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My V-Ray concerns -- please tell me I'm wrong.

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  • My V-Ray concerns -- please tell me I'm wrong.

    I'd like to submit some very stratospheric thoughts and concerns I have about the way V-Ray is going and pick your brains on these--both users and Chaosgroup folks.
    For a few releases now, I've been growing slightly uncomfortable about the direction V-Ray has taken in respect to the kind of stuff I do.
    Like many of V-Ray's early users, I mainly dabble in archviz, especially interiors and especially complicated ones, with heavy geometry and complex shaders, which I generally render on a single machine. As you know, these are among the most demanding types of scenes for any renderer given the amount of indirect illumination. Yet I've been finding myself more and more in the situation of working on a scene--almost always an interior--that V-Ray is just not able to render in an acceptable time. When that happens, I generally find myself forced to switch renderer. Whenever I release one of my projects and it doesn't use V-Ray, it usually is the reason why.
    I'm not sure why this is happening, but it seems to me V-Ray has become gradually less efficient at rendering the type of scenes I do. Four or five years ago, I could render this or this completely noise-free using BF/LC with little optimization and a much lesser rig than I have now. Then, a few releases later, around the time when the universal settings began to fail, render times for these kinds of scenes (using BF) began creeping up. That's when we started to have to tweak glossy subdivisions on each materials and multipliers on lights. Today, I'm not sure that I could render these scenes on my current machine using BF in an acceptable time.
    This just happened to me again this week, having modeled and shaded an entire, complex, interior scene with many lights and a large 3D exterior around it, I found rendering it impossible, even with the new denoiser. Switching to another renderer solved the problem. Sure, it's never fast, but V-Ray seems to grind to a halt above a certain threshold when another renderer doesn't.
    Don't get me wrong. I love V-Ray and I even like the way its development has gone lately--including the attempt to simplify settings, the fantastic GGX shader, etc. But I wonder if the refocusing on the film and advertising industries in the past few years and on big studios that work with render farms as a matter of course haven't resulted in making V-Ray less suited to the kind of work I do and to rendering on single machines.
    (And by the way, I completely realize that the way I work is not typical of V-Ray users in general and that few people do all their rendering on their local machine these days)
    Still, would love to hear others' thoughts on this.
    Check my blog

  • #2
    First, your example images are incredible. I know you are comparing your previous render times to your current ones, but my experience with my new machine, is render times are not relevant anymore. What was taking me hours is now taking minutes. I am able to render heavy exteriors in about 20 minutes and interiors about 40 minutes. Have you tried to roll back V-Ray to see if it isn't something else causing the slowdown?
    Bobby Parker
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    My current hardware setup:
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    • #3
      Hmm, bit of an odd one. If anything going towards film is going to test the render even further, I was working on a jet asset from a recent summer blockbuster and with the amount of supplied materials and layers of maps, it was 22 gigs of ram to render just it on it's own. A focus on film effects means support for more geometry, more textures and aa that's good enough to cover camera motrion blur and dof in certain cases. Forest, railclone and other instancing programs are throwing in massive amounts of geometry.

      It'd be interesting to profile one of your scenes and see what the makeup of it is, at the minute it kind of sounces like it's made up of "lots of everything" which should be a decent test. How's your machine doing for memory? Have you started converting your large textures into multires exr or tx? A lot of the jobs I've done recently have to be put through a farm with only 24 gigs of ram per machine so I've had to make sure we were using textures that could down res themselves for smaller on screen amounts.

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      • #4
        Originally posted by BBB3 View Post
        This just happened to me again this week, having modeled and shaded an entire, complex, interior scene with many lights and a large 3D exterior around it, I found rendering it impossible, even with the new denoiser.
        I would very much like to take a look at a scene like that. You do realize that we don't make V-Ray slow on purpose, right We have spent considerable time optimizing the render times and memory usage, but as always there might be things that we've missed. Oftentimes they may be stupid things which you can't notice as a user, but if we get a chance to profile such a scene, we could fix them. I realize that it's easier to switch to another renderer that handles that particular scene rather than get back to us, but if it's possible, it would be of great help.

        Best regards,
        Vlado
        I only act like I know everything, Rogers.

