For drawing the cut part, just ignore the raymarching anywhere where the first ray distance < 0, since that means it's already inside the surface.
For clipping the result to a sphere, just get the distance of the final ray position to the origin and mask out anything > sp. radius

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I have raymarched a black hole

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クツの作り始め。
ベースの形状。

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Oh Goody! A newly minted NFT titled "Disco balloons" on hic et nunc! Tweaked and twisted raymarched fractal https://t.co/xcpOhDtCp7

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