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Heavy Scenes Renderstart-Times extreme slow

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  • #16
    deyan.hadzhiev No. They are just in the network and accessed by a shared drive.
    There no Assets in the contentbrowser used. I think I will figure out later what cause this but now iam very much in Deadline-panic.

    Doger Yes, as I said. Iam using V-RAY 5 Proxies too. Why are you asking? They are also stored in the Network. But Currently I think its not related to the network, displacement, proxies or contentbrowser.

    I test that later on.

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    • #17
      Because there is definitely still a bug with VRay proxies when they are scattered. Apparently the textures of the proxies are duplicated more and more which leads after a while to the scene getting bigger and bigger after each save. Sometimes my 300mb scene became 7gb and it took forever to open it or start rendering.

      Here is a small video showing the bug:


      Maybe this leads to the huge render start times?
      If you take a proxy out of the cloner and turn off all cloners you can open the proxy manager. Then everything is corrected until the next save.

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      • #18
        Weird bug. But thats not what I experience. Its that when hitting the Production Render Button it takes about ten minutes or so then V-Ray decides to start to prepare the scene and so on. Thats horrible. Its so slow

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        • #19
          I am happy to see that I am not alone with this problem. Heavy scenes sometimes really start a few minutes later to render.
          I have this, too on several kind of scenes... Once with many and large displacements, also once without any displacement but a lot of polygons... or for example with big terrains and grasskit... (multinstances olny without grasskit works better)

          For example the scene with large displacement starts indeed earlier to render when displacements are switched off...
          But sometimes it drives you crazy, compiling geometry starts after a few minutes ( and yes sometimes after 10 minutes)... IPR is in such cases much faster..

          PdZ : Maybe you can confirm... take such a scene with default render settings, but reduce the Noise Treshold to let's say 0.05 just for testing. I experienced, then it starts earlier to render... I know it is not an ideal value, but maybe it shows CG where to look for this problem? I am not a programmer, only what I am experiencing...
          Last edited by haniel1107; 10-07-2021, 04:50 AM.

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          • #20
            haniel1107 I will check that. But it seems something else is going on. Pls watch the video. V-Ray starts after 5 minutes and 30 seconds. Before that seemingly nothing happens. There is a bit of networkusage at the start and then 5% CPU (1 Thread is running). Nobody knows what happens. Its horrible because imagine waiting always 5 minutes before V-Ray even starts...

            I will know make tests to figure out what is going on here. Seems veeeeeeeeery weird. Displacement is off btw.

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            • #21
              I have experienced the same. And now imagine you like to render an animation locally.... No fun.
              But would be great to see, if you could compare it by using the same file with a Noise Treshold like 0.05.... only one frame, to see if it starts earlier...?

              Thanks!!!

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              • #22
                Hey haniel1107 it has nothing to do with rendersettings it seems. I figured out what the culprit is. It seems V-Ray 5 has somewhat a big problem with many clones/instances. I try to figure out what exactly. Because even only grass is in the scene -> Scene hangs like in the video.

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                • #23
                  Yo I found out what is happening. And the result is somewhat fatal.

                  So it seems V-Ray 5 has a BIG PROBLEM with clones/instances.
                  The more instances/clones are in the scene, the slower it becomes to start.

                  I know that this is NOT happening with V-Ray 3.7. Iam currently rendering a scene with millions of clones in 3.7. It starts almost immidiatly.

                  That is horrible. I just have 16000 clones of a flower but V-Ray starts after 5 minutes or so (incl. the whole scene).

                  I will test more.

