Custom spacing between instances?

Question

Is it possible to use a repeating, or customized, spacing between instances?

For example, the geometry nodes below space the instances out evenly, but what nodes would be needed to create this A/B/A/B type repeating spacing between the instances?

I've been looking around and have only found these nodes below that hide every 3rd instance:

... but that's not what I'm looking for and am hoping to show all the instances with just the space between them altered. Thanks!

Answer 1

The simple solution could look like this:

• First create a Mesh Line whose Offset equals $A+B$.
• With the help of the node Duplicate Elements this line is then simply duplicated.
• The Duplicate Index is then queried with Compare, which marks the points of the duplicated line and then move them with Set Position.
• Finally you can remove the last point again with a Compare node, using the number of total points.

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An even simpler alternative would be this one:

• First create a Mesh Line whose Offset equals $A+B$.
• Then subdivide this line with Subdivide Mesh, which gives you more points in between, but with higher indices.
• Compare these indices with a Compare node and move the points with Set Position.

_{(Blender 3.2+)}

Answer 2

I think I found another solution that fits what I'm trying to do by using an accumulate field. I've attached the node layout below and highlighted the editable A and B distances.

There's also the excellent solution put forth by quellenform above.

Thanks! This question is answered.