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Script to toggle all surface normals outward?

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We are developing a plug-in for Autodesk PowerMill to achieve fully autonomous CAM programming launched from Rhino. To succeed with autonomous 5-axis programming we need to make sure all the surface normals are facing outward in our models. The nature of our product dictates that many models are surface files and not closed polysurfaces. Has anyone written a script that toggles all surface normals outward? It’s on my to-do list, but I thought I would reach out to the Rhino community first and see if this already exists, or if anyone has suggestions on the best way to approach this.

Thanks in advance,

Dan

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