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Re: 3d device coordinates from a 3D polyline.... [message #81571 is a reply to message #81518]

Wed, 03 October 2012 13:29

Karl[1]
Messages: 79
Registered: October 2005

Member

On Tuesday, October 2, 2012 3:32:02 PM UTC-6, Mike Galloy wrote:
> 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

yep, that's it.

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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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