| Re: Draw a point in 3D graphic object ? [message #30273] |
Thu, 18 April 2002 06:27  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Xavier (xavier.presseq@cesbio.cnes.fr) writes:
> Since one month I use IDL, but I have a basic problem with object.
> I know how make Surface, Volume with a graphic object but I just want
> draw a point in 3D, and I don't know do this.
> I have try with IDLgrPolyline and IDLgrSymbol but, I must draw 5000
> points and rotate or move this object become very slow.
> It's faster for mouvement with IDLgrPolygone but my computer take 30s
> to build the object in memory before draw it.
I think you must be creating a LOT of polylines where one
will do. :-)
I just took my much disparaged FSC_SURFACE program and
replaced the line that creates the surface object with
these lines:
x = Randomu(seed, 5000) * 100
y = Randomu(seed, 5000) * 100
z = Randomu(seed, 5000) * 100
symbol = Obj_New('IDLgrSymbol', 2)
thisSurface = Obj_New('IDLgrPolyline', x, y, z, $
Linestyle=6, Symbol=symbol)
The polyline is created instantly, and the resulting
points rotate in 3D space more or less instantaneously
on my (by now) middle of the road computer.
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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