Recent Posts
1
Forest Pro (*) / Re: Seemingly random blurry patches - Vray GPU
« Last post by Michal Karmazín on Today at 08:43:12 am »Hi,
I'm sorry to hear you're encountering these issues. To be honest, I'm not sure why Chaos Group referred you to us—when it comes to GPU rendering, support for our plug-in is fully handled by Chaos Group. That said, we’ll do our best to help from our side. Would you mind running a quick test using Forest Tools to export all distributed items as instances before rendering? You can find this option under Utilities > More... > Forest Tools. For more information, please refer to our online reference guide. This test will help determine whether the issue occurs during the conversion of the Forest object.
Thanks in advance for any additional details you can provide.
Best regards,
I'm sorry to hear you're encountering these issues. To be honest, I'm not sure why Chaos Group referred you to us—when it comes to GPU rendering, support for our plug-in is fully handled by Chaos Group. That said, we’ll do our best to help from our side. Would you mind running a quick test using Forest Tools to export all distributed items as instances before rendering? You can find this option under Utilities > More... > Forest Tools. For more information, please refer to our online reference guide. This test will help determine whether the issue occurs during the conversion of the Forest object.
Thanks in advance for any additional details you can provide.
Best regards,
2
Forest Pro (*) / Seemingly random blurry patches - Vray GPU
« Last post by TeeKay on July 09, 2025, 06:36:19 pm »This started happening on every single render I did upon updating to the latest version of Vray at the beginning of this year. After reverting back to a 2024 build, it pretty much stopped happening. But lately it's popping up in my renders every once in a while (though not nearly as often or widespread as when I updated to the 2025 build).
Basically, with grasses and wood chips, I get these random, very ugly blurry/smudgy patches in my scatters. Has anyone else seen this? If it's been brought up before I apparently didn't know the correct keywords to look for as I found nothing.
Attached examples 00, 01, and 01B: Recent renders with much smaller patches of blurred surface
Attached example 02: Render from early in the year when updating Vray to 2025 build. Blurry patches are FAR more widespread but similar in characteristics.
Reddish Magenta outlines: Blurry areas
Green outlines: Desired look
Orange outlines: Odd lack of denoising, causing "fireflies" from 2025 build renders
I suspect it has something to do with the denoising pass? As you can see in 01B (bottom left is origRGB pass and top right is denoiser pass), the origRGB image comes out with the suspected fireflies but the woodchips are detailed; the denoiser pass is when everything gets hosed.
Any help is greatly appreciated since:
the denoiser pass is a required aspect to GPU rendering,
Chaos says talk to itoo,
reverting to CPU is just straight not an option with the monetary and time investment I've made in model conversions, model purchases, and hardware/software purchases; not to mention the exponentially longer render times.
Basically, with grasses and wood chips, I get these random, very ugly blurry/smudgy patches in my scatters. Has anyone else seen this? If it's been brought up before I apparently didn't know the correct keywords to look for as I found nothing.
Attached examples 00, 01, and 01B: Recent renders with much smaller patches of blurred surface
Attached example 02: Render from early in the year when updating Vray to 2025 build. Blurry patches are FAR more widespread but similar in characteristics.
Reddish Magenta outlines: Blurry areas
Green outlines: Desired look
Orange outlines: Odd lack of denoising, causing "fireflies" from 2025 build renders
I suspect it has something to do with the denoising pass? As you can see in 01B (bottom left is origRGB pass and top right is denoiser pass), the origRGB image comes out with the suspected fireflies but the woodchips are detailed; the denoiser pass is when everything gets hosed.
Any help is greatly appreciated since:
the denoiser pass is a required aspect to GPU rendering,
Chaos says talk to itoo,
reverting to CPU is just straight not an option with the monetary and time investment I've made in model conversions, model purchases, and hardware/software purchases; not to mention the exponentially longer render times.
3
RailClone Pro (*) / Re: Curb with pavement corner problem
« Last post by NHimages on July 09, 2025, 02:07:58 pm »Thank you for the answer.
Yeah this version is definitely better, even if there is still some little problem the major issue as been solve.
Have a nice day !
Guillaume
Yeah this version is definitely better, even if there is still some little problem the major issue as been solve.
Have a nice day !
Guillaume
4
RailClone Pro (*) / Re: Curb with pavement corner problem
« Last post by Michal Karmazín on July 09, 2025, 01:26:47 pm »Using the Corner input with the Bevel Corner option enabled should help avoid these issues. Additionally, slightly shortening the segments using the Transform Operator can improve the result. I've attached a revised version of the scene. I hope this helps.
