Thank you Jonathan. Your sample made it clear to me. I was missing the SetLocal/GetLocal pair for storing the "state" of the group throughout the execution of the loop. To me "state" is something different that storage or cache, so it wasn't obvious to me what SetLocal/GetLocal were supposed to do. I can see now what is meant by "state."
Also, the statement in the documentation, "If this module is placed in the top level visual program, the entire program will be executed during the loop," suggested to me that it wasn't really possible to terminate a loop--although this seemed very unlikely to me. And the Route documentation didn't suggest using it as a loop terminator. Anyway, I appreciate your time and effort, and I am looking forward to doing more cool things with OpenDX. Thanks Al Quoting Jonathan Hedstrom <[EMAIL PROTECTED]>: > The way I do it as follows: > > Some_sliced_data --> Render/AutoCamera --> Append ( GetLocal,Render) --> > SetLocal --> ... > > For however many N. > > For N=1 (or 0) the Append takes a Null value from getlocal. > > ONLY after N cycles do you pass Append on to the Arrange module. I do > this by using the Route module with the LAST flag from the ForEachMember > module. Thus only the complete image set is passed onto Arrange. > > I'll send a separate email with an attached program to you. > > Cheers, > Jonathan > > __________________________________________________ > > Jonathan Hedstrom tel: (408) 927-3766 > IBM Almaden Research Center fax: (408) 927-2100 > 650 Harry Rd. [EMAIL PROTECTED] > San Jose, CA 95120 > > > > > [EMAIL PROTECTED] > Sent by: [EMAIL PROTECTED] > 10/03/02 01:51 PM > Please respond to opendx-users > > > To: [email protected] > cc: > Subject: Re: [opendx-users] Newbie: Collecting in a ForEachN > loop... > > > > The images are already rendered before they are Append'd. Although in the > final > example, I am just reading them from a file. Do you mean Render twice or > loop > twice? > > Yes, I would be very interested in seeing an example. > > Thanks, > > Al > > > Quoting Jonathan Hedstrom <[EMAIL PROTECTED]>: > > > Try sending the images through Render and AutoCamera first, then into > your > > Append/GetLocal/SetLocal loop. Finally run Append through arrange, only > > > after the final N--do this by using a Switch or Route module. I have > > written several various programs that do this, and I could send you one > as > > a sample if you want. > > > > Cheers, > > Jonathan > > > > __________________________________________________ > > > > Jonathan Hedstrom tel: (408) 927-3766 > > IBM Almaden Research Center fax: (408) 927-2100 > > 650 Harry Rd. [EMAIL PROTECTED] > > San Jose, CA 95120 > > > > > > > > > > [EMAIL PROTECTED] > > Sent by: [EMAIL PROTECTED] > > 10/03/02 10:11 AM > > Please respond to opendx-users > > > > > > To: [email protected] > > cc: > > Subject: [opendx-users] Newbie: Collecting in a ForEachN > > loop... > > > > > > > > I am relatively new to DX. The data set I have is a 3D intensity which > is > > generated by a modeling program. The data is generated in slices, and > > I've been > > able to import and display the data in 3D. However, this type of data > has > > not > > been traditionally displayed as a 3D isosurface, but rather as a series > of > > slices taken through one direction. Typically the 2D images are > collected > > together to form a single diagram which contains several 2D intensity > > plots. I > > am hoping to display the information in a tradional way while providing > a > > mechanism to view the data in more sophisticated ways. > > > > For each slice, I run the data through Isosurface to create the > isolines, > > and in > > parallel run it through RubberSheet to get a colorized intensity. These > > > two > > images are Rendered and Overlay'd to get a single plot which shows a > color > > representation of the intensity and several of the isolines. > > > > What I am having trouble with is the collecting of these images into a > > single > > Display. Since the number of files/slices generated can be variable, I > > didn't > > want to limit my network to fixed number of slices. So, I tried to > > implement > > the importing of the data as a ForEachN loop. The original idea was to > > import > > each file, create the colorized intensity plot, and arrange it with the > > other > > plots, but the arranging does not work the way I would expect. Instead > of > > showing each plot side-by-side, it shows each plot in sequence at the > same > > spot. > > > > To simplify the task, I generated image files for each of the plots and > > wrote a > > small network which reads these files with a ForEachN loop. The file is > > > added > > to a group using Append, and sent to Arrange. This doesn't work. I've > > tried > > Collect, CollectSeries, CollectNamed, and Append, but in none of the > cases > > does > > the Arrange create an array of plots. However, if I read each file in > > separately with a ReadImage for each file (instead of the ForEachN > loop), > > the > > Arrange works fine. The problem seems to lie in the fact that every > time > > through the loop, the group used by Append, Collect, CollectSeries, > > CollectNamed > > is reinitialized or created fresh. The Append does not append to a > group > > within > > a ForEachN loop. > > > > The documentation makes it clear that a ForEachXX loop used in a > top-level > > network means that everything within that network gets executed for each > > > time > > through the loop. It suggested using a macro if this wasn't the desired > > behavior. So, I moved the reading of the images into a macro and tried > to > > output the group of images to be fed into the Arrange. However, the > > Append, > > Collect, CollectSeries, and CollectNamed work exactly the same way, i.e. > > > they do > > not continue to collect items into a previously created group. I even > had > > the > > group be an input into the macro and used Append within the macro, but > > this > > didn't work either. IN EVERY CASE, if I output the group each time > > through the > > loop with a Describe, it said that the group contained exactly ONE > member. > > I > > should probably point out that I did use the index of the loop as an > input > > into > > the Append and CollectSeries, but this had no effect. > > > > Am I missing something simple when it comes to working with groups? It > > seems to > > me that one should be able to compile a group within a loop and use that > > > group > > outside of the loop. Is there an easier way to do this? All of the > > examples > > that use groups or Arrange do so with manually (i.e. not within a loop) > > created > > groups. Does someone have an example of using a group within a loop? > > > > Some more side questions, how do you use the "last" parameter of the > > ForEachXX > > loops? If everything within a top-level network is executed each time > > through > > the loop, why would someone need to know you've reached the last item? > > Wouldn't > > this be the same as ending a loop (which apparently you cannot do in a > > top-level > > network)? Would this provide a method for executing something after the > > > loop is > > done? > > > > To test further, I attempted to use the SimpleGetSetLoop.net example to > > execute > > my loop. This has the same effect. > > > > It is probably not critical that I get an answer to this as I can do > what > > I want > > with a fixed number of inputs. But this seems to be a poor solution to > > the > > problem. I would imagine there is a simple solution, or this is a > serious > > deficiency (in my opinion) in the program. If anyone is interested, I > can > > forward my examples and some data. > > > > Thanks for the help. > > > > Al > > > > > > > > > > ------------------------------------------------- > > This mail sent by http://webmail.rushmore.com > > > > > > > > > > > ------------------------------------------------- > This mail sent by http://webmail.rushmore.com > > > ------------------------------------------------- This mail sent by http://webmail.rushmore.com
