Vray 3 - Frosted Glass?
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Hi,
Any idea how can I increase subdivs on Frosted Glass effect with backlight, it looks too noisy. Or if this effect can be tweaked directly from render settings? Thanks.
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What is your noise & min shading rate set to?
Yeah, no more material subdivs...its all render settings now.
If you dont want to mess with the settings too much and you're happy with the rest of the render, you could make sure you're switched to progressive rendering and just do a 'region render' and render only the glass areas. That way all of your subdivs will focus on the small regions and clean it up faster/better. Sometimes you cant see the seams from the consecutive renders, but sometimes you may need to composite in post and clean up the seams.
But, to fix your problem without doing a 'work-around' while just doing a normal render, I think you'll have to take a look at your min shading rate.
Chaos Group definition: "Shading Rate – Controls how many rays will be used for calculating shading effects (e.g. glossy reflections, GI, area shadows, etc) instead of anti-aliasing, and more effort will be put in the sampling of shading effects."With the new system in Vray 3.4, if you're using progressive with brute force, the only things you should have to mess with for quality is noise level and shading rate...aside from image size, of course.
Bump your min shading rate up and noise level down until things clean up to your liking. You can add sample rate pass to your render elements to see where your noise is compared to your anti-aliasing to help you figure out your next move.
While you're at it, you could also add a denoiser pass, it will add another render element with way less noise that you can use as your beauty pass or just composite parts you want in post. With 'way less noise' comes way less detail...thats why you may want to just use certain parts of denoiser pass.
If you share your render settings, may be able to give some more customized help.
cheers
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@burlynomad said:
What is your noise & min shading rate set to?
Yeah, no more material subdivs...its all render settings now.
If you dont want to mess with the settings too much and you're happy with the rest of the render, you could make sure you're switched to progressive rendering and just do a 'region render' and render only the glass areas. That way all of your subdivs will focus on the small regions and clean it up faster/better. Sometimes you cant see the seams from the consecutive renders, but sometimes you may need to composite in post and clean up the seams.
But, to fix your problem without doing a 'work-around' while just doing a normal render, I think you'll have to take a look at your min shading rate.
Chaos Group definition: "Shading Rate – Controls how many rays will be used for calculating shading effects (e.g. glossy reflections, GI, area shadows, etc) instead of anti-aliasing, and more effort will be put in the sampling of shading effects."With the new system in Vray 3.4, if you're using progressive with brute force, the only things you should have to mess with for quality is noise level and shading rate...aside from image size, of course.
Bump your min shading rate up and noise level down until things clean up to your liking. You can add sample rate pass to your render elements to see where your noise is compared to your anti-aliasing to help you figure out your next move.
While you're at it, you could also add a denoiser pass, it will add another render element with way less noise that you can use as your beauty pass or just composite parts you want in post. With 'way less noise' comes way less detail...thats why you may want to just use certain parts of denoiser pass.
If you share your render settings, may be able to give some more customized help.
cheers
Thanks for your answer!
I cannot attach vropt file, unfortunately. I've seen that from noise setting 0.005 noise starts to disappear along with Denoiser pass. I'll try with your recommendation and see the result, I will attach it here when ready.
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Sorry for the late reply..twas a busy day.. No problem..the screenshot is all we need to see what is going on. Your settings are definitely a mess.
Quick rundown:
Raytrace Quality - need higher Max Subdivs. Optimization - you can lower the shading rate(much lower..I generally use from 2 to 6 and only raise higher if glossy reflections need more help) and turn off probabilistic Lights.
Global Illumination - need higher Irradiance map settings across the board...those are test render/draft settings at best - min rate, max rate, subdivs, and possibly interpolation...and with a dark scene you generally want higher subdivs & IM rates. You'll also want much higher Light Cache...for any scene, but specially for a dark scene, 1800-2000+. And finally, turn off ambient occlusion...if you really want it, you can turn it back on once you're satisfied with quality. But you should look into adding AO through ExtraTex render element...its done in post and gives you much more control without affecting quality....rendering AO often adds noise(which you're spending all this time trying to eliminate.) More on ExtraTex AO here--> https://docs.chaosgroup.com/display/VRAYSKETCHUP/ExtraTexAnyway, your best bet to remedy all this and any other settings you messed with is to just reset to default settings (take note of your exposure/resolution/environment settings first), then just use the 'slider' next to Render>Quality. Simply pick draft,low,medium, or high and Vray will adjust everything for you. They rewrote the renderer so settings from 2.0 don't necessarily apply anymore. Remember after restoring defaults to re-enter your values for exposure,etc.
After you reset to default setting and try rendering with the builtin quality presets, re-post with any problems still present along with another screen shot of the settings and I can help you dial it in a little more. Your current settings are way too out of wack to even try to mess with. I would recommend until you get the hang of the new parameters in Vray 3.4, that you always start with default settings and just use the quality slider presets - low,medium, high, etc, then only make small changes to settings to see how they affect the render. And dont be afraid to just reset to default any time things start getting out of hand...it will just give you more practice at tweaking the settings.
Honestly, I used to be Vray setting tweaking addict, but with the new system, you dont' have to mess with it that much once you get the hang of it.
Just thought of something else, Chaos Group recently produced 3 really nice tutorials explaining how to use the new system...exterior, interior, and one on materials. They're on chaos group's youtube account - highly recommenced. They did a great job and were pretty thorough at covering all the bases.
Hope this helps. Let me know how you go.
Cheers! -
That is really useful, thanks a lot. Attached is a rendering with some setting tweaks, which lasted 2h30min to "cook".
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Thats great! Nice looking render. I love this design, btw. Very cool...the car is a perfect fit here, too.
Are you using light dome/HDRI or Vray sun to light the scene? If light dome/hdri, you can up the texture resolution from 512 up to 2048 for some more GI quality. (at the cost of higher render times, of course
With low light renders such as this, you're always going to need higher settings to reduce noise...and longer render times. Although there are tricks to getting around this which happen in post.
From here you can save the render in frame buffer history, then do small render regions on problem areas while tweaking one setting at a time to figure out what works/helps and what doesn't. So, depending on what renderer/GI method your using, you may try upping the min shading rate a bit or lowering the noise threshold if using brute force. Or if using Irradiance Map, try raising Quality subdivs and/or Irradiance map subdivs. If done correctly, your region renders should merge with the whole render, if not, just save them all and smooth out the seams in photoshop. Unfortunately, the denoiser passes when using render region leave the rest of the render outside the 'region' black....so they have to be composited in post...hope they fix that soon. Let me know if you have any more questions about anything. Good luck and have fun!
On a side note - if this were my project, I would like to see how things look with the architecture lit up more. Maybe more exterior lighting to really accentuate the building. I like the mood you have here, but overall its a bit flat. More lighting like you have around the base structure could really make things pop.
cheers!
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