logix1390 Posted June 23, 2021 Share Posted June 23, 2021 Hello, I am trying to simulate a simple tree using vellum. It is a simple default L-system tree in Houdini. The problem is that it collapses to the ground no matter what I do. I tried increasing the bend and stretch stiffness on the vellum constraints to a really high number but nothing seems to make it stand on its own. I am going a little crazy . Any help would be greatly appreciated. Thank you tree_vellum.hip Quote Link to comment Share on other sites More sharing options...
Noobini Posted June 23, 2021 Share Posted June 23, 2021 if i could get 1 dollar for every time someone runs into this same problem again and again...i'd be a billionaire https://www.sidefx.com/tutorials/vellum-constraint-features-john-lynch-h18-masterclass/ go to 04:00:00 file included Quote Link to comment Share on other sites More sharing options...
logix1390 Posted June 23, 2021 Author Share Posted June 23, 2021 @Noobini That's the video I'm following. I'm putting in the exact same values but mine collapses like someone poured acid on my tree. I opened up the sidefx file and copied over the vellum constraint that he uses, and it works fine. Makes no sense because I'm using the exact same values. My Houdini version is 18.5.408. I'm wondering if the vellum constraints node has changed since that masterclass came out. I will attach my new file comparing the sidefx constraints and mine. Thanks tree_vellum2.hip Quote Link to comment Share on other sites More sharing options...
Noobini Posted June 23, 2021 Share Posted June 23, 2021 8 hours ago, logix1390 said: @Noobini That's the video I'm following. I'm putting in the exact same values but mine collapses like someone poured acid on my tree. I opened up the sidefx file and copied over the vellum constraint that he uses, and it works fine. Makes no sense because I'm using the exact same values. My Houdini version is 18.5.408. I'm wondering if the vellum constraints node has changed since that masterclass came out. I will attach my new file comparing the sidefx constraints and mine. Thanks tree_vellum2.hip Everytime someone said I did EXACTLY the same as the video but it doesn't work....I always say to myself....NO, I don't believe you. that's not being rude....that's from experience...think about it...if it was EXACTLY the same it would have worked. So, in vellumhair...look very carefully at your Bend stiffness...you have 10e-10 when it should really have been 10e+10 HUGE difference. Quote Link to comment Share on other sites More sharing options...
logix1390 Posted June 23, 2021 Author Share Posted June 23, 2021 @Noobini wow yeah.. that would be it. Thanks Noobini. Quote Link to comment Share on other sites More sharing options...
tamagochy Posted June 24, 2021 Share Posted June 24, 2021 Vellum still not best way for simming hard objects. Better use wire sim. More stable more predictable. 1 Quote Link to comment Share on other sites More sharing options...
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