Sand-like noise on reflections with V-Ray materials

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1 May, 2011 sonarrr
1 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Good afternoon, Master! When rendering bathrooms faced with the fact that the rash appears, the sand in the ground of the expected highlights on the tile and wood. Calculating done through SolidRocks and interpolation using these phenomena turns "blur." Tell me, are there any other ways ??


1 May, 2011 RenderStuff (Staff Author)
1 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Hello, sonarrr! SolidRocks is a plug-in for 3ds Max, which is the maximum speeds and simplifies configuration V-Ray. However, often such acceleration is quite excessive and leads to loss of control over vizualzatsiey. The slightest deviation from the standard situation - and visualization becomes unacceptable artifacts. To render is a beautiful and exactly as you want, and not "combed one size fits all", you should perform several points:
  1. Do not use in this case SolidRocks continue to try to reduce the utilization of its assistance 👌
  2. Read the series of articles devoted to setting-Ray the V . They describe all the V-Ray settings with detailed recommendations of what and how much and where to incorporate. The articles you will find in the section of the lesson dedicated to computer graphics 3d rendering .
  3. Clearly follow all recommendations given there.
  4. If the specified you the problem persists, do something and put here links to scenes screenshots with light sources, their settings, settings screenshots V-Ray, so we have seen that you have followed all of the recommendations that you have read these articles and, of course, renders that come at you.
Then we will be able to judge your problem and give you specific recommendations for its decisions.


1 May, 2011 sonarrr
1 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Thank you! All of your lessons and so I read not just with them, and started the scene. But the speed! .. Now prefer it. However, I follow your advice, recheck the settings and see what happens!


1 May, 2011 RenderStuff (Staff Author)
2 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Oddly enough, but the artifacts, "unknown" problems and other delights that accompany everything automatically in the background configure anything, guided only by the taste of developers completely negate the very speed settings. After all, time to eliminate problems and their solutions can not be ignored. Once understood and nominally correctly set all the settings, you will no longer dress up encounter strange problems. And if something is there, then you will be sure that the problem is not in the settings, but in something else. This will allow us to identify and eliminate it. Yes, of course, followed by all of the recommendations. Do not forget to show what comes out😉


1 May, 2011 sonarrr
2 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
🙂 Welcome!


1 May, 2011 sonarrr
4 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Dear Master, did everything as for writing. The result was not satisfied. All the same, there is a rash, a little different, but goes. Prompt, where it is better to lay out the screenshots?


1 May, 2011 RenderStuff (Staff Author)
4 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Hello, sonarrr. Do not worry, in all understand, it is quite "home" artifact 🙂 As for the hosting of pictures, read this post . There you will find answer where their best to fill in😉


1 May, 2011 sonarrr
4 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Here's a picture (considered to be one and a half hours) Scene: Sources of light: Settings:


1 May, 2011 RenderStuff (Staff Author)
5 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Do not quite understand why you say the noise is on reflection, it is you all over the stage. In any case, let's see what is. You vain did the emphasis on the main light source in your scene. He can hardly see on your screenshot. You should always make a screenshot from above the entire scene to be seen all lajty. Judging from your screenshots, the main light source in your scene - VrayLight Plane on the balcony. That he is the main generator of the shadows and that their noise and watch you in your scene. The first thing you should do is make it inside your room. Just put it right before the window. Not in front of the window balconies, namely inside the room. The next thing you need to do is to increase the value of this Subdivs Lite. In the worst case, 30 is, at best 60 or even 90 Subdivs. It is this parameter is responsible for the quality of shadows generated by the light source. And the last thing you should do is turn off the Sun% B5 other light sources. Photometric points at the top and on the sides zakarniznuyu backlight. So you can be sure that none of them does not interfere with the correct setting of lighting in the scene. Correct set up the main light source in front of the window. Then you make sure that everything is set up and how you need to include an internal light. Also, we advise you to read the topic about the correct tuning of lighting in the interior with the help of Ray-the V . There a-kit the situation is very similar to yours, a hair's breadth. Read this issue closely and you'll probably find yourself there for a lot of useful. In particular, on how to properly make exceptions for VRayLight objects in windows, how to install them and that gives tick Affect specular. As you look on the topic VRayLight windows with interior lighting modes portal the skylight . In particular, pay attention to check Simple and of course carefully read the Sunth theory. It describes a very useful thing😉


