Octane does not render correctly

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Octane does not render correctly

Postby JoshNorman » Sat Dec 14, 2019 8:35 pm

JoshNorman Sat Dec 14, 2019 8:35 pm
Is there some sort of work around to get an object to receive bounce lights and correct shadows? I have 2 separate scenes with 2 separate rendering issues. Why is info on how to fix this, not anywhere? I have been looking for days, posted to Polycount, even directly emails Otoy! No responses. Can anyone answer why these issues are happening?Image Image
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Re: Octane does not render correctly

Postby bepeg4d » Tue Dec 17, 2019 7:07 am

bepeg4d Tue Dec 17, 2019 7:07 am
Hi,
unfortunately the links/images you have shared are not available, so it is difficult to say:
A6929B69-AD5A-4F1B-B6E8-984992F85F8A.jpeg

Please, use the Upload attachment button in your replay, to load the images, thanks:
BAD0FD53-724F-4414-8A4D-88C335F38F01.jpeg

ciao Beppe
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Re: Octane does not render correctly

Postby JoshNorman » Sat Dec 21, 2019 7:32 pm

JoshNorman Sat Dec 21, 2019 7:32 pm
I missed the button, the button should be located with the rest of the ui at the top of the reply with all of the other interface, not at the bottom in its own section.

Anyway I have uploaded the image with the issue I need solved.

regards,
Attachments
Octane issue.jpg
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Re: Octane does not render correctly

Postby bepeg4d » Mon Dec 23, 2019 7:04 am

bepeg4d Mon Dec 23, 2019 7:04 am
Hi,
this is a common issue with HDRI lighting, please, have a look at this video:
https://youtu.be/_olHJZ3BV_A
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Re: Octane does not render correctly

Postby JoshNorman » Fri Dec 27, 2019 9:44 pm

JoshNorman Fri Dec 27, 2019 9:44 pm
This is not an HDRI problem because the exact same HDRI map is being used for both images.

I have already checked map settings, I've included the scene below
Attachments
In Progress.ocs
scene
(97.42 KiB) Downloaded 24 times
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Re: Octane does not render correctly

Postby bepeg4d » Mon Dec 30, 2019 8:07 am

bepeg4d Mon Dec 30, 2019 8:07 am
Please, save the scene as package, to create an .orbx file with all the scene’s assets.
The .ocs file is only an xml of the scene, without assets, so it is not useful to be shared.
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Re: Octane does not render correctly

Postby JoshNorman » Mon Dec 30, 2019 7:48 pm

JoshNorman Mon Dec 30, 2019 7:48 pm
attached is the orbx regards
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file.orbx
(15.48 MiB) Downloaded 22 times
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Re: Octane does not render correctly

Postby bepeg4d » Tue Dec 31, 2019 2:54 pm

bepeg4d Tue Dec 31, 2019 2:54 pm
Hi,
thanks for sharing the scene.
As suspected, the chosen HDRI does not have enough f-stops to be able to have nice shadows.
You can check this by increasing the Gamma at 2.2. the shadows are visible, but the colors are off:
5CFDA1FF-49AF-4FC9-AAA2-AE5118D7277A.jpeg

Here is what happen if you change the sun like in the video linked above, with +15 correction for the sun:
4151DEBF-B55B-4C4C-AD04-A160D2A45137.jpeg

Here is the modified HDRI, saved in exr:
Barce_Rooftop_C_3k_b.exr.zip
(10.6 MiB) Downloaded 28 times


If you use yit to our original HDRI in the Visible pin only, you are not lighting the scene with the HDRI, but it is only displayed in background, or considered in reflections/refractions.

Happy GPU Rendering,
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Re: Octane does not render correctly

Postby JoshNorman » Tue Dec 31, 2019 5:51 pm

JoshNorman Tue Dec 31, 2019 5:51 pm
That isn't the issue I posted to get fixed here,

again I'll point out below *"circled in red this time for additional clarity"* the issue I am here to solve.

The dark shadows laying on the object are missing in the render
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Octane issue.jpg
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Re: Octane does not render correctly

Postby funk » Wed Jan 01, 2020 5:20 am

funk Wed Jan 01, 2020 5:20 am
Hi JoshNorman,

I'm not quite sure how you got the 2 screenshots you posted. You state both are Path Tracing renders, and mention the visible environment being used in the second image (although its not plugged in), but I can't figure out how you've set it up.

I tried a few tests, and as far as I can tell, your second image just seems to be using "direct lighting", not path tracing.

First off, the 2 screenshots have completely different environment image rotations, which will lead to different shadows, so I rotated the environment image to match your second screenshot (with darker shadows)

Here are my results.

With your Path tracing settings, I obviously couldn't match the look of your second image:

josh_test_001.jpg


I can get a closer match to your second image by setting the kernel to direct lighting:

josh_test_002.jpg


I can also get something similar with path tracing if I set diffuse depth to 2, although the shadows aren't as dark. There isn't much point using path tracing this way though:

josh_test_003.jpg
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