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I have a pretty simple geometry node based on a plane: enter image description here

What it does, it takes an hexagonal polygon as mesh, places it on a grid (yellow hexagons on the picture below - same color than source object), then translates the same point (which gives the red polygons - color of supporting plane).

How come there are 2 colors and not a single one ? enter image description here

Link to the Blend file:
https://www.dropbox.com/s/1jmdsjl7bpq8gbb/Polygones.blend?dl=0

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    $\begingroup$ can u provide blend file? $\endgroup$
    – Chris
    Commented Oct 10, 2021 at 11:49
  • $\begingroup$ Link attached in the question $\endgroup$
    – Laurent Crivello
    Commented Oct 10, 2021 at 12:09

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ok, first, i think you wanted to do something like this:

enter image description here

result:

enter image description here

you did translate your mesh after instancing. After the instancing it is a "new" mesh. So if you translate that mesh again it will take the material from your plane (which is your GN object), that's why these polygons are red.

You can "verify" this by using attribute separate node xyz with position.

enter image description here

If you try to access these x,y,z after the instancing you can't access it. Before instancing you can.

Of course now there is a workaround for this with the attribute transfer node.

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  • $\begingroup$ Wow, thanks a lot ! Indeed I'm a Blender newbie. $\endgroup$
    – Laurent Crivello
    Commented Oct 10, 2021 at 14:59
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    $\begingroup$ You are welcome. We all started once….😉 $\endgroup$
    – Chris
    Commented Oct 10, 2021 at 15:00
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    $\begingroup$ ...and when Fields are fully functional, we will all have to start again ..:) $\endgroup$
    – Robin Betts ♦
    Commented Oct 10, 2021 at 15:52

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