Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: vinidelimaa on 2020-10-05, 17:03:32

Title: type error getclassinstances requires maxclass got undefined
Post by: vinidelimaa on 2020-10-05, 17:03:32

I got this error "type error getclassinstances requires maxclass got undefined" always when I try converting an object inside Corona Converter.
It also occurs when I open some objetc or assets inside 3DS MAX 2021.

I just saw the Autodesk helper forum, but there they recommend to install the Vray, also if I'm using Corona Renderer.

Anyone knows the solution of this problem??

Thank you!

Title: Re: type error getclassinstances requires maxclass got undefined
Post by: maru on 2020-10-05, 17:23:27

That is correct - you need to install V-Ray to be able to convert V-Ray materials to Corona. Otherwise Corona doesn't know what to convert from.
If you are converting from some other renderer, you need to have that renderer installed.
It does not have to be activated though. Just the installation is enough.
See: https://coronarenderer.freshdesk.com/support/solutions/articles/5000549705

Title: Re: type error getclassinstances requires maxclass got undefined
Post by: vinidelimaa on 2020-10-05, 17:50:37

Thank you for the answer!

And sorry for the amateurism, but if the objetc is in "3D OBJETC" (OBJ), I have to convert anyway?

Title: Re: type error getclassinstances requires maxclass got undefined
Post by: maru on 2020-10-06, 16:09:00

If you have an object in .obj format, you can just import it in 3ds Max.
If this object has V-Ray material applied to it, you will be able to convert this material to a Corona Material using the converter script.
Please check this guide and the video in it: https://coronarenderer.freshdesk.com/support/solutions/articles/5000549705