You should be able to understand and implement an existing research paper (e.g. SIGGRAPH) or software system (e.g. a renderer/simulator) as well as reproduce the corresponding results.
Otherwise, you are not ready for a research or even a development position.
As a reference point, my first HKU PhD student, Jun Xing, once managed to reproduce 3 SIGGRAPH papers in a span of about 5 days (for sports).
🙂
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