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I have this model from MagicaVoxel

enter image description here

Imagine I want the white petals to have metallic = 1 and roughness = 0. How can I do that?

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2 Answers 2

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You should be able to apply math filters to the Hue of the color. White has a near zero hue:

enter image description here

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This should get you started: enter image description here

1 - color is 0 for white (if you are using a color other than white anywhere, check clamp in the Subtract node). Note that the roughness will be a number around 0.3 for the green parts.
Separate color splits the color info into its channels, since the 2. petal is green, red is 0, while it's 1 for the white part. This is just an example of how to separate white and pure green (or at least no red). If the colors are mixed, for example: 0.1, 0.5, 1, you'll need to get a bit more creative, like using the threshold function of the math node to get it right.

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  • $\begingroup$ You'r answer is right but I consider @james_t simplier, so I select his answer. Thanks! $\endgroup$
    – Abel Gutiérrez
    Commented Nov 29, 2023 at 11:23
  • $\begingroup$ fair enough, thanks $\endgroup$
    – Frederik Steinmetz
    Commented Dec 1, 2023 at 8:37

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