Bump issue...

[Njen]

Why does the bump not work in the lower example? It seems simple enough: a checker map being used in a CoronaMix as 'mix' between black and white.

[romullus]

Because it's max's "feature". Bump is treated differently than other slots and has tons of limitation. If possible, try to bake your bump maps and then plug them as bitmaps.

[Njen]

Hmmm, I did know of the limitations of Max bump in it's own renderers, though I didn't realise that extended to other renderers too.

Thanks.

[maru]

Yup, try using color correction with a bump map. ;)

[Juraj]

though I didn't realise that extended to other renderers too.

I still don't get this part either :- ) Corona has the best integration within 3dsMax alongside Vray, I guess that comes with its own drawbacks.

[Christa Noel]

maybe, a note "coronamix doesn't support bump" just like in coronaoutput would be useful.
but in https://corona-renderer.com/bugs/view.php?id=303, ondra said limitation was added. but sorry, I don't understand about what "added limited support" is..

[Ondra]

it means the support was added to the basic modes, such as add, subtract, multiply

[Ludvik Koutny]

V-Ray has great texture map for it, called Color2Bump, it basically takes RGB and converts it to bump.

In Corona, it would be great to have simple option in CoronaMTL whether to take bump from bump channel, or convert it from RGB. The second option would be very useful, because color corrections like output map would finally affect bump, and things like mix map would work flawlessly.

[Christa Noel]

it means the support was added to the basic modes, such as add, subtract, multiply

but, now bump still doesn't support coronamix even with the basic modes you mentioned.
I hope don't misunderstood something