Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] General Discussion => Topic started by: John.McWaters on 2021-12-17, 17:28:07

Title: 4K Cache questions
Post by: John.McWaters on 2021-12-17, 17:28:07

Is it okay to use the 4K cache instead of UHD Cache for rendering? What are the benefits and drawbacks? I know it's still labeled as experimental, but has it seen enough development since the release of Corona 7 to be considered on par with UHD cache?

How does the 4K cache work that is different from UHD?

edit: I found this

The 4K cache uses only partial caching, so does not try to interpolate everything. While this is slower than a fully cached solution (such as irradiance caching), it does not create artifacts, only noise that eventually goes away.

The 4K cache is an ideal solution for animation, and significantly reduces flickering even when light sources or geometry are moving. This is especially important when the cache cannot be precomputed.

 

Title: Re: 4K Cache questions
Post by: maou42 on 2022-01-03, 07:19:28

Hi

One of the devs told me that one should use 4K cache because it is physically more accurate. However, it can lead to some problems in some specific settings and lead to black square artefacts in which case one should revert to UHD cache.

The artefacts are apparently very obvious and if one does not notice anything out of the ordinary, then it is all good...

Title: Re: 4K Cache questions
Post by: Ryuu on 2022-01-14, 07:52:41

This thing

Quote

The 4K cache uses only partial caching, so does not try to interpolate everything. While this is slower than a fully cached solution (such as irradiance caching), it does not create artifacts, only noise that eventually goes away.

is also true for the UHD cache, so no difference there.

Apart from occasional bugs already mentioned, there is also performance difference. UHD tends to be faster than 4K on low core count CPUs (e.g. 4-core i7s), while 4K cache tends to be faster than UHD on higher count CPUs (e.g. 16-core threadrippers).

Title: Re: 4K Cache questions
Post by: romullus on 2022-01-14, 10:10:36

Quote from: Ryuu on 2022-01-14, 07:52:41

Apart from occasional bugs already mentioned, there is also performance difference. UHD tends to be faster than 4K on low core count CPUs (e.g. 4-core i7s), while 4K cache tends to be faster than UHD on higher count CPUs (e.g. 16-core threadrippers).

That's useful information. Thank you!

Title: Re: 4K Cache questions
Post by: maou42 on 2022-01-22, 02:59:43

Thank you for your replies.