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Re: DIRECT GRAPHICS VS OBJECT GRAPHICS [message #29891 is a reply to message #29888]

Sun, 24 March 2002 13:42

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

"Mukunda P Raju" <mpraju@eecs.umich.edu> wrote in message
news:Pine.LNX.4.33.0203222353510.24048-100000@harvest.eecs.u mich.edu...

> Hello...im new to IDL and looking into a program which deals with
> some direct graphics...PLOTS etc...I need to convert this into
> object graphics so that i can write to a VRML file. Now...ive used
> the existing direct graphics code and written to a Z buffer and then
> wrote the resultant 2d array into a IDLgrPlot object and that into a
> Model and then into a View and then drew the view in a VRML
> object. Is this ok?

No. As I understand it, you've extracted a 2D image from the Z buffer,
loaded it into an IDLgrPlot object (thus creating a very strange
looking line plot) then rendered it to an IDLgrVRML object. This will
not work. You could load the 2D image into an IDLgrImage object and
render that. Then it might look more or less OK, but it would be a
flat representation of your scene. Sice you are going to the trouble
of using a 3D format, I doubt that this is what you want.

If you want 3D scene in an IDLgrVRML file, i"m afraid you'll have to
build it up out of Object Graphics commands. Object Graphics and
Direct Graphics are completely separate systems. The only way(*) to
pass information between them is to render the objects/commands in one
system to an image then load it into the other. This is seldom useful.

(*) OK there may be one or two other ways, left as an exercise for the
reader, but they're not very useful.

--
Mark Hadfield
m.hadfield@niwa.co.nz Ka puwaha et tai nei
http://katipo.niwa.co.nz/~hadfield Hoea tatou
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: DIRECT GRAPHICS VS OBJECT GRAPHICS By: Rick Towler on Sun, 24 March 2002 21:09
		Re: DIRECT GRAPHICS VS OBJECT GRAPHICS By: Mark Hadfield on Sun, 24 March 2002 13:42
		Re: DIRECT GRAPHICS VS OBJECT GRAPHICS By: Mukunda P Raju on Fri, 22 March 2002 23:18
		Re: DIRECT GRAPHICS VS OBJECT GRAPHICS By: David Fanning on Fri, 22 March 2002 22:23

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