How can I get Normal Vector of Sphere?

StackOverflow https://stackoverflow.com/questions/9415270

  •  12-11-2019
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문제

I have to implement simple ray tracing algorithm, but I can not figure out How can I get Normal Vector of the sphere If I have the origin and radius of the sphere and the direction of the ray. thanks Wiki aboute sphere but i can not figure it out of this

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