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Re: Z-Buffer [message #8175 is a reply to message #6727]

Wed, 12 February 1997 00:00

J.D. Smith
Messages: 214
Registered: August 1996

Senior Member

G.M.Sigut wrote:
>

> The following might be a (beginning of a) solution:
>
> I took the example "as is", added some test data generation, made it
> work and then commented. I doubled the example to have two drawings
> under each other, which is (I presume) the goal. I did NOT try to
> make the whole thing look nice, but just made it work. The original
> text starts with an offset, practically all my additions start in

That solution did the trick! I modified it slightly however -- instead
of forcing the PS page to conform to the dimensions of the Z-buffer, I
set the resolution of the z-buffer to conform to the ratio of my output
page.

The key to the solution was, however, that, inside the z-buffer, my
plotting routine obeyed to !P.POSITION variable, since it used
shade_surf only. This is a fine solution to this problem (and I wish I
had thought of it), but it doesn't address the following larger issue:
suppose what you needed to put into postscript was *actually* generated
from some image command, and not a plotting command. For a specific
example, suppose you had a galaxy survey with three dimension ( ra, dec,
and redshift) as an image, and you wanted to overlay axes. Getting the
axes registered to the image is difficult, it seems to me, because of
this dichotomy between plot and image positioning paradigms. But maybe
I'm just missing something obvious. Anyway, some food for thought.

Thanks for the help,

JD

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[Message index]

		z-buffer By: sjang on Mon, 05 August 1996 00:00
		Re: Z-Buffer By: sigut on Thu, 13 February 1997 00:00
		Re: Z-Buffer By: J.D. Smith on Wed, 12 February 1997 00:00
		Re: Z-Buffer By: sigut on Wed, 12 February 1997 00:00
		Re: Z-Buffer By: Robert.M.Candey on Tue, 11 February 1997 00:00
		Re: Z-Buffer By: davidf on Tue, 11 February 1997 00:00
		Re: Z-Buffer By: savoie on Tue, 11 February 1997 00:00
		Re: Z-Buffer By: davidf on Mon, 10 February 1997 00:00
		Re: Z-Buffer By: davidf on Wed, 27 October 1999 00:00

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