Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: aaouviz on 2021-11-09, 14:37:31

Title: Mental Ray to Corona
Post by: aaouviz on 2021-11-09, 14:37:31

Hi, just checking if material converter for Mental Ray -> Corona works?

I got a scene, converted it, but it failed big time. Perhaps I'm missing Mental Ray plug-in (I'm using max 2021)?

Thanks for any advice...

Title: Re: Mental Ray to Corona
Post by: TomG on 2021-11-09, 15:20:40

You are indeed missing Mental Ray, it was removed from Max a few versions ago.

Title: Re: Mental Ray to Corona
Post by: aaouviz on 2021-11-09, 15:25:56

Hmm, thanks!

And is there a way to get it back for 2021, do you know?

Title: Re: Mental Ray to Corona
Post by: TomG on 2021-11-09, 15:35:29

https://knowledge.autodesk.com/support/3ds-max/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-download-Nvidia-s-mental-ray-and-IRay-renderers-for-3ds-Max-2018-and-Maya-2018.html

TLDR, no way to do it.

Title: Re: Mental Ray to Corona
Post by: Frood on 2021-11-09, 15:40:54

Nah, it's easier: The 2020 plugins work for 2021 as well so that converters can access at least all materials. Just copy over <MaxDir>\Plugins\Nvidia\* from a 2020 installation to Max2021 and then open scene and convert to Corona - done.

Edit: Hmm the converter does not convert the Arch&Design materials. I could have sweared this has been my setup to convert mr objects. I can see the material, but the converter does nothing - have to investigate.

Edit: No idea why it is not working (any more?) here. I can access the materials, but the Corona converters (old 1.45 one and current) do nothing. Using Max2020, converting works.


Good Luck

Title: Re: Mental Ray to Corona
Post by: aaouviz on 2021-11-10, 10:54:20

Hmmm... bummer!

Thanks for the research guys, much appreciated.

So my best option is to install max 2019(?) and open the asset there, convert it to Corona and then migrate it back?

Title: Re: Mental Ray to Corona
Post by: Frood on 2021-11-10, 11:36:09

Hi aaouviz,

if it is no issue for you to install 2019 then maybe yes. Meanwhile I recalled how it worked using Max 2021 though:

- use the Max 2020 plugins as described previously
- type "Arch___Design__mi=Arch___Design" into maxscript listener
- launch Converter 1.45

Those different material class names in 2020 and Max 2021 (despite using the same plugins) were the reason why the Converters did not convert anything. I modded the 1.45 Converter to convert "Arch___Design" just like "..._mi" (it's just adding/changing 2 lines) but I found out that it works as well if issuing that command above in the max script listener before starting the converter. So it's up to you :) But make sure you use the "old" converter 1.45 - the current one still for example creates transparent materials if refraction=1 and refraction color=black. And old mr assets tend to be setup like this.


Good Luck

Title: Re: Mental Ray to Corona
Post by: aaouviz on 2021-11-17, 11:02:59

Quote from: aref3dsmax on 2021-11-14, 19:36:54

Hi. my friend Mohamad reza mohseni solve this

just run script and finish

Thanks mate.

I hope you don't get offended... but I'm just being a bit cautious.

The zip contains a *.exe not a script... so I'm curious how exactly it works? Obviously i'm hoping to convert mental ray to corona... but I don't see how this happens outside of max.

Title: Re: Mental Ray to Corona
Post by: maru on 2021-11-17, 11:47:40

The file attached in the removed message in this thread was marked as malicious by various antivirus software. If you have downloaded it, please DO NOT run it.

Title: Re: Mental Ray to Corona
Post by: aaouviz on 2021-11-17, 14:14:42

Thanks! I'm glad I was suspicious...

I downloaded it, but didn't open it. Close call.

Thanks again mate, ughhh