Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] Bug Reporting => [Max] Resolved Bugs => Topic started by: cecofuli on 2015-02-02, 15:23:00

Title: SIMEPL SCENE: huge difference in Rays/s between IR and Production
Post by: cecofuli on 2015-02-02, 15:23:00

As in the title, with this simple scene:

Plane, glass, sun+sky (default settings):

PT+PT: 9.800.000
IR:  7.200.000  (# threads override =0)

Maybe is it for this problem?

https://forum.corona-renderer.com/index.php/topic,4751.msg44494.html#msg44494

Title: Re: SIMEPL SCENE: huge difference in Rays/s between IR and Production
Post by: maru on 2015-02-02, 15:47:30

As far as I remember IR uses only one core (half cores? all cores -1?) but let's wait for Keymaster.

Title: Re: SIMEPL SCENE: huge difference in Rays/s between IR and Production
Post by: cecofuli on 2015-02-02, 15:57:56

You can set IR to use all cores (# threads override =0), all cores -1 (# threads override =-1),  all cores -2 (# threads override =-2) etc...

Title: Re: SIMEPL SCENE: huge difference in Rays/s between IR and Production
Post by: Ondra on 2015-02-02, 21:51:39

interactive by default uses 4 PT samples instead of 16. if you set PT samples to 4, you will get the same slowdown even in regular rendering.

The scene is simply too simple to be representative, in such extreme case, writing to framebuffer will be the main source of overhead. with PT16, there is less writing, so greater speed.

Title: Re: SIMEPL SCENE: huge difference in Rays/s between IR and Production
Post by: cecofuli on 2015-02-02, 21:56:16

Ok, now I understand! Usually, for testing and debug, I try to use as simple scene as I can =)