Carve a scoop out of a Rhino 3D Ellipsoid

1. Get significant curves from existing scoop polysurface and adjust back part to be straight (green group)
2. Build a network surface (blue)
3. Offset its border 0.05 (red) and trim upper body
4. Blend the 2 surfaces Option 1.0 (continuity) on body border and Option 0.0 on network surf border

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