Re: Volume visualization strangeness

• To: Bill Hibbard <billh@xxxxxxxxxxxxx> <dwd@xxxxxxxxxxxxx>
• Subject: Re: Volume visualization strangeness
• From: John Osborne <John.Osborne@xxxxxxxx>
• Date: Fri, 14 Feb 2003 09:52:13 -0800

Bill:

Do you have a sense of how far out-of-square you have to go to see the
problem? I am also giving folks the ability to do interactive
iso-surfaces but haven't been able to make it work yet--I just get a
blank display. I'm using the Tutorial code as a starting point. Test62
doesn't seem to do anything either but the code also doesn't seem
complete either (from my first read of it). You're probably right to be
less concerned about aliasing with this type of visualization but the
memory issues can still be problematic with bigger grids.

oz

----- Original Message -----
From: Bill Hibbard <billh@xxxxxxxxxxxxx>
Date: Friday, February 14, 2003 9:31 am
Subject: Re: Volume visualization strangeness

> John,
> 
> > Looks like you're saying this is a feature. My concerns with 
> resampling> the grid to make things cubic are that I'm going to 
> pay a large memory
> > penalty (maore than an order of magnitude greater in the case of the
> > 61x61x5 example) and I risk aliasing the original grid. In addition,
> > users of ncBrowse will be stuck with how I choose to resample 
> the grid.
> 
> I wouldn't worry about the aliasing, since volume visualization
> isn't very quantitative. Its just a colored fog.
> 
> You could use a test to only resample beyond a certain degree
> of out-of-square. Also, give users a choice of other techniques,
> such as interactive iso-surfaces, that they can use when volume
> visualization isn't effective.
> 
> Also, I'd still be interested to see a JPEG or GIF of one of
> your problem images.
> 
> Bill
> 
> 

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