kubabuk Posted December 5, 2007 Share Posted December 5, 2007 I am trying to roll and unroll the surface, some sort of "toilet paper" effect (sorry, that exactly describes what I am looking for). The crucial thing is to have the surface to start rolling from the tip (end point) not from the bottom, which is pretty simple to recreate using lsys. (have a look at the attached image) I am looking for as simple solution as possible, trying to avoid dynamics, particles etc. so ideally I am interested in chops, expressions or some l-system neat expression. I also got a nice shape with a creep sop, creeping curve over a tube and using small translation on z to get a spiral, but from that point have no idea hot to unroll it... anyway if any of you have some ideas, looking forward to them. thanks kuba Quote Link to comment Share on other sites More sharing options...
symek Posted December 5, 2007 Share Posted December 5, 2007 hey kuba, http://www.sidefx.com/index.php?option=com...&Itemid=132 Video part 3 may help, sy. Quote Link to comment Share on other sites More sharing options...
rdg Posted December 5, 2007 Share Posted December 5, 2007 Video part 3 may help, I tried something similar some time ago: unrolling a fern-like plant. I tried to use spiral expressions (sin(x),cos(z)) with animated radii and centers. All that curled was my brain ... I just forgot about it, be rethinking it might be usefull to introduce some rotation as well. Georg Quote Link to comment Share on other sites More sharing options...
kubabuk Posted December 5, 2007 Author Share Posted December 5, 2007 Thanks Symek, forgot about that, nice example but this is exactly opposite way I want to unroll. I am looking for the way the external part would stay in place and the core rotate and slowly unfold... Quote Link to comment Share on other sites More sharing options...
sibarrick Posted December 5, 2007 Share Posted December 5, 2007 Maybe take a look at the wireblend sop. It blends angles so you can unroll a curve, from that you could build up your full geometry. Quote Link to comment Share on other sites More sharing options...
kubabuk Posted December 5, 2007 Author Share Posted December 5, 2007 still not perfect, but... unroll.hip Quote Link to comment Share on other sites More sharing options...
mike Posted December 6, 2007 Share Posted December 6, 2007 (edited) I found an old, old tutorial from 1994..... (prisms time) It's not exactly what you want, but it also covers some interesting points. Edited December 6, 2007 by mike Quote Link to comment Share on other sites More sharing options...
symek Posted December 6, 2007 Share Posted December 6, 2007 this is brilliant! Thanks! I was in high school and they where rolling carpets just like that... Quote Link to comment Share on other sites More sharing options...
Rafal123 Posted December 6, 2007 Share Posted December 6, 2007 yeah cool tutorial Quote Link to comment Share on other sites More sharing options...
meshsmooth Posted February 25, 2008 Share Posted February 25, 2008 also you can use a Lsystem with shortening segments and animate the angle i cant rember the rules now but think about it. Quote Link to comment Share on other sites More sharing options...
kubabuk Posted May 8, 2008 Author Share Posted May 8, 2008 Hi all, Thanks to mike for sharing, here's what I've come up to, the idea remains almost the same, but because houdini has change a little bit some things had to be worked around. kuba spiral_otl.hip 3 Quote Link to comment Share on other sites More sharing options...
mestela Posted June 11, 2017 Share Posted June 11, 2017 Just to keep this sort of up to date, the new(ish) bend sop in H16 makes this effect easier: https://www.sidefx.com/forum/topic/49396/ Quote Link to comment Share on other sites More sharing options...
Noobini Posted June 11, 2017 Share Posted June 11, 2017 (edited) don't mean to hijack...but I did these awhile ago in Max MCG....I'm absorbing Houdini like a sponge as you might have noticed thru various posts and would one day hope to do these in Houdini... Is there something already though ? Basically, given any spline(s), curl it (..well, curl a copy)...it was more challenging to do the curl vertically instead of flat on surface. Edited June 11, 2017 by Noobini 1 Quote Link to comment Share on other sites More sharing options...
mestela Posted June 11, 2017 Share Posted June 11, 2017 Nope, nothing out of the box. That's a very cool effect tho, nice chewy challenge to replicate in Houdini! Quote Link to comment Share on other sites More sharing options...
Noobini Posted June 11, 2017 Share Posted June 11, 2017 any remote chance I have of tackling this in houdini would be via VOPs...coz I'm not a coder...that was same in Max, know nothing of maxscript so just wired nodes together. Need to at least double triple quadruple my current VOP experience tho... Quote Link to comment Share on other sites More sharing options...
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