Best regards,
Best regards,
5
RailClone Pro (*) / Re: combining sequence and random segments
« Last post by tzaar on July 09, 2025, 11:46:01 am »Ok that's brilliant! I was a bit tired and though "segment" refered to segment as in the sub-object on a spline. But of course "Segment X" is the number of segments railclone has created on that spline 
6
RailClone Pro (*) / Re: Curb with pavement corner problem
« Last post by NHimages on July 09, 2025, 11:42:49 am »Hi,
Thx for your answer, it seems to be working better with the Y offset yes !
I was wondering if there is a way to now fix the "wrong slicing" effect on the corner of the pavement ?
I've done some test of default mode (attachment) :
- TILE made a fill effect with little square wich is not what we'r looking for
- SCALE is what I'm looking for but it strech the geometry too much and we don't have the effect of random anymore
- ADAPTIVE is also better but there is too much of deformation betwteen pavement stones
I don't really know what is the best option to achive the scale effect with the adaptive one !
Thx for your answer, it seems to be working better with the Y offset yes !
I was wondering if there is a way to now fix the "wrong slicing" effect on the corner of the pavement ?
I've done some test of default mode (attachment) :
- TILE made a fill effect with little square wich is not what we'r looking for
- SCALE is what I'm looking for but it strech the geometry too much and we don't have the effect of random anymore
- ADAPTIVE is also better but there is too much of deformation betwteen pavement stones
I don't really know what is the best option to achive the scale effect with the adaptive one !
7
RailClone Pro (*) / Re: Curb with pavement corner problem
« Last post by Michal Karmazín on July 09, 2025, 11:13:12 am »Hi,
In this case, it’s recommended to adjust the Y Offset value instead of using Transform > Y Fixed Translation for the Segments. Please find attached a modified version of your scene demonstrating this setup. I hope you find it helpful.
Best regards,
In this case, it’s recommended to adjust the Y Offset value instead of using Transform > Y Fixed Translation for the Segments. Please find attached a modified version of your scene demonstrating this setup. I hope you find it helpful.
Best regards,
8
RailClone Pro (*) / Re: combining sequence and random segments
« Last post by Michal Karmazín on July 09, 2025, 10:42:34 am »You're welcome. You can use the Segment > X Counter rule of the Conditional Operator to match the number of items placed by the Sequence Operator before the Randomize Operator takes over. In this case, set the condition to Less than 8. Please find attached a revised version of your scene demonstrating this setup.
Best regards,
Best regards,
9
RailClone Pro (*) / Curb with pavement corner problem
« Last post by NHimages on July 09, 2025, 10:33:10 am »Hello,
We currently have a problem with our RC preset of a curb with pavement distribution on the inner curb, the first line of pavement seem to be ok, but when we had the second and the third it went wrong.
This happens in the corner of the preset, the pavement does not slice correctly and we have bad result with rectangular shape while with circular one the preset seems to work properly (see attachment).
Is there a way to fix the issue on the corner with a rectangular shape ? We already tried all modes of distribution in the default rollout but it did not work.
I attached the scene if you can have a look !
Thank you,
Guillaume
We currently have a problem with our RC preset of a curb with pavement distribution on the inner curb, the first line of pavement seem to be ok, but when we had the second and the third it went wrong.
This happens in the corner of the preset, the pavement does not slice correctly and we have bad result with rectangular shape while with circular one the preset seems to work properly (see attachment).
Is there a way to fix the issue on the corner with a rectangular shape ? We already tried all modes of distribution in the default rollout but it did not work.
I attached the scene if you can have a look !
Thank you,
Guillaume
10
RailClone Pro (*) / Re: combining sequence and random segments
« Last post by tzaar on July 09, 2025, 10:18:50 am »Evently is what I want. I though I'd have to do with default and a padding because I couldn't get it (sequence->random) working. Not sure what your conditional was doing really? It switches when it's on a specifik segment number?
But I've now landed in a final setup that looks like this. It has a manual part of it where one has to tweak the percentage along spline of the conditional to decide wether it uses the sequence or the random. That's fine in my case now. Thought there was a sneaky way of doing it completely automatically. There might be? If one can check how many segments there are in the sequence and then in the conditional (or some other math or scripting node thing that I haven't mastered) check for that amount and then switch to random.
Cheers and thanks for the help!
But I've now landed in a final setup that looks like this. It has a manual part of it where one has to tweak the percentage along spline of the conditional to decide wether it uses the sequence or the random. That's fine in my case now. Thought there was a sneaky way of doing it completely automatically. There might be? If one can check how many segments there are in the sequence and then in the conditional (or some other math or scripting node thing that I haven't mastered) check for that amount and then switch to random.
Cheers and thanks for the help!
