3D Picture Control Orthographic View zoom - Camera Set up?

I am trying to display two 3D picture controls. One displays some objects in 3D (Auto Projection: Perspective, Camera Controller: Spherical). This 3D image works great and I am having no problems with it. The other Picture Contol is meant to simulate a 2D image of the 3D object, essentially a Plan View. To do this I made a 3D picture control with a Orthographic view. I set the camera to view from above (z-axis) and set the target to be positive y-axis.
I have attached an example vi (labview 2013 SP1) that creates some simple 3D objects and displays them in Perspective and Orthographic using the same Camera Position. On initial start, the Orthographic image is zoomed in heavily. If I manually zoom it (Hold Shift button and mouse up or down), then the Orthographic image will set itself to the correct Camera position. This is essentially the solution to my problem, but I can't assume the user will have the ability to manually zoom the image. So I need to set it programmatically.
If you manual adjust the view on either screen (rotate and zoom), then click the Set Camera button, both images will give a plan view, but only the Perspective Image will be at the correct camera zoom or distance. The Orthographic stays at the last zoom distance.
Is there any way to set the Camera distance for Orthographic projection programmatically? I have tried starting with the 3D picture control as perspective, set the camera distance and then changing it to orthographic, but this still results in a zoomed orthographic image. From the reading I have done, I think I am trying to the impossible. Does any one have another suggestion to get the same result. I have previously used the 2D picture functions to generate the image but found that method inefficient.
And suggestions would be great.
Thanks
Relec
Attachments:
3D_projection_Test.vi ‏38 KB

Hi Relec,
thank you (and Kudos) for that inspiring demo!
Took me while to work it out, but I might have found something that could help us with the orthographic projection.
Sometime back someone posted a way to collect the current Camera data. Sorry I lost the source. But here is my version as a Get3DCameraPosition.vi using the ModelViewMatrix.
Unfortunatly this doesn't return the current Target and so a bit of guessing in the right Direction is necessary.
I'm impressed you found a way to make the Shift-Drag Zoom-movement possible on the orthographic window.
It seems a whole thread at http://forums.ni.com/t5/LabVIEW/3D-Picture-Control-Doesn-t-Zoom-in-Orthographic-Mode/td-p/1544460/page/2 wasn't able to find that out.
In the meantime I've found a way using the ProjectionMatrix to create a zoom-effect which I build into your demo using the mouse wheel.
All in all I've tried to translate camera movements from the perspective window in the ortho - assuming this is what you were after?!
Again the missing target information doesn't make it quite right.
Regs
Jannis

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Untitled 1.llb ‏67 KB

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