[solved] Always the same color with CoronaMultimap

[archimi]

Hi everybody

I have a strange problem and I can't figure out where I made a mistake or if there is a bug.
I created basic objects by extruding Splines, except one which is a Box. All of these objects have been converted to Editable Poly. I even applied an Xform Reset to each of them. They are not linked to each other by anything.
And yet when I apply a basic material to them with a CoronaMultimap color set to “instance”, they all have the same color, regardless of the Seed value. (picture 1) And if I copy these objects, the new ones receive random colors. (picture 2) Where does this strange behavior come from?

I attached the Max file.
I am running 3ds max 2024.2 and Corona 11 (hotfix 1)

[romullus]

It's not a bug. All your objects share exactly the same name. Corona multi map uses object's names to identify them. Assign unique names to the objects and multi map will work as expected.

[archimi]

Thanks a lot for your answer.
I finally understand why !
I had tried everything except the name thing. I thought the software would use "internal" names and not the names we give.

thanks again

[romullus]

You're welcome. To be honest i find it strange too, but IIRC devs said that there's no other way how to address specific object in 3ds Max, other than by its name.