Mental Ray to Corona

[aaouviz]

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...

[TomG]

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

[aaouviz]

Hmm, thanks!

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

[TomG]

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.

[Frood]

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

[aaouviz]

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?

[Frood]

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

[aaouviz]

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.

[maru]

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.

[aaouviz]

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

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

Thanks again mate, ughhh