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V-ray questions

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  • S Offline
    solo
    last edited by 3 Apr 2009, 04:26

    Vray guru's, I need some help please.

    below is an image of a render in progress, it's a studio setup that has blotchy artifacts in the shadows, how does one overcome it?

    Secondly, glass! wtf! why is it so frigging difficult to create a decent low-e glass, with just enough reflection, zero refraction witout it looking like wax?

    Thirdly, I want to use an hdr image for reflection, but it does not work great, I get a slight reflection or a major one, never inbetween, any pointers?


    http://img7.imageshack.us/img7/594/artifactsi.jpg

    http://www.solos-art.com

    If you see a toilet in your dreams do not use it.

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    • S Offline
      Stinkie
      last edited by 3 Apr 2009, 07:18

      • blotches: Irradiance map > subdivs > up 'em

      • glass: http://asgvis.com/index.php?option=com_remository&Itemid=0&func=select&id=16

      • hdri: dunno, me stupid.

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      • S Offline
        solo
        last edited by 3 Apr 2009, 07:37

        Thanks stinkie.

        I thought I'd read everything in the vray pdf, page 69...there it was. πŸ˜’

        http://www.solos-art.com

        If you see a toilet in your dreams do not use it.

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        • T Offline
          thomthom
          last edited by 3 Apr 2009, 07:41

          @solo said:

          Thirdly, I want to use an hdr image for reflection, but it does not work great, I get a slight reflection or a major one, never inbetween, any pointers?

          From the same angle of view? Got screenshot examples?

          Thomas Thomassen β€” SketchUp Monkey & Coding addict
          List of my plugins and link to the CookieWare fund

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          • S Offline
            solo
            last edited by 3 Apr 2009, 07:50

            'fraid not, as I cancelled the render when it looked wrong.

            Do you have any links to a more indepth hdri tutorial for vray, the starter pdf is a little vague.
            and maybe even some good interior hdri images for getting some reflection on glass and metal?

            http://www.solos-art.com

            If you see a toilet in your dreams do not use it.

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            • T Offline
              thomthom
              last edited by 3 Apr 2009, 08:13

              I've only used exterior sky HDRI for reflections. I rarely do interior shots.

              Are you looking at the manual for VfSU? There's lots of good info to find in V-Ray for Max. http://www.spot3d.com/vray/help/150R1/index.htm <- good source of information.

              I also ask around on the ASGvis forum allot. Damien, ASGVis' product manager, is often there and answers some really good in-depth answers.

              Thomas Thomassen β€” SketchUp Monkey & Coding addict
              List of my plugins and link to the CookieWare fund

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              • T Offline
                thomthom
                last edited by 3 Apr 2009, 08:28

                @solo said:

                below is an image of a render in progress, it's a studio setup that has blotchy artifacts in the shadows, how does one overcome it?

                In the DMC Sampler section of the Options. Is the adaptive Amount set to 0.85?
                You are likely to get splotches if this is set to 1.

                Thomas Thomassen β€” SketchUp Monkey & Coding addict
                List of my plugins and link to the CookieWare fund

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                • S Offline
                  solo
                  last edited by 3 Apr 2009, 08:33

                  aha!, it was set on 1.

                  I will change it and try again, thanks. (I wish I understood what all these settings actually mean)

                  http://www.solos-art.com

                  If you see a toilet in your dreams do not use it.

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                  • T Offline
                    thomthom
                    last edited by 3 Apr 2009, 08:36

                    @solo said:

                    (I wish I understood what all these settings actually mean)

                    Ditto. But I only know what a few of them do. Damien tends to answer this stuff pretty good if you ask specific questions.

                    Thomas Thomassen β€” SketchUp Monkey & Coding addict
                    List of my plugins and link to the CookieWare fund

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                    • S Offline
                      solo
                      last edited by 4 Apr 2009, 10:33

                      Whats the largest render size in vray?

                      I seem to have 2046x1536 at 96 DPI is this the biggest?

                      I normally need to render 9,5x11" at 300 dpi for publication which is 3300 x 2850cm at 300DPI, is this even possible with Vray?

                      http://www.solos-art.com

                      If you see a toilet in your dreams do not use it.

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                      • T Offline
                        thomthom
                        last edited by 4 Apr 2009, 10:38

                        @solo said:

                        Whats the largest render size in vray?

                        I seem to have 2046x1536 at 96 DPI is this the biggest?

                        I normally need to render 9,5x11" at 300 dpi for publication which is 3300 x 2850cm at 300DPI, is this even possible with Vray?

                        Yes. No problem. The buttons are just presets. Type in any size you want.
                        You can do some really large renders, but at some point you will have to render to file (.vrimg) in order to prevent running out of memory.

                        Thomas Thomassen β€” SketchUp Monkey & Coding addict
                        List of my plugins and link to the CookieWare fund

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                        • T Offline
                          thomthom
                          last edited by 4 Apr 2009, 10:44

                          If you ever need to render really really large.
                          http://asgvis.com/index.php?option=com_content&task=view&id=16&Itemid=57

                          Thomas Thomassen β€” SketchUp Monkey & Coding addict
                          List of my plugins and link to the CookieWare fund

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                          • S Offline
                            solo
                            last edited by 4 Apr 2009, 10:47

                            My 'Doh!" moment of the day, of course you can, what was I thinking?

