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Hey forum! I'm attempting to create a boolean/slicer function, where I can slice up the geometry of an object (https://www.sidefx.com/tutorials/building-the-slicer-setup-in-houdini/ this sort of thing). However it seems that I'm having an issue with the way that the primitives are being 'winded' by the boolean operator. When I try and polyextrude the slices created by the 'boolean' they go up and down randomly rather than just 'up'. It seems that no vertex/point/primitive attribute is affecting the polyextrudes understanding of 'UP' - i've read its calculated from some kind of ordering of vertex? Anyone have any ideas about how to fix this? I have attached a very minimal houdini file and an image of the problem. Thanks! <3 Sam winding_polyextrude.hip