1 May, 2011 sonarrr
5 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Thank you very much, RenderStuff !!! As everything is easy🙂 if znayuchi .. Here's how to become: Thank you for the awesome useful and accessible information, and your responsiveness - THANK YOU 🙂 Oh, and while I was doing this, any more questions - how best to make the background of the window (try the experience of a-kit - outside there was a gray screen, although and excluded, and texture appointed ..) and more. Can I save maksovsky file in an older version of the 2012 and how to do it?


1 May, 2011 RenderStuff (Staff Author)
5 May, 2011 # Re: Sand-like noise on reflections with V-Ray materials
Well it turned out 🙂 As for the background, then you may have missed something, but everything is easy. Created curved Plain. Did all the exceptions described therein. Appointed to his luminous VRayLightMtl with texture in the Color slot. If you did everything exactly, but you see a dark background, it is likely that self-luminous brightness VRayLightMtl simply not enough to be bright enough to exposition scenes. It is very easy to adjust. For self-illumination brightness VRayLightMtl responsible numerical parameter, standing next to the color Color slot. You need to increase this value until VRayLightMtl will not be bright enough, the way you want it to see against the background of the window. For an idea of how to convert the file maksovsky new version * .max file earlier , such as 3ds Max 2011 and 3ds Max 2009 on the import of all models, read in the next branch deliberations😉


18 Dec, 2012 coolerman
18 Dec, 2012 # Re: Sand-like noise on reflections with V-Ray materials
Hello! Long time no see 🙂 In order not to produce threads, ask here. Sometimes it turns out that one side of the wall is covered with "rash", I watched a picture in different scenes with completely different material settings: I tried to change the angle, but it does not help. Can that tell me?


3 Jan, 2013 Anton (Staff Author)
3 Jan, 2013 # Re: Sand-like noise on reflections with V-Ray materials
Hello, coolerman! This is a fairly standard bug. In VRayLight uncheck Affect reflections, if the lamps are using VRayMtl'y then lodge them in VRayOverrideMtl. His slot Base material - the current VRayMtl, slot Reflect material - VrayMtl with three times less intensity. In the settings Color mapping put the check Clamp output. The rash should disappear😉


3 Feb, 2013 kat
3 Feb, 2013 # Re: Sand-like noise on reflections with V-Ray materials
Hello dear team RenderStuff! I want to once again ask for help! I have the same problem - a rash in glossy reflections + materials change color, namely, where there was supposed to gloss black - speckled gray, glass practically do not reflect the whole picture is very noisy! It seems that all of the recommendations took into account, I can not understand what's wrong and twisted configuration, but with no result ... I hope very much for your help !!!


3 Feb, 2013 kat
3 Feb, 2013 # Re: Sand-like noise on reflections with V-Ray materials

3 Jan, 2013 Anton (Staff Author)
6 Feb, 2013 # Re: Sand-like noise on reflections with V-Ray materials
Hello! Take advantage of other imeydzh hosting .


18 Dec, 2012 coolerman
2 Jun, 2013 # Re: Sand-like noise on reflections with V-Ray materials
Hello! On the tile material from the faces appear strong glare (mark 3). On the wall is 1.2 okay. I understand that this is due to a bump, difuz and Reflect cards in order. How can I fix this?


