@Anto, I think it's what I do :) 2017-09-26 10:34 GMT+02:00 Anto Matkovic <a...@matkovic.com>:
> I know you know for instances, if it's about closer equivalent to ICE. > ICE use instances, not ''real" copies. Expression to spread multiple > objects by Houdini instancer, I think it was (in times of H 14) something > like > ../../instobj`$myid` > where instance candidates are named instobj1, instobj2 an so on, while > "myid" is an integer attribute on points-carriers (created in any way you > want). > > Now back to "real copy" - I've noticed that in some cases, it's > significantly faster to use a plain Copy SOP, making a lot of ''in place" > copies, then to move their points by Point VOP or something. "In some > cases" seems to be everything except Line primitive (that's again from H > 14). There seems to be a big difference in working of 'plain' Duplicate SOP > and Copy to points SOP, anyway. > So in that way, first step is merge of all instancing candidates, then > Connectivity SOP to assign class attribute to each piece (that > Connectivity method will work only if one candidate = one island, > obviously). After that, Point VOP/Wrangle to save the number of points, > let's call it nbinitial attribute. Then, plain Duplicate SOP without any > transform, to reach final number of instances. Finally, in distributing > Point VOP, decoding is something like : point number converted to float, > divided by nbinitial and floored. Result is then multiplied by number of > candidates, to get proper spread and empty space for individual objects. > Class attribute is just added to result, to fill that ''empty space". Final > result is point number for importing the point attributes from Scatter Sop > or like. > While it is a bit complicated, method is quite fast, easy to repeat, and > it allows any kind of deformation on each "instance'', before-after > spreading. With some playing by expressions and custom parameters, no big > deal to sync the numbers on emitter and copies. > > ------------------------------ > *From:* Olivier Jeannel <facialdel...@gmail.com> > *To:* sidefx-houdini-l...@sidefx.com; "softimage@listproc.autodesk.com" < > softimage@listproc.autodesk.com> > *Sent:* Monday, September 25, 2017 5:23 PM > *Subject:* Multiple objects copy > > Kind of rooky question that I already asked but... > > So I have that "problem" with the copy sop (copy to point, whatever) when > I have to do a copy with multiple input objects. > It was something really easy within ice with high performances. > > I watched the sidefx tutorial, and so far I undertstood they deprecated > the stamp method for a copy within a loop.It's rather slow. > > I also saw a method where it copies all the multiple objects on each point > and then delete according to the ptnum the undesired copies. it gets very > slow when you have many different objects to copy and it eats memory. > > So I made my "own" method > The scenario was > working with packed > 10 different objects(platonic, torus, sphere, etc) > I have some scattered point > I have a noise (float) on the scattered points > I want to distribute my 10 objects according to the values of that noise > > so I divided my noise in 10 zones (based on grey float values) > I counted howmany of each object there was per zone(@numbperzone) > I copied each object the good amount > I placed each copy at its corresponding scattered point > > et voilà > > now for 10 objects distributed on 350000 points it takes under 10s. > https://drive.google.com/open?id=0B1QqhXD7Y15qVnBqMVhKeWl0dnc > <https://urldefense.proofpoint.com/v2/url?u=https-3A__drive.google.com_open-3Fid-3D0B1QqhXD7Y15qVnBqMVhKeWl0dnc&d=DwMFaQ&c=76Q6Tcqc-t2x0ciWn7KFdCiqt6IQ7a_IF9uzNzd_2pA&r=GmX_32eCLYPFLJ529RohsPjjNVwo9P0jVMsrMw7PFsA&m=3GgXr7vXI3XvILtD7xBQPi---UZ94ubTZoQx6E2PGoE&s=QjcHMPKLavzifrok_Sb3Yl6g8kEn8sL9kT1_TVZza_g&e=> > > That's my best method for now, but I have now idea if it's worth something. > > So how do you guys usually do ? > ------ > Softimage Mailing List. > To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com > with "unsubscribe" in the subject, and reply to confirm. > > > ------ > Softimage Mailing List. > To unsubscribe, send a mail to softimage-requ...@listproc.autodesk.com > with "unsubscribe" in the subject, and reply to confirm. >
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