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hello
is this a bug ?
in v2 when we create metal and choose gold or copper ; maxwell create them with colors.
but in v3 the color of different metal ( gold ; copper .... ) material was grey ( only gold have preset )

There are fewer presets in the new Metal type yes. The "Metal IOR" parameter changes only the IOR of the metal (internally the nD and K values). So it's not a bug.

You can add more presets yourself by editing the Metal.xpr preset file in any text editor, found in: C:\Program Files\Next Limit\Maxwell 3\extensions\presets
You can easily see how to add another preset to that structure.

thanks ; that good
i will modify colors in the original file than create new presets