3 Jan, 2013 Anton (Staff Author)
9 Jun, 2013 # Re: Sand-like noise on reflections with V-Ray materials
Coolerman, hello! To be honest it is not clear that it does not suit you. From this angle, the camera on the bevel of individual plitochek reflected ceiling white / light on the ceiling. This is quite normal. How to get rid of the glare? -Removed Source reflections or mute the reflective properties of a mat tile😉


22 Oct, 2013 kumana
22 Oct, 2013 # Re: Sand-like noise on reflections with V-Ray materials
Good day to all! Please help me here with these ugly white "rash spots" where there should be a blurred reflection. I tried to change the method of anti-aliasing on Fixed image sampler, but nothing happened, only a rash elsewhere. That rendering with Adaptive subdivision image sampler Here render settings Light source - light sphere furniture materials


3 Jan, 2013 Anton (Staff Author)
22 Oct, 2013 # Re: Sand-like noise on reflections with V-Ray materials

Hello!


This is a standard bug scene with night lighting.

It is connected to the bright visible light sources, reflected in the materials , which can not properly handle rendering, particularly strong this effect is blurry reflections with BRDF type Ward.

To get rid of this rash you enough options VrayLight uncheck «Affect reflections», and last but not least, check whether not intersect with geometry Lite container.

Just I advise you to read the topic about what is true set the light in the ceiling of and also, splint about it, how to cover the interiors of night-Ray in the V 😉



22 Oct, 2013 kumana
22 Oct, 2013 # Re: Sand-like noise on reflections with V-Ray materials
Thank you, Anton!


21 Aug, 2014 Kazual
21 Aug, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Hello! Please tell me whether it is possible with the help of some options to control values ​​in Subdivs Reflect and Refract for all materials at the same time, or shall we say, pogrupirovat materials with similar values ​​in the fields Subdivs Reflect and Refract. I am trying to solve this problem by using Animation Parameter Editor in vain. Thanks in advance for your reply😉


3 Jan, 2013 Anton (Staff Author)
22 Aug, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Hello! That group - no, but globally you can use of Global subdivs multiplier . But then again, by definition, it affects all Subdivs renderer, not only on the mat. If you need it for animation, I could never have animated Subdivs animated and do not know whether it is the spinner. However, in cases where I can not get out in one scene, I'm doing a few, just with different settings, and then in turn render scenes from different dates of frames in one folder, and so get the "animation" renderer settings😁


21 Aug, 2014 Kazual
23 Aug, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Thanks for the reply, still very sad to hear that you can not like that "simply access" on Subdivs number to speed with etimi settings, and thank you, and yet 👌


1 Sep, 2014 madeleine
1 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Good afternoon, RenderStuff! First of all I want to thank you for your lessons! A bunch of useful things learned on this site! Spasiboooo! 3ds max doing recently. All Vray settings for your recommendations. The problem - I can not get rid of the terrible noise. Re-read various discussions on the site, tried to increase sabdivsy from Light, from the materials. Background outside expelled from the lighting and shading (shot daw Generate GI, Receive GI, Visible to GI, Receive and Cast shadows), the windows and curtains, too (and even curtains excluded from VraySun). Maybe I'm missing something, and in fact, everything is simple? HELP!


1 Sep, 2014 madeleine
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Conducted an experiment ... A total of 6 stage lights, not counting the bundles VraySun + VraySky + VrayLight skylight portal: 2 bedside lamp and 4 spot on the console. When the scene is three-Lite with sabdivsami 60-80, no noise, with the addition of each subsequent lights, noise increases and sabdivsami is not treated ... What to do?


2 Sep, 2014 gus_ann (3dsmax vray expert)
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
I do not know really want to help, but ... What can I say - it is necessary to understand their own. Let's refer to the scene, along with all the textures and ieskami, if they are present there. I will watch....


