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Re: 3d device coordinates from a 3D polyline.... [message #81585 is a reply to message #81518]

Tue, 02 October 2012 14:32

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 10/2/12 3:02 PM, Karl wrote:
> It should also be possible to write a general-purpose function that
> takes a "leaf" graphics object and walks up the scene graph,
> computing the single 4x4 combined matrix and returns it. You would
> then use that single matrix to transform your points.
>
> In a way, you are duplicating the entire transform that IDL applies
> to the points via the underlying graphics system (OpenGL). I don't
> remember if there is a way to get this transform directly from IDL -
> don't think so. And someone out there may have already written an
> IDL function to do this. But, I don't know of any.

Isn't this the ::getCTM() method or am I misunderstanding the situation?

Mike
--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
Research Mathematician
Tech-X Corporation

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[Message index]

		3d device coordinates from a 3D polyline.... By: George.millward on Fri, 28 September 2012 14:30
		Re: 3d device coordinates from a 3D polyline.... By: George.millward on Thu, 04 October 2012 09:23
		Re: 3d device coordinates from a 3D polyline.... By: Karl[1] on Thu, 04 October 2012 13:16
		Re: 3d device coordinates from a 3D polyline.... By: Karl[1] on Wed, 03 October 2012 13:29
		Re: 3d device coordinates from a 3D polyline.... By: Michael Galloy on Wed, 03 October 2012 07:49
		Re: 3d device coordinates from a 3D polyline.... By: Michael Galloy on Tue, 02 October 2012 14:32
		Re: 3d device coordinates from a 3D polyline.... By: Karl[1] on Tue, 02 October 2012 14:02
		Re: 3d device coordinates from a 3D polyline.... By: George.millward on Tue, 02 October 2012 09:46
		Re: 3d device coordinates from a 3D polyline.... By: George.millward on Thu, 04 October 2012 13:21

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