Luxcore vs Cycles Final/Viewport

Use this forum for general user support and related questions.
User avatar
Dade
Developer
Posts: 4683
Joined: Mon Dec 04, 2017 8:36 pm
Location: Italy

Re: Luxcore vs Cycles Final/Viewport

Post by Dade » Mon Dec 09, 2019 4:00 pm

Sharlybg wrote:
Mon Dec 09, 2019 3:57 pm
The problem i'm mentioning is very obvious. please just open the file switch to viewport render and just change render engine from luxcore to cycles and back.
See the speed in convergence.
As written above: posting.php?mode=quote&f=4&p=18452#pr18444
RTPATHCPU is used for view port rendering while PATHCPU is used for final renders. They are 2 different render engines, the first is optimized for fast editing, the second for rendering.
Support LuxCoreRender project with salts and bounties

User avatar
Sharlybg
Donor
Posts: 2286
Joined: Mon Dec 04, 2017 10:11 pm
Location: Ivory Coast

Re: Luxcore vs Cycles Final/Viewport

Post by Sharlybg » Mon Dec 09, 2019 4:23 pm

I know that viewport engine is RTPATHCPU. So what i mean is that you can easily see that :


1/___Our viewport engine is much slower than Cycles viewport engine

2/___ running for longer with F12 engine show the same speed issue : 10X time render test.


Lux
Luxc.jpg

Cycles
Cycl.jpg
Support LuxCoreRender project with salts and bounties

Portfolio : https://www.behance.net/DRAVIA

User avatar
Sharlybg
Donor
Posts: 2286
Joined: Mon Dec 04, 2017 10:11 pm
Location: Ivory Coast

Re: Luxcore vs Cycles Final/Viewport

Post by Sharlybg » Mon Dec 09, 2019 5:09 pm

Another test No caching. just an area light. Max bounce = 4 for both. look how strong lux shadow are while cycles look more softer. Not saying that cycles look better just wondering if this have to do with some kind of trick under the hood ?


Luxcore
Lux__K.jpg


Cycles
Cycl__K.jpg


File
Lux__vs__Cycles__K.blend
(624.47 KiB) Downloaded 30 times
Support LuxCoreRender project with salts and bounties

Portfolio : https://www.behance.net/DRAVIA

User avatar
Sharlybg
Donor
Posts: 2286
Joined: Mon Dec 04, 2017 10:11 pm
Location: Ivory Coast

Re: Luxcore vs Cycles Final/Viewport

Post by Sharlybg » Mon Dec 09, 2019 5:54 pm

Just doing more test and look like Luxcore convergence can be really affected by poor adaptive settings :

Both are luxcore see how they clearly match cycles convergence quality :

Default
Lux__K+adaptive__Dflt.jpg


Customized
Lux__K+adaptive.jpg

Cycles
Cycl__K.jpg
Support LuxCoreRender project with salts and bounties

Portfolio : https://www.behance.net/DRAVIA

User avatar
Sharlybg
Donor
Posts: 2286
Joined: Mon Dec 04, 2017 10:11 pm
Location: Ivory Coast

Re: Luxcore vs Cycles Final/Viewport

Post by Sharlybg » Mon Dec 09, 2019 6:04 pm

Just applied the same knowledge of adaptive on the porsche scene. small improvement but Cycles is miles ahead. like we miss something in open 3D space.

same time/CPU

Lux
911Lux.jpg

Cycles
911Cycl.jpg
Support LuxCoreRender project with salts and bounties

Portfolio : https://www.behance.net/DRAVIA

User avatar
Sharlybg
Donor
Posts: 2286
Joined: Mon Dec 04, 2017 10:11 pm
Location: Ivory Coast

Re: Luxcore vs Cycles Final/Viewport

Post by Sharlybg » Fri Dec 20, 2019 7:26 pm

https://forum.appleseedhq.net/t/conveyo ... leseed/665

This open space performance issue seem to be real problem. A comparison between applesseed and luxcore show some already seen pattern.

Luxcore 3h vs applesseed 30mn.
Will be nice if Dez help us look into the file.
Support LuxCoreRender project with salts and bounties

Portfolio : https://www.behance.net/DRAVIA

Fox
Posts: 437
Joined: Sat Mar 31, 2018 11:17 am

Re: Luxcore vs Cycles Final/Viewport

Post by Fox » Sat Dec 21, 2019 4:41 pm

10 min with different russian roulette settings, top is extreme rr and bottom has rr off.
Russian Roulette.png

User avatar
Sharlybg
Donor
Posts: 2286
Joined: Mon Dec 04, 2017 10:11 pm
Location: Ivory Coast

Re: Luxcore vs Cycles Final/Viewport

Post by Sharlybg » Sat Dec 21, 2019 6:15 pm

Thanks for your input Fox. Dade also mention RR above (page 1).
Dade wrote:
Mon Dec 09, 2019 3:35 pm
Sharlybg wrote:
Mon Dec 09, 2019 3:23 pm
Note that shader are the same.
Does Cycles have Russian Roulette ?

Anyway, an analysis must start from simple cases: use a point light and use direct light only (and don't run the test for only 7 seconds or even a microscopic difference in export/start up time can make a huge difference in only 7 seconds).
Russian roulette isn't exposed in blendluxcore i think. Also if it is the key feature affecting rendertime like that can we make this feature adaptative ?
Support LuxCoreRender project with salts and bounties

Portfolio : https://www.behance.net/DRAVIA

User avatar
Sharlybg
Donor
Posts: 2286
Joined: Mon Dec 04, 2017 10:11 pm
Location: Ivory Coast

Re: Luxcore vs Cycles Final/Viewport

Post by Sharlybg » Sat Dec 21, 2019 6:30 pm

Look like it what path guiding is made for :
https://www.google.com/url?sa=t&source= ... f5RjPvykdZ
Support LuxCoreRender project with salts and bounties

Portfolio : https://www.behance.net/DRAVIA

Fox
Posts: 437
Joined: Sat Mar 31, 2018 11:17 am

Re: Luxcore vs Cycles Final/Viewport

Post by Fox » Sat Dec 21, 2019 6:35 pm

The rr is little biased, but it's not strongly visible in other scenes than heavy complex light paths. For an example my camera scene with solid glass lenses, the aperture blades were behind 5'th lens and they became invisible with extreme rr.

Post Reply