2 Sep, 2014 ILLYA
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Good day, dear team renderstaf! Do the visualization of the interior of a country house and was faced with a problem, the noise on the ceiling, stains and grit on the couch and on the inaccuracies in the rendering of small elements (blinds). (All marked on my renderer) In the scene used DaylightAssemblyHead (Vraysun and Vraysky) and Vraylightmaterial c texture outside the windows. Vrayfisicalcam with high ISO and f-number, vrayligh. Render is made with the recommended settings you vray Tried also improve the settings but to no avail. I would be glad to hear from you advice on how to correct these problems. Thank you in advance! 🙂


1 Sep, 2014 madeleine
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
IES file is not present, all lajty did just VrayLight sphere. Here is a link to the scene and textures https://www.dropbox.com/s/gllgh22wna2q0kj/archives.7z?dl=0


2 Sep, 2014 gus_ann (3dsmax vray expert)
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
madeleine, your version 3 D Max older than mine, so I can not open your scene. 🙄


1 Sep, 2014 madeleine
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Pechalka (((Anyway, thanks for the helpfulness 🙂 already tried to make IES lights, did not help in Vray Properties watched, there may daw what remove-put ... also does not affect ((


2 Sep, 2014 gus_ann (3dsmax vray expert)
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
But nothing prevents you survive for a younger version. For example, for the 2010th ...😉


1 Sep, 2014 madeleine
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
My max 2014 minimum for 2011 offers remain ((Here is a link can be opened ... More look for can find as for the 2010 save! Https://www.dropbox.com/s/gllgh22wna2q0kj/archives.7z?dl=0


2 Sep, 2014 gus_ann (3dsmax vray expert)
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
That's better? After all I was trying to fix something, changed the curtains material, turned off the lights, moved the window portals into the room - the result was lamentable. Then I decided that all of the curtains, hid them - did not help ... And then ... I did Unhide all! The program is said that there are some hidden layers, and I want them to see and also to unfreeze? I told her affirmative "yes". I went to the layers and there - my mother dear !!! It is unlikely that you create them yourself. And in general, is then anhayda render became clean with subdivs in light porridge 1000 and ceiling materials, curtains, I also poumenshala subdiv to 8. All the rest remains noisy - it is necessary to understand the materials. With the light you are fine, just move the portals into the room and uncheck Retrace threshold settings light porridge.


2 Sep, 2014 Oleg
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Hidden layers are likely added together with the finished models. And that's where it was, and, most importantly, how it affects the rendering? I thought that the hidden geometry does not affect the image: |


1 Sep, 2014 madeleine
2 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
gus_ann, thanks for the reply! I do as you said Unhide all, opened only one layer, which was hidden, and I knew about it - ceiling - it is removed, it is no longer needed. Photo layers enclose. On your renderer does not include spots on the console - if I had them turn off, then I, too, everything is clean, but if you include, the nightmare ((Screens enclose Galka Retrace removed..


2 Sep, 2014 gus_ann (3dsmax vray expert)
3 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
I do not know, I have all purely at IESkah included, I propose to use my corrected stage (2013 version). There can be any putannitsa with range, as I had to reconfigure it for their version of the program. But nothing, I think you will understand. http://f-bit.ru/500352 And what about the hidden layers, and whether they should affect the final render? In theory there should not. But that gave me the correct order and had to work, I just told how it happened and where I found all that. On the question "why" I will not answer, simply because I do not know why.


1 Sep, 2014 madeleine
3 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
In general for a long time I beat her head against the wall ... but still achieved😁 Anhayd, as I wrote was not helpful. Fiddle with the scale, but it is also not in it turned out. And it turned into a check mark🙂 Thanks for the correction gus_ann scene - I started to collate settings that you set, and that was me. Like anything you did not change significantly until ... I came across a paragraph Probabilistic Lights in switches of Global (the VRay 3)! In earlier versions, it is not !!! I jackdaw is, and you removed it, but perhaps not realized that it was she freed from the noise. Now, everything is OK! Uraaaaa:! D Screen Global switches (VRay 3)


2 Sep, 2014 gus_ann (3dsmax vray expert)
3 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
😁 I have not cleaned this show, I just do not have it. My yard is also vie ancient yours. I'm glad that was able to help!


