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IGlobeCamera Interface (ArcObjects .NET 10.8 SDK)
ArcObjects Help for .NET developers > ArcObjects Help for .NET developers > ArcObjects namespaces > GlobeCore > ESRI.ArcGIS.GlobeCore > Interfaces > IG > IGlobeCamera Interface
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IGlobeCamera Interface

Provides access to members that manipulate global parameters of the camera.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Description

IGlobeCamera is used primarily to manipulate the globe camera or the perspective of a 3D globe display. It's implemented by the Camera associated with the active viewer in the globe display. Using this interface you can get/set the following properties: OrientationMode  - the navigation mode, surface or global. RollOffset offsets the roll angle. By default, RollOffset = 0. 

IGlobeCamera also has the following methods: GetTargetLatLonAlt and SetTargetLatLonAlt - target location where latitude and longitude are in decimal degrees and altitude is in kilometers. GetObserverLatLonAlt and SetObserverLatLonAlt -observer location where latitude and longitude are in decimal degrees and altitude is in kilometers. GetLocalOrientation - azimuth, inclination and roll angles relative to the current target on surface, when in surface navigation. GetAccurateViewDirection and SetAccurateViewDirection - high precision normalized view direction. While navigating, when the target is very near to the observer, this method helps in removing the imprecisions in the viewing direction vector, which cause jerkiness, by setting a unit vector in the viewing direction. GetFrustrumSkewRect and SetFrustrumSkewRect - can be used to display/export portions of the current globe view. By default, the values xmin (left) = 0, xmax (right) = 1, ymin (bottom) = 0, ymax (top) = 1, which represent the whole display or rectangular viewing frustum. For example, the viewing frustum parameters can be changed to only display the bottom left half by setting xmin = 0, xmax = 0.5, ymin = 0, and ymax = 0.5.  

Members

Name Description
Method GetAccurateViewDirection Get the high precision normalized view direction.
Method GetFrustumSkewRect Values are between 0 and 1 -- define the skew rectangle.
Method GetLocalOrientation Get the azimuth, inclination and roll angles relative to the current target on surface.
Method GetObserverLatLonAlt Set the observer location as a combination of latitude and longitude in decimal degrees plus altitude in kilometers.
Method GetTargetLatLonAlt Get the target location as a combination of latitude and longitude in decimal degrees plus altitude in kilometers.
Write-only property GlobeRadius A copy of the globe radius from the display.
Read/write property NavigationType The navigation type.
Read/write property OrientationMode The orientation mode.
Write-only property RollFactor The roll factor used to modulate animation transitions.
Read/write property RollOffset The offset for the roll angle in degrees.
Method SetAccurateViewDirection Set the high precision normalized view direction.
Method SetFrustumSkewRect Values are between 0 and 1 -- define the skew rectangle.
Method SetObserverLatLonAlt Set the observer location as a combination of latitude and longitude in decimal degrees plus altitude in kilometers.
Method SetTargetLatLonAlt Set the target location as a combination of latitude and longitude in decimal degrees plus altitude in kilometers.
Method SetToZoomToExtents Set the Camera to Zoom to an Extent.

Classes that implement IGlobeCamera

Classes Description
GlobeCamera The globe camera component.

Remarks

Note: IGlobeCamera cannot be used within multithreaded applications.

[C#]

The following code illustrates how to change the orientation mode of the globe camera from Surface to Global navigation mode and vice versa:

//Change Orientation mode from Local/Surface to Global.

private void SurfaceToGlobal()
{
 //pGlobe is a variable of type IGlobe
 IGlobeDisplay pGlbDisplay = pGlobe.GlobeDisplay;

 //get the ActiveViewer
 ISceneViewer pViewer = pGlbDisplay.ActiveViewer;
   
 //get the Camera of the current viewer
 ICamera pCamera = pViewer.Camera;

 //Set the GlobeCamera to the camera of the ActiveViewer
 IGlobeCamera pGlobeCamera = (IGlobeCamera)pCamera;

 //In order to change the orientation mode to Global, we have to set the
 //target of the camera of active viewer at the center of the earth.

 IPoint pTarget = new PointClass();
 pTarget.PutCoords(0,0);
 pTarget.Z = 0;
 pCamera.Target = pTarget;

 //Set the GlobeCamera to Global Navigation mode.
 pGlobeCamera.OrientationMode = esriGlobeCameraOrientationMode.esriGlobeCameraOrientationGlobal;

}


//Change Orientation mode from Global to Local/Surface

private void GlobalToSurface()
{
 //Get the GlobeCamera
 IGlobeCamera pGlobeCamera = GetGlobeCamera();

 //In order to change the orientation mode to Local/Surface, we have to set the
 //target of the globe camera on the surface of earth (Altitude = 0).
 pGlobeCamera.SetTargetLatLonAlt(45,93,0);

 // Set the GlobeCamera to Local/Surface Navigation mode
 pGlobeCamera.OrientationMode = esriGlobeCameraOrientationMode.esriGlobeCameraOrientationLocal;
}

.NET Samples

Effects in the GlobeControl Navigating around the GlobeControl 3D dynamic element tracking Globe Fly tool Multiple globe viewers Set sun position tool Visualizing the camera path while animating