Reflective solid / 01
Opaque silver cutaway
Geometry
Every surface is opaque, depth-writing metal. The front half of the hemispherical shell is simply absent, so the cut rim and the raised meridian/parallel grid expose the ball inside.
x = R·sinθ·cosφ, y = R·cosθ, z = R·sinθ·sinφ, φ ∈ [π, 2π]
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