2 Sep, 2014 gus_ann (3dsmax vray expert)
3 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
For the future, it is also useful to know me, yet ever and I have to move to Vray 3. I just do not understand with layers, that there is a layer, I appear like this:


1 Sep, 2014 madeleine
3 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Yes, when you give me your edited file is sent, I also have a question for all the matter🙂 This is probably because I have these layers in Russian written 🙄


2 Sep, 2014 gus_ann (3dsmax vray expert)
8 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Illya, you wrote before. What, after discussion did not help? What vie yard? What Max file? Link? How do you help it, not knowing the stage and settings? I've got all shot down after the scene view ve Ray 3.0, and Max 2014 until pereustanovila- send.


2 Sep, 2014 ILLYA
8 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Page http://www.ex.ua/125476844095 there is no texture, but I think without them will be visible issues that I have described above. Thank you!


2 Sep, 2014 gus_ann (3dsmax vray expert)
8 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
ILLYA,😉 Web page is not available.


2 Sep, 2014 ILLYA
9 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials

2 Sep, 2014 gus_ann (3dsmax vray expert)
9 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
ILLYA, well navertel !!! I did not at first realized that there with the light - and a compass and light house .... HDRI Light in your house could easily ensure a similar rash. If you open your scene and replace all materials on the VRayMtl standard gray, then you will see that it is clean, there is nothing no noise and no rash. However, I was wondering - why develop a rash, I here and what geometry poudalyat, if that - to join again. I had to re-supply the lighting in your scene, from the ceiling material, I removed the noise map in the Diffuse slot, removing the background behind the window, I changed the sofa mat That's what I have now Above all - you have no windows to the portal, which of course brings into your scene additional lighting, which you and so many, (well, anything, to lower the glow of the sky), but also removes noise at the subdivision surface is 60. As for the noise blinds - they do not make noise, just the geometry of their very thin and small at the resolution that you use so it looks at high resolution will be all right, after all, you should read this one lesson, and take advantage of the advice given in it. This is just your case. http://renderstuff.com/gi-engines-vray-tutorial-179/ Link on my stage. http://f-bit.ru/503889 In the future - not to apply that light, which is not fully understood, do it on the test scenes for yourself.


2 Sep, 2014 ILLYA
11 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
Thanks for the help! 👌 That was not domlayt and Daylightassemblyhead. In general, I removed it at home, put a normal Vraysun. Put outside Vraylight, subdivs 60. removed the background just in case. And in your revised stage, I did the same. But the rash remained, and it is on those sites where Reflection glossines is about average. In those places where there should be a blurred reflection of the individual-appear bright dots. You also have to render-supervision, and on back of the sofa and the ceiling slightly. I twisted parameters Irradience map and DMC sampler. almost nothing has changed. Tell me, is it possible to somehow get rid of it!


2 Sep, 2014 gus_ann (3dsmax vray expert)
11 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
I do not know, there was a rash, just need to put each window portal. There are no scars, there is a general noise that is corrected subdivs Lite. Not 60, put 120. I have no portals in the scene, like you, mind-my scene much cleaner yours. Noise material subdiv Screw him. But this clumsy question, but rather the solution. Something there gives noise. Why is the replacement of the standard mat is not noisy? Perhaps there kosyachny model look-elimination (hide selection). But, in fact, your lighting is not right, or rather underdeveloped. I just do not know how you did it, but I know how to get rid of it. Just at random. What and how I do not know, just like you, who created this thread and the whole scene. Alternatively Replace the mat on a standard couch wi yard. Then make your. The same with the ceiling, right now, I'm even more abruptly ....


2 Sep, 2014 gus_ann (3dsmax vray expert)
11 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
What you ve yard? Version?


2 Sep, 2014 ILLYA
12 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
V-ray Adv 2.30.01 With divorce on the couch I figured out there was a noise, which strangely behaved. From rashes like helping wrap subdivs laytpleyna materials and, as you said. Say you do not know how to wind subdiv Vraysky or Vraysun, as well as in Vraylightplane? in their settings, I have found this can be somewhere else?


