Igor Posted October 17, 2017 Share Posted October 17, 2017 I have 3D scanned Model to work in Houdini. I use Meshlab for make smooth form and find Curvature. If I want do it only in Houdini I can use Smooth Sop but Curvature is problem because Measure Sop give very wrong result. If I use method from this post from Petz - http://forums.odforce.net/topic/26380-vdb-curvature-flow/?do=findComment&comment=152998 - it works good but only if surface is closed. It is not work right on open surface because it use VDB. Is there better way to find curvature direct for Surface as in Meshlab? Thanks! Quote Link to comment Share on other sites More sharing options...
petz Posted October 20, 2017 Share Posted October 20, 2017 depending on your mesh and accuracy there exist numerous different algorithms to compute discrete curvature, all with their pros and cons. i don't think there's a single one which works flawlessly in all situations and for all meshes. anyways, here's a file i've posted a while ago on discord with different implementations. it might be a bit confusing without the conversation we had in the chat but you can just try which algorithm works best for you. (from left to right: classical taubin tensor using integral formula, tensor using euler formula, approximated shape operator, proper shape operator in surface space, polynomial fitting) hth. petz curvature.hipnc 6 Quote Link to comment Share on other sites More sharing options...
Igor Posted October 23, 2017 Author Share Posted October 23, 2017 @petzThank you very much. File is work perfect! Quote Link to comment Share on other sites More sharing options...
vinyvince Posted November 13, 2021 Share Posted November 13, 2021 On 21/10/2017 at 12:23 AM, petz said: depending on your mesh and accuracy there exist numerous different algorithms to compute discrete curvature, all with their pros and cons. i don't think there's a single one which works flawlessly in all situations and for all meshes. anyways, here's a file i've posted a while ago on discord with different implementations. it might be a bit confusing without the conversation we had in the chat but you can just try which algorithm works best for you. (from left to right: classical taubin tensor using integral formula, tensor using euler formula, approximated shape operator, proper shape operator in surface space, polynomial fitting) hth. petz curvature.hipnc Do someone know how Sidefx Curveness curvature is calculated? is there a way to get it for the gauss, mean and principal? Some labs tool failed to give me the result I want, trying to find a better way... cheers! @petz @f1480187 Quote Link to comment Share on other sites More sharing options...
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