If you select “Smash (project)”, then those faces will be smashed by projection onto the chosen plane (with distortions, of course). This happens without distortions becasue individual faces are folded to the same plane.
If you select “Unwrap and Flatten”, then all selected faces will be unwrapped (unfolded/unrolled) and laid on the plane chosen in the settings. Select one or more connected and ungrouped faces in your model and right-click on them to get the “Unwrap and Flatten Faces” context menu. This extension is useful for e.g. producing fabric or sheet-metal templates, laser-cutting templates, as CNC-prep, for texturing, etc.
This extension allows the user to do three things: Unwraps shapes and places their faces flat on the ground Flattening a shell in segments Description
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