2 Sep, 2014 gus_ann (3dsmax vray expert)
13 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
The sun itself is not noisy, noisy its transition from shade to sun spots, especially evident if you have not increased the size of the sun. Solar flare will be blurred, its boundaries are not clear and loud. To affect this setting can be here A standard sky no settings subdivs, by default it also prevents noise, but if I use Vray Dome and to prescribe to the HDRI, in this case it is necessary to use only high quality the HDRI, in addition to the final render is necessary to raise its resolution, that is, the quality of its image, render. In this case, not only the image of the sky itself (HDRI) to calculate the clear, no noise, but the lighting is not very noisy, as the HDRI map and have our lighting. The better the quality of it, the better rendering. The default is 512. How do I know what value to put? Well, you need approximately 512 times the 4. It is not enough - to raise enough - can be reduced. This method of selection and not otherwise.


2 Sep, 2014 ILLYA
13 Sep, 2014 # Re: Sand-like noise on reflections with V-Ray materials
It would be helpful, thanks for the info 👍


8 Oct, 2014 SvetlanaDM
8 Oct, 2014 # Re: Sand-like noise on reflections with V-Ray materials
I want to share a strange situation. In general, I modeled the wardrobe in one scene, the scene smerdzhila bathroom. And already from this room into another scene. Start making render - all noise, black rash on the mirror. Tormented, twisted different settings, increases everywhere subdiv, and then simply remove all merdzhennye objects and put them already from the initial stage - and cheers - everything is clean! No one can explain why?


20 Apr, 2015 nordson
20 Apr, 2015 # Re: Sand-like noise on reflections with V-Ray materials
Hello! Already half a year on your website, learning mostly on lessons gus_ann , but can not overcome the noise. It's in this stage, as I understand it, the portal noise outside the window, whatever the number of subdivs he did not put up: Noise at all white surfaces, facades and ceiling, if you click the first image will be visible on approach to 100 percent. If you put a daw store with ir.map, the noise just disappears (or twist min.shading rate in the settings): But you do not recommend to put this checkbox. And there is a question about FMD postprocessing . Thank you 🙂


20 Aug, 2015 yura.
20 Aug, 2015 # Re: Sand-like noise on reflections with V-Ray materials
How to treat that's so much noise?


26 Aug, 2015 Darya
26 Aug, 2015 # Re: Sand-like noise on reflections with V-Ray materials
Hello! Tell me how to get rid of noise in the rendering? Worth 1000 subdivs light cache. Irradiance map (primary bouns) - very high. Subdivision surface in the materials 20 in Reflect. antiliasinga filter is not necessary. We used adaptive dmc. How to achieve a better quality? Thank you very much for your answers.


1 May, 2016 mari
1 May, 2016 # Re: Sand-like noise on reflections with V-Ray materials
Hello! Please advise how to get rid of noise in the shadows. And it only happens with dark materials ...


3 Jan, 2013 Anton (Staff Author)
9 May, 2016 # Re: Sand-like noise on reflections with V-Ray materials
Hello! To get rid of noise in the dark areas of a scene or materials, firstly, increases VrayLight Subdivs, it will improve the accuracy of the shade of the gradient, and secondly, increase the setting the DMC a Sampler , that globally affect the overall accuracy errors. Of course, increasing the setting will cause an increase in rendering time, but otherwise nothing.


