What is significance of Camera.viewPlaneSize property ?

Question

Hi,What is significance of viewPlaneSize property defined on Camera object in Acrobat 3D ?http://help.adobe.com/livedocs/acrobat_sdk/9.1/Acrobat9_1_HTMLHelp/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Acrobat… Is it related to Zoom factor ? It changes when I apply the zoom in Adobe.How can we calculate its value programatically if we need to , say zoom in by factor of 2.Can anyone please explain this ?Thanks !Vinay

Anonymous · Answer

Some more information regarding my question above.....

Here is log data captured when I Zoom-in a given model in PDF,

Before Application of Camera changes

Camera position- World : Vector3: (-8.92503, 6.88368, 15.6271)

Camera target position- World : Vector3: (-0.422796, -0.0583679, 7.12486)

Camera up- World : Vector3: (353.553, 866.025, -353.553)

Camera projection : orthographic

Camera viewPlaneSize : 2.332579545054827

After Application of Camera changes

Camera position- World : Vector3: (-8.92503, 6.88368, 15.6271)

Camera target position- World : Vector3: (-0.422796, -0.0583679, 7.12486)

Camera up- World : Vector3: (353.553, 866.025, -353.553)

Camera projection : orthographic

Camera viewPlaneSize : 49.39319731696409

You can observe that Up,target and eye values remain same and only viewPlanSize is changed.

Is it some way related to near and far planes ?

Thanks !

Vinay

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