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                  • #24
                    Here 15000 plant clones load in seconds, your best bet is always to send scene to developers so that they can check what's wrong in the scene
                    3D Scenes, Shaders and Courses for V-ray and Corona
                    NEW V-Ray 5 Metal Shader Bundle (C4D/Max): https://www.3dtutorialandbeyond.com/...ders-cinema4d/
                    www.3dtutorialandbeyond.com
                    @3drenderandbeyond on social media @3DRnB Twitter

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                    • #25
                      A couple more tests, scattered geometry 8.000 polygons, 150.000 clones took 12 seconds, 1.500.000 clones 30 seconds, I'm using a cloner with multi instances
                      3D Scenes, Shaders and Courses for V-ray and Corona
                      NEW V-Ray 5 Metal Shader Bundle (C4D/Max): https://www.3dtutorialandbeyond.com/...ders-cinema4d/
                      www.3dtutorialandbeyond.com
                      @3drenderandbeyond on social media @3DRnB Twitter

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                      • #26
                        Dont know why this happens to me but I have bad news.
                        I just made a scene with one cloner which has a cube in it with 200x200x10 Cubes as Renderinstances. In 3.7 it was fast as always. In 5 it was horrible slow.
                        In the scene theres nothing. Not even light. Just a camera and Cloner with Cubes. Not even a material is in the scene. I checked it a lot with different setups. Its always when there are a lot of objects in the scene.

                        I tested it with V-Ray 5 for C4D R23 but I tested it also with R21 V5. Its the same...

                        Here the Video:


                        I also tested it with GPU Render of V-Ray but as I said: It has nothing to do with Rendersettings, Materials or anything. It seems V-Ray 5 has translation-problems from Cinema Polygones to V-Ray internal proceeding.

                        Which leads to horrible starttimes the more instances you have. Doesnt matter if these are proxies or geometry. I tested it with Null-Objects instead of geometry. V-Ray starts immediately. But if there is instanced geometry, nope.

                        Ok now I see... it seems its a problem with Renderinstance itself.

                        If the cloner is set to instance. Its fast as 3.7. Is it converted to single objects. Its fast. BUT if its set to renderinstance or instances as renderinstances then.... slow motion-Terror happens.
                        Last edited by PdZ; 12-07-2021, 08:24 AM.

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                        • #27
                          I’ll try the same setup to see if I’m getting different results
                          3D Scenes, Shaders and Courses for V-ray and Corona
                          NEW V-Ray 5 Metal Shader Bundle (C4D/Max): https://www.3dtutorialandbeyond.com/...ders-cinema4d/
                          www.3dtutorialandbeyond.com
                          @3drenderandbeyond on social media @3DRnB Twitter

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                          • #28
                            I hope I replicated the scene setup, cloner with 100x100x10 render instances (?) and a cube with dimensions of 200x200x10.
                            Could not choke it though, here is a quick screen capture with both image samplers
                            https://drive.google.com/file/d/1IGj...ew?usp=sharing
                            Attached Files

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                            • #29
                              There is something wrong for sure, as I had the same experience. Not only once. I will do some tests, too. Will try to reproduce the issue.
                              Would be great to find the reason..

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                              • #30
                                Originally posted by YunalZobu View Post
                                I hope I replicated the scene setup, cloner with 100x100x10 render instances (?) and a cube with dimensions of 200x200x10.
                                Could not choke it though, here is a quick screen capture with both image samplers
                                https://drive.google.com/file/d/1IGj...ew?usp=sharing
                                You have it set to Render Instances.

                                From my experiments over the weekend. I've reported an issue with Render Instances.

                                My post is in the C4D V-Ray issues.

                                Render instances appear to have some form of a bug. Multi-instance is the way to go. Even regular Instance is faster than Render Instance.

                                Worst possible setup is
                                1) Cloner with Render instance
                                2) Any material assigned to the Cloner tag vs object it self
                                3) Material Tag with Tile option unchecked.

                                You don't even have to get to thousands of clones, to experience complete halt in rendering.

                                If your V-Ray scenes are slow, check those Cloners. Make sure you avoid all of the items above. Otherwise you're in for the wheel of death experience.

                                I've tried your setup with multi-instance, and it renders immediately. When I set it to Render Instance, my C4D froze up.



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