11 Oct, 2016 yeah
11 Oct, 2016 # Re: Sand-like noise on reflections with V-Ray materials
Render in Vray silver ring. On the inner surfaces of the noise. Tried to put metal subdiv and IP by 32. The result is the same (The main thing is that when rendering large image (1000x600px) noise extends much further - the picture, as it were not calculated to kontsa.A when included with the Track mouse cursor is put in a place-or, this area is fully calculated, and the rest of the image becomes even more shumnym.Pri render in gray mat everything is OK, but there is noise in the shadow of the deepest portion of presence / absence of clear stones on the noise does not affect -.. tried without settings. : IM medium + LC


3 Jan, 2013 Anton (Staff Author)
19 Oct, 2016 # Re: Sand-like noise on reflections with V-Ray materials

Hi,

This is a standard rash from "extremely" bright glare sources in reflections. The approximate "nature" of this bug is such that the formation of colors of pixels on reflective materials is formed in the LDR space, where the gray gradient, responsible for the brightness of the color, say, is represented by 256 gradations. Where 0 - absolutely black color, and 256 - absolutely white color. That is, first the color hue is calculated, and then multiplied by the brightness value and so we get the final pixel color on the reflection.

The brightness values ​​involved in forming the final color of reflection are taken from the scene objects, which are reflected in this reflection. Such an object can be, as a neighboring object, illuminated by a light source, and the bright light source itself. And here is the key point. The fact is that the brightness of the visible light source goes beyond the limits of LDR, because the value of its brightness is in the HDR space.

What does this mean in practice? And the fact that the LDR algorithm for the formation of the final colors of pixels "waits" for values ​​in the 0-256 side, but the same light source can transmit values ​​tens of times greater than 256, for example, 122323435445 (in fact, the HDRI brightness format is a "floating comma", but For simplicity, let it be as in the example). As a result, whatever the hue has been multiplied by the value of the multiply expected maximum, we get the maximum value of the LDR color space, that is, the white pixel. It is these "anomalously" white pixels that are the same noise or white rash in reflections.

Nominally, to eliminate LDR transmission to the final color calculation algorithm, the brightness value exceeding 256 is called the "Clamp output" algorithm in Color Mapping. It literally "cuts" any value exceeding 256 to 256. Even if the value 122323435445 comes, then this algorithm will cut it to 256i. As a result, an abnormally bright pixel in an unexpected place does not appear.

What except for visible light sources in reflections can give such a rash?
It can be given an HDR environment map, because the brightness values ​​of such a card are HDR, not LDR.
It can be a self-luminous material with a high brightness value.

What if you, say, want to render the final rendering itself in HDR format and therefore you can not activate "Clamp output"?

Then you have to go to the tricks.

For the IC, turn off visibility in reflections (check "Affect reflections").
For bright self-luminous materials - use a lower intensity of the glow itself or replace the reflective properties while maintaining the properties of the glow.
For HDR, a short as a substitute for a real environment is not to use such cards at all, but to simulate a real environment.

In particular, for jewelry, you need to recreate the Photo Light Box. In 3d, this is even easier to make than the real world😉



26 Dec, 2016 Yana
26 Dec, 2016 # Re: Sand-like noise on reflections with V-Ray materials
Hello! Such problem: Horrible noise on the mat, the floor does not reflect, though reflekst worth, and dark outside, but the frame is overexposed, the problem can be ???


3 Jan, 2013 Anton (Staff Author)
1 Jan, 2017 # Re: Sand-like noise on reflections with V-Ray materials
Hi, You have one problem creates another. No glare in reflective materials, because there is nothing to reflect, and there is nothing, because the main source of glare in your scene - it is the light from the window. And there you have, apparently, dark VRaySky. Since it is dark, and the half-dark room, and the shadow of "love to make noise." This is possible, at least for two reasons: - the VRaySun container, which linked into VRaySky, raised high enough relative to its target with (VRaySun.Target) and generates VRaySky "evening" gradient. - In the settings of the VRaySky set a very low value «sun intenity multiplier». It is necessary to increase it and the background behind the window becomes brighter. If you on the background of the window is not the VRaySky (I can not see the settings and only guess), but, for example, raster map (texture), that are similar - it is dark. Make the background behind the window lighter and in general to the windows is something shining (I can not see if there you have some IP), then there will be and the glare on reflective materials (will it reflect), and noise in the shadows (which is less than shadows over light areas). Only then can we judge whether you need to do something else if the noise continues to be unsatisfactory.


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