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SoGeoLOD Class

Level-of-detail management for multi-resolution terrains.

Inheritance Hierarchy

Namespace: OIV.Inventor.Geo
Assembly: OIV.Inventor (in OIV.Inventor.dll) Version: 10.12.3.0 (10.12.3.0)
Syntax
public class SoGeoLOD : SoGroup

The SoGeoLOD type exposes the following members.

Constructors
  NameDescription
Public methodSoGeoLOD

Constructor.

Public methodSoGeoLOD(Int32)

Constructor that takes approximate number of children.

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Methods
  NameDescription
Public methodAddChild

Adds a child as last one in group.

(Inherited from SoGroup.)
Public methodAffectsState

Returns true if a node has an effect on the state during traversal.

(Inherited from SoNode.)
Public methodCallback
Public methodCopy
Calls Copy(false).
(Inherited from SoNode.)
Public methodCopy(Boolean)

Creates and returns an exact copy of the node.

(Inherited from SoNode.)
Public methodCopyFieldValues(SoFieldContainer)
Calls CopyFieldValues(fc, false).
(Inherited from SoFieldContainer.)
Public methodCopyFieldValues(SoFieldContainer, Boolean)

Copies the contents of fc's fields into this object's fields.

(Inherited from SoFieldContainer.)
Public methodDispose
Releases all resources used by SoDisposable.
(Inherited from SoDisposable.)
Public methodDistribute
(Inherited from SoNode.)
Public methodDoAction
Public methodEnableNotify

Notification at this Field Container is enabled (if flag == true) or disabled (if flag == false).

(Inherited from SoFieldContainer.)
Public methodEquals
Determines whether the specified Object is equal to the current Object.
(Inherited from Object.)
Public methodFieldsAreEqual

Returns true if this object's fields are exactly equal to fc's fields.

(Inherited from SoFieldContainer.)
Public methodFindChild

Finds index of given child within group.

(Inherited from SoGroup.)
Public methodGet

Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.

(Inherited from SoFieldContainer.)
Public methodGetAllFields

Returns a list of fields, including the eventIn's and eventOut's.

(Inherited from SoFieldContainer.)
Public methodGetAlternateRep

This method is called by actions to allow the node to provide an "alternate representation" when appropriate (typically depending on the action type).

(Inherited from SoNode.)
Public methodGetBoundingBox
Public methodGetChild

Returns pointer the child node with the given index.

(Inherited from SoGroup.)
Public methodGetEventIn

Returns a the eventIn with the given name.

(Inherited from SoFieldContainer.)
Public methodGetEventOut

Returns the eventOut with the given name.

(Inherited from SoFieldContainer.)
Public methodGetField

Returns a the field of this object whose name is fieldName.

(Inherited from SoFieldContainer.)
Public methodGetFieldName

Returns the name of the given field in the fieldName argument.

(Inherited from SoFieldContainer.)
Public methodGetFields

Appends references to all of this object's fields to resultList, and returns the number of fields appended.

(Inherited from SoFieldContainer.)
Public methodGetHashCode
Overrides GetHashCode().
(Inherited from SoNetBase.)
Public methodGetMatrix
(Inherited from SoGroup.)
Public methodGetName

Returns the name of an instance.

(Inherited from SoBase.)
Public methodGetNumChildren

Returns number of children.

(Inherited from SoGroup.)
Public methodGetPrimitiveCount
Public methodGetRenderEngineMode

Returns the supported Render engine mode.

(Inherited from SoNode.)
Public methodGetRenderUnitID
(Inherited from SoNode.)
Public methodGetStringName (Inherited from SoBase.)
Public methodGetType
Gets the Type of the current instance.
(Inherited from Object.)
Public methodGLRender
Public methodGLRenderBelowPath
(Inherited from SoNode.)
Public methodGLRenderInPath
(Inherited from SoNode.)
Public methodGLRenderOffPath
(Inherited from SoNode.)
Public methodGrabEventsCleanup
(Inherited from SoNode.)
Public methodGrabEventsSetup
(Inherited from SoNode.)
Public methodHandleEvent
(Inherited from SoGroup.)
Public methodHasDefaultValues

Returns true if all of the object's fields have their default values.