                            Another one, how can I get a texture more crisp, I have a very low value bump 0.5 and low reflections set but the texture still seems ever so slightly blurry (customer did not pick it up but I did)?

                            http://www.solos-art.com

                            If you see a toilet in your dreams do not use it.

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                            • S Offline
                              solo
                              last edited by 4 Apr 2009, 10:50

                              Where can I get a VrimgtoExr converter?

                              http://www.solos-art.com

                              If you see a toilet in your dreams do not use it.

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                              • T Offline
                                thomthom
                                last edited by 4 Apr 2009, 11:23

                                @solo said:

                                Where can I get a VrimgtoExr converter?

                                http://asgvis.com/index.php?option=com_remository&Itemid=0&func=fileinfo&id=277

                                Main Download page: http://asgvis.com/index.php?option=com_remository

                                ASGVis' website is a pain to navigate after did had a redesign some months ago. They realise this and have a new version in progress.

                                http://www.vray.com/vray_for_sketchup/ vray.com is also a good resource.
                                http://www.vray.com/free_vray_tools/

                                @solo said:

                                Another one, how can I get a texture more crisp, I have a very low value bump 0.5 and low reflections set but the texture still seems ever so slightly blurry (customer did not pick it up but I did)?

                                Hard to tell without seeing. But I assume you used a highres texture?
                                You could try the image samplers: http://www.spot3d.com/vray/help/150R1/examples_image_sampler.htm#ex5

                                Thomas Thomassen β€” SketchUp Monkey & Coding addict
                                List of my plugins and link to the CookieWare fund

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                                • S Offline
                                  solo
                                  last edited by 5 Apr 2009, 05:54

                                  Thanks for those links mate.

                                  Yeah the website is a mess to navigate.

                                  I overcame the texture issue, I got a clue from Nomeradona on the Podium site about increasing the texture reflection subdivisions and it worked like a charm.

                                  Now I ask yet another one... I need to show reflection on glass and some brushed aluminium, but I do not want to use a background image or hdri atmosphere, I was hoping that I could force reflections only on the reflective surfaces. In Vue one can force a reflection map globally for all reflective surfaces without effecting the lighting, is this possible with Vray?

                                  http://www.solos-art.com

                                  If you see a toilet in your dreams do not use it.

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                                  • T Offline
                                    thomthom
                                    last edited by 5 Apr 2009, 09:36

                                    Yes. You can do that on a global level if you go to the Reflection map in the enviroment. Or on a per material level by setting the Reflection map in the Maps section of the material.

                                    Thomas Thomassen β€” SketchUp Monkey & Coding addict
                                    List of my plugins and link to the CookieWare fund

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                                    • D Offline
                                      dalomar
                                      last edited by 7 Apr 2009, 20:10

                                      I just happened to be sticking my head in over here, so I figured I'd answer the Adaptive Amount 0.85 question. There are two main techniques that V-Ray uses to speed up a rendering; Early Termination and Importance sampling. I won't discuss the first one (that's another post), but the second one is basically the idea that values that have more potential to affect the scene should be sampled more accurately. In layman's terms, brighter areas get sampled more than darker areas do. The Adaptive Amount setting controls how much of a fall off happens between sampling the brighter areas and darker areas. We want some sort of fall off as that will make the rendering quicker, but with too much of a fall off darker areas my be undersampled leading to splotchiness and other issues.

                                      The "goldilocks" number for this setting is 0.85. Any higher (>.85) and the sampling can be compromised. Any lower (<.85) and the rendering will likely be slower without much visual difference. Note that this is more of an issue when working with Irradiance Mapping for primary bounces. If you happen to be using DMC, they you can increase this a little higher than .85 (but still not to 1) without as much of a chance for artifacts.

                                      Damien Alomar
                                      Product Manager | V-Ray for SketchUp/Rhino
                                      [ASGvis](http://www.asgvis.com)

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                                      • S Offline
                                        solo
                                        last edited by 8 Apr 2009, 14:17

                                        Damien, thank you for taking the time out to explain some of the technicalities of Vray and welcome to SCF.
                                        It's always a good thing when developers are able to consult and advise on open forum, I know you are very active at ASGvis and glad you have also 'broken the seal' here too.

                                        My next question is regarding displacement (I'm sure that this is a well covered subject on the vray site, but for those who are new or in a deciding capacity as far as render engines goes I will ask my questions here)

                                        I have been trying to master displacement on simple objects before using it on any real projects, I have noticed that it totally kills render times which is expected and in line with most other render apps. I have found a few strange behaviors however, below is a simple SU model with a grass displacement on it, it rendered perfectly the first time but when iI decided to add the white band the render was flat without any displacement, I then made the band a group and rendered and it worked again giving me the result below. My question is... does the grouping of two material adjacent to another where one is displaced and the other not have any significance?


                                        http://img25.imageshack.us/img25/474/vraydisplacementsetup.jpg

                                        [flash=560,340:2rgr8gua]http://www.youtube.com/watch/v/fBDTBV8qNWg[/flash:2rgr8gua]


                                        http://img515.imageshack.us/img515/9630/grassdisplace8.jpg

                                        http://www.solos-art.com

                                        If you see a toilet in your dreams do not use it.

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                                        • A Offline
                                          AcesHigh
                                          last edited by 8 Apr 2009, 17:21

                                          this grass worm is really alien!

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