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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi Jiang,
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<div>Please see this article to see how findpts works: </div>
<div><a href="https://www.kth.se/social/files/5b14371756be5b899ec4af73/noorani_peplinski_schlatter_2015.pdf" target="_blank" style="font-size: 10pt;">https://www.kth.se/social/files/5b14371756be5b899ec4af73/noorani_peplinski_schlatter_2015.pdf</a> . </div>
<div>Also see this:</div>
<div>https://github.com/gslib/gslib/blob/master/src/findpts.c#L139</div>
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<div>For a given point, findpts does not return ix,iy,iz inside an element.. That does not make sense because likely the sought point does not coincide with a GLL point. findpts returns the coordinates of the sought point in reference space i.e. r,s,t in [-1,1]
inside that element. If you are not sure what reference space coordinates are, I would suggest reading up on it.</div>
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<div>Ketan</div>
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