[vwnc] Problems accessing external C libraries (through SWIG interface)

>On Wed, Jan 6, 2010 at 8:33 AM, Stefano Franchi <[hidden email]
>
>> wrote:
>>
>> Dear all,
>>
>> I am trying to interface to an external library through an interface
>> generated
>> by SWIG/smalltalk. I am not successful, however, and I am having problems
>> trying to find the source of the bug.
>> The external call fails with:
>>
>> Unhandled exception: exception occured  #(11 140208237463482)
>
>IIRC, on linux the error number 11 refers to the signal number (11 =
>SIGSEGV) and the exception code is the pc at which it occurred.

> Hi,
>
> I have a 3D array that's data values represent density of an object
> in air. (The data ranges from 0.0 or there about to say 0.7.) Using
> JUN's implementation of octrees I can display the data which is above
> a threshold. What I'd really like to do is to use the alpha channel
> to represent the density values so that the one can view the object
> and see there are regions of higher or lower density in the object.
> Currently all the voxels displayed are the same.
>
> Any suggestions?
>
> Thanks,
> Jim
>
>    

>On 08.01.2010 22:27, Jim Harsh wrote:
> > Hi,
> >
> > I have a 3D array that's data values represent density of an object
> > in air. (The data ranges from 0.0 or there about to say 0.7.) Using
> > JUN's implementation of octrees I can display the data which is above
> > a threshold. What I'd really like to do is to use the alpha channel
> > to represent the density values so that the one can view the object
> > and see there are regions of higher or lower density in the object.
> > Currently all the voxels displayed are the same.
> >
> > Any suggestions?
> >
> > Thanks,
> > Jim
> >
> >
>Switch to use the OpenGL interface included on 7.7/from Store.
>I'm serious.
>Getting this to work in Jun is just too much effort.
>
>Here's a list of the things you'd need to do this easily, none of which
>are easy to tack onto Jun
>Either:
>- 32bit texture support. (should be easier in 7.7)
>- Do all raytracing /viewport adjustment on CPU (will still be dog slow)
>Or:
>(Hard on Windows, easier if you only need Mac/Linux support)
>- Add Pixel shader support.
>- Add 3dTexture/VBO support, depending on the range of graphic cards you
>intend it to run on.
>
>Cheers,
>Henry
>_______________________________________________
>vwnc mailing list
>[hidden email]
>http://lists.cs

>Hi Jim,
>
>Would it be possible to put different diameter spheres in each voxel, so
>that large diameter objects indicate greater density? I know, that's not
>nearly what you want. Another approach would be to simulate (at some
>expense) density using a random distribution of "points" in each voxel,
>more points in the dense volumes, etc. Not at all as nice as a fog
>effect, which I believe you're after. But, it might be easier over the
>short term.
>
>- Dave
>
>______________________________________________________________________
>Dave Wallen                      e-mail:  [hidden email]
>Development                       phone:  (707)620-0076 or (408)216-4580
>Cincom Systems, Inc.                fax:
>
>http://www.cincom.com/visualworks
>
>______________________________________________________________________
>
>
> > -----Original Message-----
> > From: [hidden email] [mailto:[hidden email]] On
>Behalf
> > Of Jim Harsh
> > Sent: Friday, January 08, 2010 1:28 PM
> > To: [hidden email]
> > Subject: [vwnc] volume rendering in JUN
> >
> > Hi,
> >
> > I have a 3D array that's data values represent density of an object
> > in air. (The data ranges from 0.0 or there about to say 0.7.) Using
> > JUN's implementation of octrees I can display the data which is above
> > a threshold. What I'd really like to do is to use the alpha channel
> > to represent the density values so that the one can view the object
> > and see there are regions of higher or lower density in the object.
> > Currently all the voxels displayed are the same.
> >
> > Any suggestions?
> >
> > Thanks,
> > Jim
> >
> > _______________________________________________
> > vwnc mailing list
> > [hidden email]
> > http://lists.cs.uiuc.edu/mailman/listinfo/vwnc