render engines splash

Render engine comparison and why I chose Thea for the moment.

This article is my personal opinion, this question comes up a lot, so I’m going to try break it down here. This article is for people without any allegiances. I will attempt to break down why i made the choice that i made and depending on your situation which render engine would be good for your needs.


Vray – the grand daddy of 3rd party render engines for c4d.

  • Big user base. Like REAL big
  • lots of material presets
  • many/most features of c4d supported


  • too many settings ( this is promised to be fixed in next release)
  • no gpu support, so not as speedy as others (also should be fixed next release

Arnold – The new big gun.

  • Can handle astronomical sizes of scenes without problems
  • Supports lots of features straight off, including hair, xparticles, openvdb volumes from houdini.. etc..
  • if you are planning on working in production houses this is the way to go.


  • aquired by autodesk…  ( chance of being discontinued development for other applications)
  • you’re really going to need a render farm for everything. its very slow to clean up noise.
  • also no render node licenses, but really only go for this render if you are relatively free with your budgets.

Octane – The first GPU render, with super fast growing popularity

  • lots of features supported. especially turbulenceFD
  • very large user base, and growing rapidly


  • otoy don’t sell render nodes, so you will never find farms that support it. they promised their own farm solution, but its not out yet. And even then there will be one farm, so if something happens to it, if its down, you have no alternatives.
  • only gpu render, so if you run out of memory on your video card, there is no work around, no fall back.
  • aggresive online activation system:  for example this quote from an online chat: “what’s with octane today, said i have to deactivate, and i did, said i had to wait 60 minutes, and i did, then i try again and says deactivate and i did, NOW 60 FUCKING MINUTES AGAIN!!!!!! AHHHHH I’m losing my shit”

[edit]: Octane just announced availability of new version: This may be a pretty big shift. If i find the time i’ll go experiment with it. I like a lot of the stuff they brought up there. eg. $10/month for up to 2 gpus. and then just pay for their render farm is an approach i kinda like. But still the aggressive licencing might prevent me from using it on jobs.. will experiment see how it goes. 

Thea render – First and only render engine to combine CPU and GPU.

  • uses all available cpu’s and gpu’s together. If GPU runs out of memory, can just keep rendering on CPU.
  • render nodes available. results in farms being available.
  • substance material converter.
  • material repository which is cross platform. so thea users that make materials for sketchup, max etc, can share those materials and they can be used in c4d.


  • relatively small userbase at the moment.
  • still behind octane in feature support, for example turbulenceFD, motionblur and some other small issues. ( read my thea review for more details)
  • doesn’t support xparticles colors like arnold does.
  • lacks node based material editor

Here are some more renders, that ive heard very little about, but i felt like i should mention them: Corona, some say its as fast as gpu renders, but on cpu. I tried, i disagree, but then again im using a 4790k, maybe on a 12 core its actually blazing fast. but so far, haven’t heard anything great about it. Indigo render, only seems to have an exporter. so its not a native implementation, also plugin doesn’t seem to have been updated since july 2015. Redshift in an biased GPU engine, that is rumoured to be heading for c4d. but hasn’t yet been released. Maxwell is basically Octane/thea but only on CPU, so it makes really pretty things, but its kinda slow. Im not sure what is market position is right now.


Biased vs unbiased

You might here these terms regarding render engines thrown around. In short. Unbiased render engines are brute force light calculations. Generally most unbiased render engines will have a very similar look and feel to them. So Octane, Thea, maxwell.. etc. While biased means that the render engines cheats in order to increase speed. so it throws more power at the areas with more details, and less at smooth surfaces, and then averages stuff. This is the reason you get splotchy renders and flickering in animations. Modern days biased render engines have ways of overcoming these shortcomings, with relatively little effort, but nonetheless, its still an issue sometimes.


So lets wrap this up

Once again, this is targeted at someone who is just looking at 3rd party renderers. And mostly this is my opinion and specific to my situation. If money for farms is no obstacle, i would probably recommend arnold. If you can afford it, as it stands right now arnold + cash = awesome. It supports the most c4d features can handle any scene you can throw at it and is used by top studios so it’ll probably help if you are intending to get employed. For me this is not the case. Im not looking to get full time employment or work for hollywood movie productions and i need more speed. If arnold introduces GPU i will re-evaluate my options.


Now on to Octane  i personally like choice, so im not going to lock myself into a company that doesn’t let me use 3rd party farms. Right now they do not have a farm service, they are building their own one, but still it will be just one farm. So if its down, you’re up a creek. Also it means you can’t build your own mini farm at home without paying for a full license for every computer you use. ( octane has no render node licenses). Also if your gpu runs out of memory, you have no choice, you can’t do anything about it. that’s it. either optimize your scene or re-do the render in another engine.


