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From: blatt@mugwort.Eng.Sun.COM (Alan Greenblatt)
Newsgroups: comp.graphics
Subject: Re: SunPHIGS's pcellarray
Summary: The image gdp should server your purpose
Message-ID: <14151@exodus.Eng.Sun.COM>
Date: 29 May 91 18:17:22 GMT
References: <1991May20.203703.24007@philabs.philips.com>
Sender: news@exodus.Eng.Sun.COM
Distribution: usa
Organization: Sun Microsystems, Mt. View, Ca.
Lines: 37

In article <1991May20.203703.24007@philabs.philips.com> kkt@philabs.philips.com (Kim-Kiat Tan) writes:
>	I am trying to display a 2d image using cellarray, however, what I get
>	is the outline drawn around my 2d array (i.e. you see a rectangle), 
>	and according to sun's documentation, it stated that SunPHIGS 
>	supports the minimal allowed simulation for the CELL ARRAY primitive 
>	by drawing the transformmed boundaries of the cell array, does it 
>	mean that there is no way to display image with cell array ?

Correct.

>	I tried to use the GDP (procedure pgdp3) to display 3d volume, but 
>	there is no input parameters for z-dim, so how on earth the procedure 
>	is going to know the dimension in z ?
>	Hope someone on the net will have the answer for me.
>	Thanks.

Are you trying to display a 2D image or a 3D volume?  If you are trying to
display a 3D volume, you'll have to break it up into surfaces that SunPHIGS
will recognize.  However, if you are indeed trying to render a 2D image,
use GDP -14, the image gdp.  The reason it doesn't have any input parameters
for the z dimension is because it is an image, not a volume.  The GDP does
however take as input a reference point (for the 3D GDP version this is a 
3D point) which locates the image in model coordinates. The image will be
drawn so that its lower left corner is at this point.  The image is drawn as
a raster array: each cell of the image is drawn as a pixel on the screen, and
so the image can not be rotated, scaled or skewed in way. 

If you need a to rotate or scale your image, using polylines or a quad mesh
may work better.


- Alan
--
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Alan Greenblatt                         "I'm not arguing that with you.
Anyware Fast, Inc.                       Did I say that?  If I said that,
alan.greenblatt@Eng.Sun.com              I'd be lying."  - Joe vs. the Volcano