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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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How to Disable Material Preview C4D Arnold?

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Message 1 of 5
cody_zox1
947 Views, 4 Replies

How to Disable Material Preview C4D Arnold?

IS there a way to disable buggy material preview generator - those little balls, cause it totally made my PC freezing and all kind of nasty stuff. Im working at the moment on a project with 8K textures, at first i tought something is wrong with my PC, i even reinstalled one whole day windows and all apps on it, cause of this problem. Finallt realized what it is al about. Cant beleave that a company like Autodesk can create such a miss with this and havent put an option to disable it. Now i finally got the insane message on the start of rendering sometimes: "another render is happening, wait that its finished". Coudnt realize what the hack, tought its a bug, than finally goit it, computer slowes down on every minor change in material editor and "renders" preview. Be the best render out existing and personal preference, cant beleave the team behind it let something like this happening.

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Message 2 of 5

Sorry that this was causing you so much trouble.

You can disable previews via the Render Preview checkbox on the Arnold Material (below the Open Network Editor button).

What's your C4DtoA version? There was a recent fix in 3.1.0 about material previews blocking the UI. It's still not working perfectly, because unfortunately if you do any change in the scene, Cinema 4D interrupts and restarts the preview render. Also using Tx textures may speed up loading.

There's also a limitation right now in Arnold, which does not allow multiple renders running in the same process. That's why previews are not rendering when the IPR or a background render is running. It's on our roadmap to get rid of this limitation, but it's a complex problem.

Message 3 of 5
cody_zox1
in reply to: cody_zox1

My apologize, its the situation "havent seen tree log in the woods". I turned everything upside down to find it. Im using 3.0.1.1, GPU all the time. Found it the most stable somehow on my machine and current work. Yeah i use TX textures allways. After first starting on IPR, Arnold automatically generates TX copy in default TEX folder. After that i always go to material editor and replace original texture with TX one - maybe im wrong, but i have feeling its less on the hardware than and works faster. Even before final rendering, guess thats because they take less memory and are optimized for Arnold. I recommand that to anyone. Correct me if im wrong. I dont have trouble about multiple renders, im aware of it, most of the renders are like that, at least a few i tried, they dont mix IPR with final rendering, except You have hardware devided for each purpose. So is it possible to have active IPR with with final rendering in the background using some strong multicore CPU like threadripper? I have some question about that too, now im in the diff situation. Im planning to upgrade my PC specially for Arnold and mostly C4D. If i go to CPU option, i must buy some expensive PC based on threadripper, which is great, stable, using amount of memory depending on RAM machine have etc. Very good and trouble free. On the other hand, new graphics RTX 3090 for example, just kills it with speed, specialy in IPR refreshing, which is very very important to me, but sadly, GPU Arnold does not have stability and complete quailty of final result of CPU Arnold. The biggiest problem with GPU Arnold and bottleneck so to say, is memory ammount. I currently have 1070GTX 8Gb video ram, which become tiny pool for my work. As i understand, video RAM of graphic card used is memory which GPU Arnold gonna use for the scene. No matter how much RAM in the computer i have, be that 64Gb for example, im limited to that VRAM of graphics card for the scene. THats big problem with Arnold GPU. Means i can target only card like 3090RTX than having 24Gb VRAM, which is something modestly decent, barely still enough for some serious work with 8K and above textures and much polys with complex scenes and lightning. WHat is Your recomandation? THx for answer in advance!

Message 4 of 5

> So is it possible to have active IPR with with final rendering in the background using some strong multicore CPU like threadripper?

Not yet. Being able to run multiple render session in parallel is on our roadmap, but I can not give you any ETA at the moment.

Message 5 of 5

Yes, on GPU you are limited to the VRAM. We're planning some major improvements in the next releases regarding GPU memory usage. If you can, I'd recommend to wait a bit and try it out once available to see how it performs regarding your needs.

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