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Re: 3D VOLUME VISUALIZATION [message #42099 is a reply to message #34070]

Mon, 03 January 2005 13:55

idle
Messages: 4
Registered: January 2005

Junior Member

Antonio Santiago wrote:
> idle wrote:
>> Is there any way to make the volume transparent so one can see
through
>> the volume instead only the front plane? Thanks!
>>
>
>
> I supossing you are talking about IDLgrVolume. The RGB_TABLE0 is the
> color table (256x3 array) for your DATA0 data and OPACITY_TABLE0 is
the
> opacity (256 array) for every element of the RGB_TABLE0 color table.
> Then, for every color you can asign an opacity ("alpha channel").
>
> Bye.

Thanks. I met another problem as I first deal with 3D visulation. I can
show the data on the screen, but when I use OBJ_NEW('IDLgrClipboard')
to try to save it to a file as postscript, the eps file is just a dark
images. By the way, how to save the image as a jpeg file?

following is part of the code to draw and save the image.
;----------------------------

loadct,13
tvlct, r, g, b,/get
rgb=bytarr(256,3)
rgb(*,0)=r & rgb(*,1)=g & rgb(*,2)=b

myvolume = OBJ_NEW('IDLgrVolume', da)
cc=[-0.5,1.0/64.0]
myvolume->SetProperty,XCOORD_CONV=cc,YCOORD_CONV=cc,ZCOORD_CONV=cc
mywindow = OBJ_NEW('IDLgrWindow',DIMENSIONS=[400,400])
;mywindow = OBJ_NEW('IDLgrClipboard')

myview = OBJ_NEW('IDLgrView',VIEWPLANE_RECT=[-1,-1,2,2], $
ZCLIP=[2.0,-2.0],color=[50,50,50])
mymodel = OBJ_NEW('IDLgrModel')
myview->Add,mymodel
mymodel->Add,myvolume
mymodel->rotate,[1,1,1],20
opac = BYTARR(256)
opac[0:127] = BINDGEN(128)/8
myvolume->SetProperty,OPACITY_TABLE0=opac
myvolume->SetProperty,RGB_TABLE0=rgb
mywindow->Draw,myview
;mywindow->Draw,myview,VECTOR=1,POSTS=1,FILE='rgb.eps'
;mywindow->Draw,myview,VECTOR=0,POSTS=0,FILE='a.bmp'

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[Message index]

		3D VOLUME VISUALIZATION By: MC on Wed, 19 February 2003 20:51
		Re: 3D VOLUME VISUALIZATION By: Dick Jackson on Thu, 20 February 2003 08:34
		Re: 3D VOLUME VISUALIZATION By: idle on Tue, 28 December 2004 19:06
		Re: 3D VOLUME VISUALIZATION By: s[1] on Thu, 20 February 2003 08:25
		Re: 3D VOLUME VISUALIZATION By: idle on Mon, 03 January 2005 13:55
		Re: 3D VOLUME VISUALIZATION By: Karl Schultz on Mon, 03 January 2005 14:38
		Re: 3D VOLUME VISUALIZATION By: Antonio Santiago on Tue, 28 December 2004 23:22
		Re: 3D volume Visualization By: David Fanning on Sat, 23 November 2013 05:46
		Re: 3D volume Visualization By: markb77 on Mon, 02 December 2013 05:12
		Re: 3D volume Visualization By: amin farhang on Wed, 04 December 2013 16:17
		Re: 3D volume Visualization By: David Fanning on Wed, 04 December 2013 16:39

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