Corona_VS_Cycles

[raylight75]

I did some simple test with indoor scene with 3 planes with light material, angle in Blender is bit different but the light is nearly  same in  Cycles and Corona


The GPU rendering is still much faster over CPU.

[maru]

3... 2... 1... :D

[raylight75]

Yeah image uploading is a hard task

[Juraj]

No it isn't.

Even your example is far from fair. A single most eye-clashing variable is choice of hardware.

i7 950 is 5 years old middle-class CPU ( 350 euros when in arrived ) with passmark score of 5000. Modern high-end CPU of last year, 4930k costs 500 euros and would yield close to 15 000, 3times the performance.
GTX780 is last year almost top model (Ti would be equivalent of 4960X, both having only slight performance margin due to higher clock, but massive price increase), and you 2 of them.

If we would correlate this to your current scene, a fair comparison would be two 4930k (even though stacking 2-4GPU is of course easier).

This of course doesn't take into account many other variables, such as scene optimization, user's knowledge in setup,etc.

[raylight75]

No it isn't.

Even your example is far from fair. A single most eye-clashing variable is choice of hardware.

i7 950 is 5 years old middle-class CPU ( 350 euros when in arrived ) with passmark score of 5000. Modern high-end CPU of last year, 4930k costs 500 euros and would yield close to 15 000, 3times the performance.
GTX780 is last year almost top model (Ti would be equivalent of 4960X, both having only slight performance margin due to higher clock, but massive price increase), and you 2 of them.

If we would correlate this to your current scene, a fair comparison would be two 4930k (even though stacking 2-4GPU is of course easier).

This of course doesn't take into account many other variables, such as scene optimization, user's knowledge in setup,etc.

I doubt thath you  will go down below 60-90 seconds even with 4930K, and you need dual socket MB another 500ЕU, 2 780GTX cost 920ЕU your opinion 1500ЕU.

[racoonart]

Well, who cares anyways?
It's a simple scene with a simple task (imho a car rendering would be even better). GPU looks fast, cpu looks slow, even if you'd be using a modern cpu. Unless you're pushing the limits I don't see any need for cpu - gpu comparisons. If you do stuff like that, go with the gpu renderers, if you want to do massive texturing, use 3dsmax plugins or just don't want limited features caused by crappy cuda programming - go with cpu.
Simple as that.

[edit] just to make things more clear about cuda: Chaosgroup is recompiling their cuda gpu render code on-the-fly every time you start it to be able to keep things fast - "no hair? drop the hair code... no moblur? drop the moblur code" - so if you really need everything, e.g. a character with moblur and hair and sss and... it's as slow like wet bread.
Cuda doesn't even support recursion... madness!

[lacilaci]

if you wanted to compare cycles and corona, you should use cycles in cpu mode...

And on the performance gpu vs cpu.. How much wattage does that cpu draw off the wall and how much do those 2 gtx 780?

But yeah, if gpu rendering works for you and cycles works for you then it's fine...

[rambambulli]

if you like gpu render engines keep on using it.
Stop comparing if is doesn't improve or inspire in a better corona workflow/end result.
Otherwise it is starting to become a like a diesel - gasoline discussion, which one is the fastest.

[raylight75]

Wow I do not make comparisons just simple test with 2 pathtracing engines, so do not blame me ок..
DeadClown I know that for Chaos but the point of this thread was, do you have plans to make even with this problems GPU Support.

[racoonart]

Wow I do not make comparisons just simple test with 2 pathtracing engines, so do not blame me ок..
DeadClown I know that for Chaos but the point of this thread was, do you have plans to make even with this problems GPU Support.

Sorry, but these threads are predestined to get a little bitchy I guess, just don't take it personal ;)
As stated on the main page (www.corona-renderer.com FAQ, bottom) there is no intention to make corona using gpu(s).

[Juraj]

The GPU rendering is still much faster over CPU.

Well, you stated this conclusion, and that simply isn't true. Not in all conditions. A super fast scenario with unparalled hardware doesn't prove that.


Anyway, check this article to get realistic estimates for high quality production scene rendering using GPU-renderer iRay.

http://blog.irayrender.com/post/86984047311/from-2d-to-photoreal-making-of-by-delta-tracing

The final rendering production, is made by an 8 NVIDIA Tesla C2050 GPU system which renders a 5k image in about 3 hrs & 30 sec.

{Tesla C2050 is Fermi-architecture based equivalent of GTX480 in terms of raw processing power}

There is no magical solution on market that will give your high-quality photorealistic interior in high-resolution a few minutes rendering times. All the professionals are rendering stills in matter of hours.
I've been using Octane since alpha, one of the fastest unbiased GPU rendering engines on market (much more evolved than Cycles) and it is not...anyhow faster in actual production that CPU counterparts.

Unless we're talking rotating cars. Then it's 7 million times magically faster.

[Ludvik Koutny]

He could simply switch secondary GI in Corona and Cycles to cach...   oh, wait! :D

[Ondra]

just... wow.

Suddenly something smells like hairy spheres in here ;)

[raylight75]

just... wow.

Suddenly something smells like furry balls in here ;)

Yes Brecht van Lommel did good job for Cycles and he now will  be working for Solid Angle( Arnold)
Anyway Corona is a very good render for now еspecially by a team of two people, if you add support for  smokes, layered shaders, hair and other things will see.
And don't be ironic i will be you future client:))

[Ondra]

He obviously knows his stuff, I would put cycles into TOP5 end-user renderers right now. But that still does not make this particular comparison fair. I understand this is the hardware you have, but you cannot just make sweeping generalizations like that. Especially in places filled with fanboys ;)

BTW: we are 3 now. Just today I started to initiate Jarda into the core code ;)