files for displacement. They are easy to spot in Adobe Bridge -- the thumbnail previews show up bright red.

Opening and simply resaving the files (as OpenEXR) in Photoshop converts them to RGB files and fixes the problem.

The attached tgd will show the error. I've removed the displacement file from the Project_Assets folder -- you'll need to drop it in there. Here's what I see when I open the tgd:

trImage attempting to read file Project_Assets/vmbibe2g_4K_Displacement.exr
FreeImage error: Warning: loading color model R as Y color model


The error appears benign in that it doesn't cause any rendering problems . . . but as I suspected no displacement or bump is produced. The attached renderings show the results of using the original EXR file vs. one fixed by a round trip through Photoshop.

Interesting.

#3
Image Sharing / Re: Canyon series 1
Last post by Dune - March 27, 2024, 11:37:23 AM
Didn't read it well. I see now.
#4
Image Sharing / Re: Canyon series 1
Last post by Tangled-Universe - March 27, 2024, 11:20:09 AM
No as I said I deleted all the nodes except the 2 simple shapes which create the walls +1 compute and lambert and only those 4 nodes take 45 minutes to render vs 37 sec non-PT.
#5
Terragen Discussion / Re: Pixel gaps in rendering
Last post by cyphyr - March 27, 2024, 10:12:28 AM
I have access to most of the Mega Scan Library, if you post  (or private pm) the file I can almost certainly re-create it without you having to share the commercial file.

Alternatively, try to convert the exr to a 16bit tiff and see if the issue remains. I doubt the image would look any different after the conversion.
#6
Image Sharing / Re: Canyon series 1
Last post by Dune - March 27, 2024, 02:16:51 AM
I can imagine :(  Strange that it takes so long, it doesn't look overly complicated, and displaced. Too many shaders before a compute perhaps? Perhaps it would be possible to make the scene with 2 cubes as walls. You'd only miss the subtle transition with the floor then, but it might be faster (no compute needed, I'd say).
#7
Image Sharing / Re: Canyon series 1
Last post by Tangled-Universe - March 26, 2024, 08:01:26 PM
I agree with you about the vertical one being the most interesting, for the same reasons.
The scene does not contain any kind of reflective shader. It's really only one single lambert shader with bright orange colour which does all the work in conjunction with GI.

I'm afraid I have to postpone my plan to do a PT render of it.
I just trimmed down the entire setup to basically only 2 simple shape shaders which create the canyon and somehow that takes 45 minutes vs 37 seconds for non-PT.
This means that my 5'ish hour render for that vertical one will take 20 days. No thanks haha...
There must be a reason for why TG doesn't like this particular and I guess rare situations, since normally it's only a couple of times slower, not 2 orders of magnitude.
#8
Image Sharing / Re: Canyon series 1
Last post by Dune - March 26, 2024, 12:24:45 PM
If you ask; the latter, vertical one appeals most to me, because of the contrasts. PT has 'trouble' with tiny displacements+reflection, that may be the 'problem'. But even a very small PT render will show the differences, I'd say.
#9
Image Sharing / Re: Canyon series 1
Last post by Tangled-Universe - March 26, 2024, 11:54:16 AM
Quote from: Dune on March 26, 2024, 02:34:21 AMThanks Martin. Interesting fact about the cache detail. I wonder how it would look in PT.
Welcome!
Yeah me too, but somehow it's crazy slow with PT. I might try Thursday overnight since I won't need my PC until Friday noon.
Which one should I choose you think? I probably can't render it bigger than 1280 wide/tall.
#10
Image Sharing / Re: Canyon series 1
Last post by Dune - March 26, 2024, 02:34:21 AM
Thanks Martin. Interesting fact about the cache detail. I wonder how it would look in PT.