Vray  im actually very excited to see what the new vray4c4d can do. It sounds REALLY promising. but i need something now, and well it’s not avaible right now. The current version is not GPU accelerated, so its not really on my radar for that reason.


And well this brings me to Thea. It runs on both CPU and GPU, it comes with 2 render nodes. If your gpu runs out of memory you can just render on c4d ( albeit a bit slower).  Its crazy fast, recently hired c4d specific developers which have been doing an awesome job, the speed improvements have been phenomenal with every release. Has 3rd party render farm support. Since it uses both CPU and GPU, it can clean up noise really fast, as it uses the strengths of both architectures, GPU is good for cleaning up areas of uniform light due to its 100-1000’s of cores and cpu for cleaning up smaller details.  And to boot it’s cheaper than the competition. So if your projects don’t need turbulence fd or complex xparticle color control its a really solid option. more info in my review.

So there you have it. If you have any amendments you think i should make please do tell me, im only human and have only so many hours in a day to keep up with all this.


P.S. I am a beta tester of thea render, but i receive no compensation for writing this article.


17 replies
    • aleksey
      aleksey says:

      maxwell gave great results, but it was always very slow. maybe for stills its ok, but i don’t have that much time to wait for animations. With thea’s speed there is a a lot i don’t have to farm out, which is great.

      If you have any articles or videos you can point me to which talk about maxwell and its use in fast paced environments i’d love to have a look at it. but so far i don’t see it like that.

      what kind of flexibility are you talking about?


    • aleksey
      aleksey says:

      really? did not know that. But to be honest right now iray is not a contender on any level. The current beta for c4d is a prototype at best. and it take so long to clean up noise, i didn’t even get there. was waiting for like 3 minutes on a cube with a luminance plane.. and still noisy..

      maybe in a couple of updates it’ll be better, after all it does have nvidia’s budget behind it.. but for now.. meh..

  1. Chris
    Chris says:

    I’d like to see standard and Physical in there. And is it true that VRAY for C4D pretty behind from other versions? Great write-up otherwise.

    • aleksey
      aleksey says:

      standard super fast for simple scenes. physical faster when you have more detail, blurry reflections etc.. But this article is about 3rd party render engines. Maybe next time i can compare physical and standard. although i feel people like nick from GSG have covered this in their presentations.

      also due to the fact that since the new reflectance channel got introduced where i cant edit multiple reflectances at the same time, ive stopped using standard renderer for the most part.

  2. Ronaldinho
    Ronaldinho says:

    Great info Aleksey. Thank you for taking the time to put this together.

    A question regarding bias engines…are Octain, Thea, and Maxwell unbias and all the others biased?

    • aleksey
      aleksey says:

      Thea has both biased and unbiased engines in the package. Its actually 5 engines in one. but the GPU ones are unbiased. some biased engines have brute force mode ( its ussually much slower). Also im pretty sure arnold is unbiased. Corona offers unbiased rendering option. you should check out each render individually.

  3. Alan Farkas
    Alan Farkas says:

    Hi Alekey, just stumbled onto your site. Great stuff! Will continue to come back for info.

    Super important Q for me: VRAY FOR C4D – Do you know if that particular incarnation of Vray is going to be RT anytime soon, for GPU rendering? (and whether it’s going to be like Thea for both cpu/gpu?) They’re apparently some third-party company licensed out to make vray, so there’s no-one to call, and their info on the website is basically nil.

    Thanks so much!

    • aleksey
      aleksey says:

      Hey Alan, well from what i hear on the interwebs, the beta is out for people who purchased the vray master course or something. Im not sure if its hybrid gpu+cpu at the same time. I think it has a render engine with is gpu based and one which is cpu based. But its just my opinion. I might be wrong, it might be hybrid.

      the guy to get in contace with is named stefan, maybe you’ll have some luck through here: ,if you didn’t find the info on official site ( i know there are like 3). he also frequents c4dcafe so maybe try on there.

  4. Mark
    Mark says:

    Hey Aleksey,
    great write-up. I was a VrayforC4D user for 9 years & got totally fed up with tweaking settings etc to cut artefacts & render times, as well as the glacial pace of developments & sometimes confusing instructions (non-native English speaking)
    Swapped to Maxwell which I love (now with GPU in release 4!) but like you came around to also using Thea- awesome CPU/GPU
    acceleration, materials, animatable shaders/settings in C4D (can’t do that yet in Maxwell) great for getting high-quality Maxwell like animations done in reasonable time. Fast & responsive developers for C4D.
    ..avoided Octane & Arnold for similar reasons, & as I dislike the materials setup too.
    Would recommend Thea to anyone thinking about an alternative.


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