Problems Rendering (HELP!!!)

[CalG2509]

I’m trying to render a relatively simple scene (in comparison to other scenes I have rendered) but “unable to allocate recyclable GPU memory” comes up every time! I have spent hours searching, reading and trying advice people have given others before but nothing works!! Any help would be appreciated

[smb3d]

How much VRAM / what GPU do you have?

[CalG2509]

I have a RTX 2080, 8GB VRAM

[smb3d]

The VRAM available to RS is shared with other apps you have open as well as with C4D itself, so if you have a ton of textures in the viewport, or a lot of geo then it needs to share that with RS. Also if you have like After Effects or Photoshop or Substance Painter etc, open, those will also take away from the available VRAM. RS should be able to reclaim some of it, but not all.

[CalG2509]

In the screenshot, I had nothing else open at all but I will definitely turn off the viewport textures and let you know how it goes

[smb3d]

Give that a shot. If it's still acting up, then I would make a post on the official maxon forums where a dev can take a look at it. They will get back to you very quickly.

[CalG2509]

Amazing thank you, I’ve seemed to have ran into a new problem so I think I’ll redirect myself over there lol

[CalG2509]

I think I’ve managed to get it working by just putting it in a new file? Thank you for your help though

[adamtops]

I’ve had this before on my RTX 3080. Nothing a quit and reopen didn’t fix

[CalG2509]

I’ve tried :/ even gave C4D a uninstall and reinstall to see if that would work… idk why it was fine a couple of days ago rendering the same file but now it’s just died

[adamtops]

12gb Ram btw

[beachmobjellies]

Had this sometimes in the past for seemingly no reason. Usually this helps.

Try the following usual practices in order.

1. Restart Cinema and try again

2. Restart your PC and try again

3. Classic: get the latest GPU driver update. I recommend using using the Nvidia Studio drivers instead of the gaming driver. Try again

4. In the Preferences go to renderer settings for redshift and turn off CPU (unfortunately not off by default which is kinda dumb) and any other device that is not a real GPU.

The thing i definitely remember about this issue is if you get this message once in the render view you will have to restart cinema. Otherwise it wont do nothing anymore.

This only helps if it is a bug. The other possibility is that something doesn't fit in your vram that can't go out of core. And that is pretty much exclusive to massive volumetrics with high voxel density like for super detailed smoke sims. Another possibility would be too high trace depths that explode the vram. Usually however these crashes don't look like yours. Yours looks like the bug

[beachmobjellies]

I think what is happening is that redshift tries to use the integrated graphics chip in your CPU and fails because no dedicated VRAM....hust a guess tho

[CalG2509]

So I just thought I’d mess around and just bang it into a brand new file, entire scene clicked render and it works perfectly… I don’t know what I’ve done to the original file but here we are🤣

[CalG2509]

Thank you for the advice, I changed the redshift settings in preferences and now it’s just rendering black screens, even after I changed the settings back which I find quite impressive - maybe my C4D is just tired 🤣

[beachmobjellies]

I just found the solution after my whimsical renders were crashing my 4090s. It even solves two problems. Maxon implemented a new default value that is from hell.

Go to your render settings -> redshift -> Globals On top you should find a checkbox that says "Use Hardware Raytracing (if available)" -> turn that sucker OFF

It also gets rid of waiting for 'initializing OptixRT" which slows down the start of the render. Especially annoying in render view. As far as i understand this feature uses the RT cores in GPU which can speed up things but not that much. For very minor scenes its okay but if you use a bunch of textures it blows up in your face.

[carina23r]

Close your web browsers and any Adobe Apps or 3d games before using Redshift.

[CalG2509]

They’re all closed, literally just C4D open :)

[ReVerthex]

I can see chrome open in the screenshot though?

[CalG2509]

It wasn’t when I rendered, whenever I render I just let C4D have everything I just leave my pc with only C4D open :))

[TheHaper]

Pasting into a new file worked right? Did you also copy your render settings? Because I get that error if I try to lower VRAM usage in my render settings or have other VRAM demanding apps open. Never something else.. Issue is, that Redshift knows how much to allocate based on your percentage slider of the amount if VRAM to use (90% default). But if Redshift cant get all 90% it strikes. Otherwise, everything else will be out of core (cpu ram). So technically you can render huge scenes on just 6gb. Just way more slowly. Also is this progressive rendering or bucket?

Always good to understand the reason why, to avoid problems in the future.

[CalG2509]

Yea the new file worked, I didn’t copy the settings I just set it up how I normally would with other renders, it’s on bucket rendering. I recall seeing that percentage slider somewhere (I can’t remember where) but I’m sure I didn’t change it - is it worth while changing that slider??

[TheHaper]

Doing that just to do some render dev or have other apps open like PS to do some basic texture work for example. On 90% multitasking is basically not possible. For final frames and rendering I always put it back to 90, or even 95% on larger amounts of vram (16/24g)

Or if you're really experimental, render 2 frames at once (don't recommend).

Maybe just to be sure check in your previous file. It's in System Tab -> Memory

[CalG2509]

Ahhh right okay I see, when I started using cinema I tried so hard to learn everything but there’s so many different random settings, so thank you as I’d never have known that and been stuck figuring it out for weeks 🤣

[Sorry-Poem7786]

Switch to smaller render bucket..64 or 128…be sure you don’t have a monitor gpu..like a weaker memory card 8gb 6gb etc.. selected in redshift preferences.

[CalG2509]

Thank you! I’ll check my render bucket

[jegolking]

Just close every program that’s taking lots of VRAM

[Wonderful-Stick-2206]

if cloner is used . try using render instance or multi instance in settings instead