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In Blender 2.93.5, I'm trying to create a geometry node group which slices a mesh along a regular array of parallel planes. I can get the desired effect by intersecting with a cube with an array modifier:

Intersect with cube with array modifier

However that doesn't allow me to calculate the array count within the node group. Instead of the array modifier, I tried using Point Instance to create cube instances along a line. The resulting output is empty. After tweaking the offset a bit (see below) I think I figured out what's happening: I want a 2-way intersection of (input geometry) with (array of n cubes), but this is producing an (n+1)-way intersection of the input geometry and all the cubes. Since the cubes are disjoint, the result is empty.

Intersect with line of cube instances

Is there a way to fix this? I tried adding a Join Geometry node after the Point Instance, but it didn't seem to make a difference.

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  • $\begingroup$ can u provide blend file? $\endgroup$
    – Chris
    Commented Dec 9, 2021 at 7:34
  • $\begingroup$ @Chris I added it. $\endgroup$
    – stewbasic
    Commented Dec 9, 2021 at 17:33

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If i understand you right, you want to cut an array with another array.

So a very simple setup works like this:

enter image description here

The cutter ist just a very flattened box.

enter image description here

result:

enter image description here

without boolean:

enter image description here

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  • $\begingroup$ Thanks! The key was to subtract width 0 cubes, rather than intersect with adjacent cubes. $\endgroup$
    – stewbasic
    Commented Dec 14, 2021 at 20:20

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