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Re: Direct or object graphics [message #17159 is a reply to message #17099]

Wed, 15 September 1999 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Ben Tupper (tupper@seadas.bigelow.org) writes:

>> If it were me, I'd do it in direct graphics. The only
>> things that really seems to scream "object graphics" to
>> me are those things that require a 3D representation.
>
> I have been stewing over a similar object/direct graphics problem. I often
> need enable data picking from a 2d or 3d scatter plot. In the past I have
> accomplished 2d data picking in direct graphics; what a BEAR to wrestle
> with. It seems like OOG makes data picking easy. Should data picking be
> added to the things that 'scream'?

Yes, I think so. The only way to do 3D data picking
in direct graphics is to have a copy of the window
around in the Z-graphics buffer, where you *can* get
3D location information. As you say, it is a bear
to get it to work properly.

Since the object graphics system *is* a Z-graphics
buffer almost by definition, 3D data picking just
sort of falls out of it. Very easy.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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		Direct or object graphics By: Lazzar on Sun, 12 September 1999 00:00
		Re: Direct or object graphics By: davidf on Wed, 15 September 1999 00:00
		Re: Direct or object graphics By: Ben Tupper on Wed, 15 September 1999 00:00

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