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This question already has an answer here:

Thanks! A very simple but great way to estimate mean curvatures@NathanReed answer. For my case, I also need an estimate of triangular mesh curvature, and I support this is what i was looking for. However, could you please show me (or any recommended literature) how is the following equation derived?

$$\frac{(n_1 - n_0).(p_1 - p_0)}{||p_1 - p_0||^2}$$

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marked as duplicate by Noah Witherspoon, Nathan Reed, Simon F, Julien Guertault, Alan Wolfe Sep 21 '17 at 23:47

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    $\begingroup$ Hello, welcome to CGSE. It's difficult to infer the context of your question when it is just referring to someone's answer. Could you please quote and/or link the relevant discussion in your question? $\endgroup$ – Julien Guertault Sep 19 '17 at 8:39
  • $\begingroup$ please kindly click this link: computergraphics.stackexchange.com/questions/1718/… $\endgroup$ – H. Wang Sep 19 '17 at 10:52
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    $\begingroup$ I've extended my original answer with more explanation about the derivation of the formula. I think this question can be closed. $\endgroup$ – Nathan Reed Sep 21 '17 at 5:34

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