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Re: voxel_proj and seg fault [message #29545 is a reply to message #29523]

Wed, 27 February 2002 12:11

Jeff Guerber
Messages: 41
Registered: July 2000

Member

Seems to run OK on { hp_pa hp-ux unix hp-ux 5.5 Aug 28 2001 32 64}.
"result" is all 0 or 255, with all 3 planes identical. When displayed
with tv they appear to be slightly skewed blocks, all white except for
black in the upper left and lower right corners. No underflow messages.

Jeff Guerber

On Wed, 27 Feb 2002, Jacques Basson wrote:

> Hi all
>
> I seem to be getting segmentation faults when using the interpolate
> keyword to voxel_proj (strangely enough, removing the rotations gets rid
> of the segfault, but then that's not exactly useful). It is repeatable
> on several machines running linux or solaris. xvolume works fine, but is
> not configurable enough (automating translations / getting a contour
> plot instead of an image out of the thing...).
>
> Does anyone know of a suitable workaround, apart from not using the
> interpolate keyword - it's nice to have smooth-looking final plots :)
>
> Cheers,
> Jacques
>
> -----------------------------------------------------------
> IDL> print, !version
> { x86 linux unix linux 5.5a Feb 7 2002 32 32}
> IDL> n = 192
> IDL> vol = randomu(1, n+6, n+6, n+6)
> IDL> for i=0,10 do vol = smooth(vol, 3)
> IDL> vol = bytscl(vol(3:n+2, 3:n+2, 3:n+2))
> IDL> !x.s = [0.,1.] / (n-1)
> IDL> !y.s = [0.,1.] / (n-1)
> IDL> !z.s = [0.,1.] / (n-1)
> IDL> t3d, /reset, translate=[-0.5,-0.5,-0.5]
> % Compiled module: T3D.
> IDL> t3d, rotate=[60,0,0]
> IDL> t3d, rotate=[0,0,-80]
> IDL> t3d, translate=[0.5,0.5,0.5]
> IDL> rgbo = bindgen(256)#[1,1,1,1]
> IDL> result = voxel_proj(vol, rgbo, /interpolate)
> Segmentation fault
> -----------------------------------------------------------

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[Message index]

		Re: voxel_proj and seg fault By: Jacques Basson on Thu, 28 February 2002 01:08
		Re: voxel_proj and seg fault By: Jeff Guerber on Wed, 27 February 2002 12:11
		Re: voxel_proj and seg fault By: Rick Towler on Wed, 27 February 2002 10:13
		Re: voxel_proj and seg fault By: David Fanning on Wed, 27 February 2002 07:37
		Re: voxel_proj and seg fault By: Jacques Basson on Wed, 27 February 2002 07:22
		Re: voxel_proj and seg fault By: David Fanning on Wed, 27 February 2002 06:03

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