| Re: Image plot on back wall [message #17951 is a reply to message #17932] |
Fri, 19 November 1999 00:00   |
m218003
Messages: 56
Registered: August 1999
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Member |
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In article <MPG.129e62a85186952598997c@news.frii.com>,
davidf@dfanning.com (David Fanning) writes:
> Well, after telling someone the other day,
> "Oh, it would be simple with object graphics.",
> I decided to see how simple it would be.
>
> Yikes!
>
> OK, must be a light problem. Add a light to the image.
> (Why didn't I think of this? Every picture in an
> art gallery has a light above the image to illuminate
> it. Stupid.) Whoops! Wrong kind of light. Add
> *ambient* light there, Jose.
>
> And so it goes. I'm looking for my slide rule right
> now so I can calculate the optimum distance and viewing
> angles for the lights in the scene. [...][/color]
OK. I guess, I see clearer now: it's not objects that I don't like, but
the applications that are built on objects! Just had a look at AVS the other
day: Maybe I'm already too old for this, but I just can't make ends of
something where you have to mouse and drag yourself along, select
rectangles with a 3D-look and inconclusive labels, paste them onto a
worksheet, connect them with wires, and hope that this will work.
Similarily: IDGgr... is far too much "real life oriented" for my sense.
Why should I have to call an electrician (or - worse - a professional light
engineer) just to put some scene on my screen. I always thought, the
virtue of a computer is that you can use it as a tool, and that it will
do *exactly* what you ask it to do. Nowadays it seems we have to *talk*
to these machines and *ask* them to *please* try to accomplish at least
a tiny fraction of what we had in mind.
Even though it might in the end produce a result which falls short of
one produced with IDLgr..., I much prefer to write
surface,data
instead of
virtual_world = obj_new("IDLgr...",/Grass_On_The_Bottom, $
/Mountains_On_The_Right,/Rivers_Below)
virtual_world -> SetProperty,River="blue and reflecting", $
Mountains="not too steep"
light = obj_new("IDLgr...",Time_Of_Year="January 1, 1999 AD", $
Sky="Some scattered Cumulus Clouds")
light -> SetProperty,MoonPhase="Full"
potential_surface_plot = obj_new("IDLgr...",world=virtual_world, $
light=light)
potential_surface_plot -> AddData, data
; In version 5.2.1, rivers don't look nice, so turn them off
potential_surface_plot -> SetProperty,/DoNotShowRiver
; The following feature is undocumented but prevents a crash
; for winter scenes
potential_surface_plot -> SetProperty,/DoNotCareAboutSnowCover
potential_surface_plot -> Please_Show_And_Pray_That_User_Doesnt_Change_Aspect
Ooops! Forgot to specify the density of air .... and my clouds don't
have 24 bit ...
But object graphics programs may win a Noble Price for literature one of these
days ;-)
Cheers,
Martin
--
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
[[ Dr. Martin Schultz Max-Planck-Institut fuer Meteorologie [[
[[ Bundesstr. 55, 20146 Hamburg [[
[[ phone: +49 40 41173-308 [[
[[ fax: +49 40 41173-298 [[
[[ martin.schultz@dkrz.de [[
[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[ [[[[[[[
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