Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] General Discussion => Topic started by: darrentomkins on 2016-03-20, 17:12:30

Title: Render Cpu percentage
Post by: darrentomkins on 2016-03-20, 17:12:30

Hi Hi,

I usually open my task manager and watch the Cpu percentage hit 100% and then stay there during a render but something has changed. I now see my RAM go up while its parsing but then the Cpu hit 100% on handover but after a few passes it sinks to around 7% - 9%. It used to sit at a constant 100% and the renders are MUUUCH slower.

Any Ideas out there?

Title: Re: Render Cpu percentage
Post by: FrostKiwi on 2016-03-20, 19:28:16

Also 100% disk usage ;]

You sure you turned off bitmap paging? Thats a classic tell tale sign of it.
https://coronarenderer.freshdesk.com/support/solutions/articles/5000675862-you-have-3ds-max-bitmap-paging-enabled-this-is-known-to-drastically-reduce-performance-of-textures-w

Title: Re: Render Cpu percentage
Post by: darrentomkins on 2016-03-20, 19:38:11

Strange thing is if I hide my plants layers then it renders at 100%?

Title: Re: Render Cpu percentage
Post by: darrentomkins on 2016-03-20, 19:44:43

Paging is disabled though. Got super excited thinking it was the answer :) Any other suggestions?

Title: Re: Render Cpu percentage
Post by: FrostKiwi on 2016-03-20, 21:39:05

Quote from: darrentomkins on 2016-03-20, 19:44:43

Paging is disabled though. Got super excited thinking it was the answer :) Any other suggestions?

Something is caching and reading from cache, that is obvious. Do you use a plugin? How did you scatter the vegetation?

disable windows page file for giggles, will work if OS issue, but wont if 3dsmax issue

Title: Re: Render Cpu percentage
Post by: Ondra on 2016-03-21, 10:21:38

Step 1: render with gray mtl override, see if it helps

Title: Re: Render Cpu percentage
Post by: darrentomkins on 2016-03-21, 11:16:53

I will check the OS cache story for sure but I agree, excellent idea to grey material render and rule out any textures first! I used Corona Scatter as well as Forest Pack and HD Plants / xFrog Plants.