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Re: 3d sphere revisited [message #33461 is a reply to message #33460]

Mon, 30 December 2002 10:28

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

"paul wisehart" <paul_wisehart@ssaihq.com> wrote

> Should/Can I be plot data to the sphere directly?

To continue David's thought the sphere *is* the data so I suppose you are
already doing this ;)

> OR, should i just plot the data to the texture image
> and then re-apply the texture?

I see three ways of presenting information with your sphere:

Modifying the sphere verticies. An example would be adding relief to your
sphere to depict the variations in elevation of a planet. There is an
example of this in the "What's new in 5.5" .pdf.

"Overplotting" the sphere. Create additional IDLgrPolyon or IDLgrPolyline
objects with verticies whose radius values are slightly larger than your
sphere such that they appear to float on the surface of the sphere. An
example would be creating an IDLgrPolygon object of the continents. You
could add IDLgrPolyline objects representing rivers, roads, borders.... Use
shape and .dxf files to get this data into IDL.

Texturing. The more textures the merrier. You can add layer after layer of
data by taking a series of bitmaps and combining them into a single texture.
There are many ways you can combine the data but a place to start would be
with the blending function used by IDLgrImage (see help on
IDLgrImage::Init).

Determining the mix of approaches will depend on what you have and want to
say.

-Rick

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[Message index]

		Re: 3d sphere revisited By: Rick Towler on Tue, 31 December 2002 09:39
		Re: 3d sphere revisited By: paul wisehart on Tue, 31 December 2002 06:36
		Re: 3d sphere revisited By: Rick Towler on Mon, 30 December 2002 10:28
		Re: 3d sphere revisited By: David Fanning on Mon, 30 December 2002 09:32

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