Sphere eversion is the mathematical process of turning a sphere inside out in three-dimensional space. It can be done smoothly and continuously without cutting, tearing, or creating sharp creases, provided the surface is allowed to pass through itself via self-intersections.
There a two script version of the Addon, both with a animation function, but the are both with different focus.
N-panel tab "Eversion"
- Progress slider (0=sphere, 0.5=halfway model, 1=inside-out) + quick-jump buttons
- Shape: arm count n (2 = the 4-armed quadrifolium look in your image; 3 = Boy-surface variant)
- Q (twist range), radius scale
- Resolution & Precision: ring/segment counts, plus the two epsilon clamps needed for the removable singularities at the poles and at the wormhole-inversion phase boundary (same spirit as the pole handling in your Wente torus addon)
- Appearance: vertex-color latitude gradient (blue→green→yellow, baked as a Color Attribute + Principled BSDF) plus a wireframe-overlay toggle to get that gridded look from the poster
- Animation: frame-change handler that drives Progress from the timeline (matches your spherical-harmonic addon's pattern), plus a bake operator
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- Publishing: First public upload of the Add-on.