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        • #5
          Sounds a bit odd to me, my scenes are never light either and comparable in complexity to yours (I'm not saying they are as visually pleasing of course) yet Vray doesn't have any problems with them and I render all of them on my main workstation as well. (dual xeon, 64gb ram). There might be something else going, although I don't suspect you making rookie mistakes.
          A.

          ---------------------
          www.digitaltwins.be

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          • #6
            I did recently render a very, very simple toilet interior that took HOURS using BF/LC, which was quite a shock, given that the week before I rendered an outdoor scene with billions of polygons (via forest pro) in about 40 minutes using similar settings.
            Check out my (rarely updated) blog @ http://macviz.blogspot.co.uk/

            www.robertslimbrick.com

            Cache nothing. Brute force everything.

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            • #7
              Believe me, I would like nothing more than to be able to stick to V-Ray. I don't have fun redoing all my shaders every time. Also, I really don't want to rule out a personal mistake--I've been using V-Ray for a long time, but I never bothered much about the tech behind it.
              I'll try to pack this latest scene for Vlado to look at. Regarding the other comments, I don't often find these sudden spikes in render times to be mainly a function of the complexity of the scene. Rather, it happens when the lighting scenario becomes tricky. The scene I'm talking about is a rather confined interior with a big exterior around it, lots of bouncing light that needs to travel a long way before it hits the interior.
              Exteriors of any kind, however complex the geometry or the shaders, are never a problem.
              Also, V-Ray is not alone there. While I've found some renderers to be very sturdy in their ability to render even problematic scenes in a predictable time, others, especially unbiased GPU-based renderers, are lightning-fast on simple scenes or scenes without much bouncing light but show this very sudden and steep spike in render time on enclosed interiors once you get beyond a certain level complexity.
              Check my blog

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              • #8
                Originally posted by Macker View Post
                I did recently render a very, very simple toilet interior that took HOURS using BF/LC, which was quite a shock, given that the week before I rendered an outdoor scene with billions of polygons (via forest pro) in about 40 minutes using similar settings.
                Exactly what I mean. Exteriors of any kind are not what I'm taking about. I still do these in V-Ray and they always rock, it's getting a clean and fast GI that's become a problem for me.
                Check my blog

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                • #9
                  Ok then, will wait for that scene - let me know if you need FTP storage to upload it.

                  Best regards,
                  Vlado
                  I only act like I know everything, Rogers.

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                  • #10
                    Originally posted by Vizioen View Post
                    Sounds a bit odd to me, my scenes are never light either and comparable in complexity to yours (I'm not saying they are as visually pleasing of course) yet Vray doesn't have any problems with them and I render all of them on my main workstation as well. (dual xeon, 64gb ram). There might be something else going, although I don't suspect you making rookie mistakes.
                    I may well be making rookie mistakes. But even if I do, these are mistakes I've been making all along and they didn't use to be a problem. These days, I have to disable all caustics, remove shadow-casting from glass windows, etc. to get decent speed, and very often, it's not enough.
                    Check my blog

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                    • #11
                      Originally posted by vlado View Post
                      Ok then, will wait for that scene - let me know if you need FTP storage to upload it.

                      Best regards,
                      Vlado
                      It'll be a simplified version without the vast forest outside, but hopefully you'll see right away what the problem with it is.
                      Check my blog

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                      • #12
                        This got interesting. For the quality and complexity of the scenes of BBB, will be a big challenge for Vlado and his team can help improve performance indoors. Especially when light domes are used.

                        I think many users will be looking forward.

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                        • #13
                          Originally posted by AndresAhumada View Post
                          will be a big challenge for Vlado and his team can help improve performance indoors.
                          We'll see how it goes, shall we We do have tricks up the sleeves..

                          Best regards,
                          Vlado
                          I only act like I know everything, Rogers.

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                          • #14
                            OMG!!! : o

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                            • #15
                              Originally posted by BBB3 View Post
                              It'll be a simplified version without the vast forest outside, but hopefully you'll see right away what the problem with it is.
                              if you are forced to switch to a renderer mid/end of your project there is obviously something wrong. I'd like to take a look at that simple toilet scene too. Generally speaking, attribute for attribute or feature for feature vray can match most of the renderers out there. So I wonder, by switching to a different render engine and I would assume you were able to render that scene faster, are you sacrificing some settings / quality that you were using in vray before?
                              Dmitry Vinnik
                              Silhouette Images Inc.
                              ShowReel:
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