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Re: Displaying 3-D vector fields [message #32823 is a reply to message #32726]

Thu, 14 November 2002 12:13

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

"Jim" <jim.blackwell@gsfc.nasa.gov> wrote

> what scales the size of the arrow (the length of the arrow relative to
> the shaft)?

The vector is scaled according to the sqrt() of the sum of the squares of
the components of the magnitude. The *entire* vector is scaled, head and
all since I am using the model's transformation matrix to do the work for
me. The vector is not drawn if the magnitude is 0.

> Is the default vector that is drawn of unit length ?

Yes, the default vector is 1 unit long. It's default magnitude is [0,0,-1]
which makes it parallel to the z axis pointing away from the viewer. It's
default location is [0,0,0].

-Rick

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[Message index]

		Displaying 3-D vector fields By: jim.blackwell on Wed, 06 November 2002 12:37
		Re: Displaying 3-D vector fields By: Rick Towler on Fri, 08 November 2002 11:31
		Re: Displaying 3-D vector fields By: jim.blackwell on Tue, 12 November 2002 11:20
		Re: Displaying 3-D vector fields By: James Kuyper on Fri, 08 November 2002 08:05
		Re: Displaying 3-D vector fields By: jim.blackwell on Fri, 08 November 2002 07:35
		Re: Displaying 3-D vector fields By: jim.blackwell on Fri, 08 November 2002 06:44
		Re: Displaying 3-D vector fields By: rmw092001 on Thu, 07 November 2002 23:38
		Re: Displaying 3-D vector fields By: Rick Towler on Thu, 07 November 2002 09:04
		Re: Displaying 3-D vector fields By: Mark Hadfield on Thu, 14 November 2002 12:52
		Re: Displaying 3-D vector fields By: Rick Towler on Thu, 14 November 2002 13:39
		Re: Displaying 3-D vector fields By: Rick Towler on Thu, 14 November 2002 12:13
		Re: Displaying 3-D vector fields By: jim.blackwell on Mon, 18 November 2002 08:43
		Re: Displaying 3-D vector fields By: Rick Towler on Thu, 14 November 2002 11:52
		Re: Displaying 3-D vector fields By: jim.blackwell on Thu, 14 November 2002 10:11
		Re: Displaying 3-D vector fields By: jim.blackwell on Thu, 14 November 2002 09:03
		Re: Displaying 3-D vector fields By: David Fanning on Thu, 14 November 2002 07:52
		Re: Displaying 3-D vector fields By: jim.blackwell on Thu, 14 November 2002 07:33
		Re: Displaying 3-D vector fields By: Rick Towler on Wed, 13 November 2002 09:20
		Re: Displaying 3-D vector fields By: jim.blackwell on Wed, 13 November 2002 07:06
		Re: Displaying 3-D vector fields By: Rick Towler on Tue, 12 November 2002 12:47
		Re: Displaying 3-D vector fields By: David Fanning on Thu, 14 November 2002 16:17
		Re: Displaying 3-D vector fields By: Mark Hadfield on Thu, 14 November 2002 15:47
		Re: Displaying 3-D vector fields By: jim.blackwell on Tue, 19 November 2002 06:48
		Re: Displaying 3-D vector fields By: Struan Gray on Tue, 19 November 2002 02:21
		Re: Displaying 3-D vector fields By: Rick Towler on Mon, 18 November 2002 11:54

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