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Re: 3D images [message #39844 is a reply to message #39843]

Mon, 21 June 2004 06:31

Timm Weitkamp
Messages: 66
Registered: August 2002

Member

On 18.06.04 at 13:49 -0700, Aleks wrote:

> Hello,
> this board has been very helpful and I was wondering if anyone could
> help me with the following.
> I'm trying to construct a cylinder. I made a circle in photoshop and
> made 10 copies of the file just renaming it. (example circle_01.tiff,
> ...._02.tiff etc)
>
> [...]

If those images do not contain anything more than a binary image of a
cylinder, then the best is to forget Photoshop and do everything in IDL.
Like this, for example:

;; (code starts here)

nx = 1600
ny = 1200
nz = 80
radius = 500.0

;; Define coordinates

xVec = FINDGEN(nx) - (nx -1 ) / 2.0
yVec = FINDGEN(ny) - (ny -1 ) / 2.0
x = xVec # (1.0 + FLTARR(ny))
y = yVec ## (1.0 + FLTARR(nx))
r = SQRT(x^2 + y^2)

;; Calculate image of filled circle

circle = r LT radius

;; Extend circle into third dimension

cylinder = REBIN(circle, nx, ny, nz)

;; "Cap" cylinder with zero slice on top and bottom

cylinder[*, *, 0] = 0
cylinder[*, *, nz-1] = 0

;; Fire up Slicer3 to visualize interactively

SLICER3, PTR_NEW(cylinder)

;; (code ends here)

In "Slicer3" you can then simply have a 3D isosurface plot drawn by
selecting "Mode: Surface", then "Low", and clicking on "Display". After
that, there are lots of ways to change angles, color, etc.

There are alternatives to SLICER3, among which are XVOLUME and Volume
Objects. Just try and see which suits you best.

Hope this helps

Timm

--
Timm Weitkamp <http://people.web.psi.ch/weitkamp>

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[Message index]

		Re: 3D images By: Timm Weitkamp on Tue, 22 June 2004 04:54
		Re: 3D images By: David Fanning on Mon, 21 June 2004 12:01
		Re: 3D images By: jnettle1 on Mon, 21 June 2004 12:00
		Re: 3D images By: siliconcube on Mon, 21 June 2004 09:46
		Re: 3D images By: David Fanning on Mon, 21 June 2004 06:39
		Re: 3D images By: Timm Weitkamp on Mon, 21 June 2004 06:31
		Re: 3D images By: jnettle1 on Sat, 19 June 2004 23:54

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