So there are several nodes called "sample ...". For example, Sample Nearest, that can find a point by its attribute "position"

But I want to search by other attributes, for example Mesh island index.

There is a setup that I struggle with:

I use UV pack node to pack my meshes in a square. But my meshes are not single meshes, so I have to use Convex hull or Bound box, to make one mesh per object.

Then I want to get an offset that comes from UV Pack, since I disabled rotation, it should be even for every point in the same mesh island. But how do get it? I have to search in meshes to get at least one point with mesh island index that matches instance index. How to do this?

Setup doesn't work, Sample nearest doesn't work with a custom attribute.

So there are several nodes called "Sample ..." - for example, Sample Nearest - that can find a point by its attribute "position".

However, I want to search by other attributes, such as Mesh island index.

I am currently struggling with a particular setup:

I am using the UV pack node to pack my meshes in a square. However, my meshes are not single meshes, so I have to use Convex hull or Bound box to create one mesh per object.

Afterwards, I want to obtain an offset that originates from the UV Pack. Since I disabled rotation, this offset should be the same for every point within the same mesh island. However, I am unsure how to retrieve it. I need to search within the meshes to find at least one point with a mesh island index that matches the instance index. How can I accomplish this?

Setup doesn't work, Sample nearest doesn't work with a custom attribute.