Litesound Posted February 6, 2020 Share Posted February 6, 2020 (edited) Hello people! I'm currently trying to render pyro exoplosion with the motion blur in Redshift and I didn't succeed with any of my aproaches. I tried Convert to VDB , and then Merge Volume in Velocity mode with the motion blur ON but nothing works yet. I found few HIP examples but they neather don't work. Is there anybody who ever did this? Too bad there's nothing about it in the Redshift official documentation too. Please help Edited February 6, 2020 by Litesound Quote Link to comment Share on other sites More sharing options...
Howitzer99 Posted February 7, 2020 Share Posted February 7, 2020 It sounds like the only thing you're missing is to enable "Use Velocity Grids" in the Geo node. It will be under Redshift OBJ/Volume, then make sure that the naming matches your velocity volume, "vel" by default. Quote Link to comment Share on other sites More sharing options...
Litesound Posted February 7, 2020 Author Share Posted February 7, 2020 (edited) Thank you Howitzer99 Just tried enabling 'use velocity grids' option and somehow motion blur doesn't seem really correct, see the pictures below. Is that okey that blur behaves like that? It makes smoke puffy, not blurry Edited February 7, 2020 by Litesound Quote Link to comment Share on other sites More sharing options...
DaJuice Posted February 7, 2020 Share Posted February 7, 2020 This is a known issue with Redshift. As in, motion blur on volumes does something, but the results are not accurate. From what I understand the devs are working on updating the volume tech to add support for things like multi-scattering, so hopefully we'll see a fix for this as well. Quote Link to comment Share on other sites More sharing options...
Howitzer99 Posted February 8, 2020 Share Posted February 8, 2020 Maybe try adjusting the Velocity Grid Scale, it's an option below Use Velocity Grid in the screenshot above, and might be more accurate than frame duration. At least until, if it is a bug that the devs are aware, and a proper fix is in place. Quote Link to comment Share on other sites More sharing options...
Litesound Posted February 21, 2020 Author Share Posted February 21, 2020 Howitzer99 unfortunately Velocity Grid Scale does the same thing as a frame duration, the same fluffy result, which is dissapointing. So let's wait updation from devs:) Quote Link to comment Share on other sites More sharing options...
Howitzer99 Posted February 21, 2020 Share Posted February 21, 2020 What version of RS are you using? If you can you share a file, it would help to debug. Quote Link to comment Share on other sites More sharing options...
Jorge Medina Posted February 22, 2021 Share Posted February 22, 2021 Hi, the same problem here. I think it should be somthing to be with the velocity data transfered to teh engine. Dmitry, are you working in the the original world scale from houdini? Quote Link to comment Share on other sites More sharing options...
olivetty Posted April 14, 2021 Share Posted April 14, 2021 MB on volumes in RS just doesn't work at the moment. It tries to "smear"/"displace" the volume using the velocity data but it's not great to say the least. Maybe there's something you can do to the data and render out some kind of motion vector pass or something? I don't know Quote Link to comment Share on other sites More sharing options...
Deep Chahal Posted January 28, 2024 Share Posted January 28, 2024 I had this same issue, In order to solve this, make sure you are saving your cache is VDB not as bgeo, Enable Use velocity grid option and put vel in the velocity.x if your vel channel is merged. That's it; it will work. This is good forum about it https://help.maxon.net/r3d/houdini/en-us/#html/Volume+Object.html?TocPath=Volume%20Topics%7C_____1 Quote Link to comment Share on other sites More sharing options...
lazza79 Posted August 22, 2024 Share Posted August 22, 2024 On 1/28/2024 at 4:38 AM, Deep Chahal said: I had this same issue, In order to solve this, make sure you are saving your cache is VDB not as bgeo, Enable Use velocity grid option and put vel in the velocity.x if your vel channel is merged. That's it; it will work. This is good forum about it https://help.maxon.net/r3d/houdini/en-us/#html/Volume+Object.html?TocPath=Volume%20Topics%7C_____1 This works! Thanks a lot! I have noticed that if I use "Render as Delayed Loaded OpenVDB..." option, the motion blur does not work anymore. Any ideas? Best regards, Lazza79 Quote Link to comment Share on other sites More sharing options...
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