Re: Some problems with visad

• To: Martin Jung <Martin.Jung@xxxxxxxxxx>
• Subject: Re: Some problems with visad
• From: "From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>" <billh@xxxxxxxxxxxxx>
• Date: Thu, 16 Aug 2001 13:22:14 -0500 (CDT)

Hi Martin,

> I am trying to implement a small display software for larger amount of 
> simulator data, and encountered a few problems I would like advice on:
> 
> 1. How to store images produced by visad.
> The obvious way: displayImpl.getImage() does not seem to work, it produces an 
> Exception:
> Exception occurred during event dispatching:
> visad.VisADError: cannot call getImage() from Thread: AWT-EventQueue-0
> I am calling the getImage() method out of the actionPerformed() method of my 
> 'Save Image' Buttons actionHandler.
> Is there something I missed, or how does one save an Image?

You are probably trying to call getImage() from within an AWT
callback. In your callback, construct a new Thread for your
calls, as in visad.ss.SpreadSheet.java, lines 758-780.

> 2. The amount of data.
> The data I try to display is apparently larger than a 220MB Java-VM is able 
> to handle. Are there any numbers, how much memory visad needs for it's 
> display?
> I am trying to display a dataCube, and as long as the Cube has less than 
> 50x50x50 cells, everything works out well, but beyond that, I get an 
> OutOfMemoryError.

Volume rendering (as in visad/examples/Test61.java) uses a
lot of memory. You might first experiment displaying your
data with an iso-surface (as in visad/examples/Test01.java).

However, 50x50x50 cells is not very big. I suspect that there
is some other problem here.

Good luck,
Bill

• References:
  • Some problems with visad
    • From: Martin Jung