Thanks Matt, I've managed to do the first task of isolating and creating and indexing the islands in ICE. Here's the tree, I got the setup from a a forum somewhere, I think they based their setup on Helgees method.
https://dl.dropbox.com/u/2741653/icetree.jpg It's the second pass that I'm having trouble with, how to point sample a noise function for each island, or average it between the vertices of each island. This is all getting passed to the RT as attributes. On Mon, Nov 12, 2012 at 11:17 AM, Matt Lind <ml...@carbinestudios.com>wrote: > What you need to do is break the problem down into 2 or more passes. The > first pass identifies and tags polygon islands. The second pass applies > the turbulence effect. > > Identifying polygon islands is a one-time process which you should be able > to accomplish using a scripted command which identifies the islands and > tags them by creating array nodes in an ICE Tree and stores the results as > custom ICE attribute data. > > The second pass can be completed in ICE by reading the custom attribute > data and applying the turbulence as needed. > > Matt > > > > ------------------------------ > *From:* softimage-boun...@listproc.autodesk.com [ > softimage-boun...@listproc.autodesk.com] On Behalf Of Simon van de > Lagemaat [si...@theembassyvfx.com] > *Sent:* Saturday, November 10, 2012 8:57 PM > > *To:* softimage@listproc.autodesk.com > *Subject:* Re: polygon island attributes > > Ya I'm looking for a poly island solution which I had kind of thought > wouldn't be straight forward. I'm pretty slow when it comes to putting > around ICE but I've been thinking of some hacky conceptual methods of doing > it. > > 1. creating a particle at the center of every island, getting that > particle to sample a turbulence noise and then passing that value to the > island. > > 2. mapping only one point on the island then passing that value to the > other island points. > > I'm sure there are better ways to do it but those are what my artist > brain came up with so far. I'm not sure about what would require scripting > and what wouldn't > > On Sat, Nov 10, 2012 at 8:39 PM, Alan Fregtman <alan.fregt...@gmail.com>wrote: > >> Hi Ciaran, >> >> That would work for polygons individually, but Simon seems to be >> asking about polygon islands (so multiple polys per island.) That's >> quite tricky to get via ICE alone without scripted help. >> >> On Sat, Nov 10, 2012 at 11:15 PM, Ciaran Moloney >> <moloney.cia...@gmail.com> wrote: >> > Dive inside the turbulence compound and replace any instances of >> > pointposition with polygonposition. Also, swap polygonindex for point >> ID. >> > >> > >> > On Sat, Nov 10, 2012 at 12:21 AM, Simon van de Lagemaat >> > <si...@theembassyvfx.com> wrote: >> >> >> >> Hey all, >> >> >> >> A while ago I asked how to assign random attributes to polygon islands >> and >> >> I've recently revisited that task and used a couple of methods using >> the get >> >> array minimum technique. >> >> >> >> Currently I'm just assigning purely random values using a random value >> >> node which has my custom poly island indices plugged into it. What >> I'd like >> >> to do is find a way to drive each islands value via a worley noise or >> >> turbulise node so I can get a more patterned, less random change to the >> >> values from island to island. The issue is finding a way to sample the >> >> noise at one point for each island and I'm not sure how to go about >> that. >> >> >> >> If you have any ideas or could point me to something I'd love to hear >> from >> >> you. >> >> >> >> Cheers. >> > >> > >> > >