(Inherited from SoFieldContainer.)
Public methodInsertChild

Adds a child so that it becomes the one with the given index.

(Inherited from SoGroup.)
Public methodIsBoundingBoxIgnoring

Used by BoundingBoxAction to known if bounding box computation should be ignored or not.

(Inherited from SoGroup.)
Public methodIsNotifyEnabled

Notification is the process of telling interested objects that this object has changed.

(Inherited from SoFieldContainer.)
Public methodIsOverride

Returns the state of the override flag.

(Inherited from SoNode.)
Public methodIsSynchronizable

Gets the ScaleViz synchronizable state of this object.

(Inherited from SoBase.)
Public methodPick
(Inherited from SoGroup.)
Public methodRayPick
Public methodRemoveAllChildren

Removes all children from group.

(Inherited from SoGroup.)
Public methodRemoveChild(Int32)

Removes child with given index from group.

(Inherited from SoGroup.)
Public methodRemoveChild(SoNode)

Removes first instance of given child from group.

(Inherited from SoGroup.)
Public methodReplaceChild(Int32, SoNode)

Replaces child with given index with new child.

(Inherited from SoGroup.)
Public methodReplaceChild(SoNode, SoNode)

Replaces first instance of given child with new child.

(Inherited from SoGroup.)
Public methodSearch
(Inherited from SoGroup.)
Public methodSet

Sets one or more fields in this object to the values specified in the given string, which should be a string in the Open Inventor file format.

(Inherited from SoFieldContainer.)
Public methodSetName (Inherited from SoBase.)
Public methodSetOverride

Turns the override flag on or off.

(Inherited from SoNode.)
Public methodSetSynchronizable

Sets this to be a ScaleViz synchronizable object.

(Inherited from SoBase.)
Public methodSetToDefaults

Sets all fields in this object to their default values.

(Inherited from SoFieldContainer.)
Public methodToString
Converts this SoBase structure to a human readable string.
(Inherited from SoBase.)
Public methodTouch

Marks an instance as modified, simulating a change to it.

(Inherited from SoNode.)
Public methodWrite
(Inherited from SoGroup.)
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Properties
  NameDescription
Public propertyboundingBoxIgnoring

Whether to ignore this node during bounding box traversal.

(Inherited from SoGroup.)
Public propertycenter

Object-space center of the model.

Public propertychild1Url

First child url : bottom-left quadtree child.

Public propertychild2Url

Second child url : up-left quadtree child.

Public propertychild3Url

Third child url : up-right quadtree child.

Public propertychild4Url

Fourth child url : bottom-right quadtree child.

Public propertygeoSystem

Defines the spatial reference frame.

Public propertyIsDisposable
ISafeDisposable interface implementation.
(Inherited from SoDisposable.)
Public propertyrange

World-space distance to use as switching criteria.

Public propertyrootUrl

Url of the file that contains the root tile geometry.

Public propertyUserData
Gets or sets the user data to be contained by the field container.
(Inherited from SoFieldContainer.)
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Remarks

The OIV.Inventor.Geo.SoGeoLOD node allows applications to build massive tiled, multi-resolution terrain models where the viewer progressively loads higher resolution detail as you fly into the terrain.

The OIV.Inventor.Geo.SoGeoLOD node provides a terrain-specialized form of the LOD node. It is a grouping node that specifies two different levels of detail for an object using a tree structure, where 0 to 4 children can be specified, and also efficiently manages the loading and unloading of these levels of detail. The level of detail is switched depending upon whether the user is closer or further than OIV.Inventor.Geo.SoGeoLOD.range meters from the geospatial coordinate OIV.Inventor.Geo.SoGeoLOD.center. The OIV.Inventor.Geo.SoGeoLOD.center field should be specified as described in 25.2.4 Specifying geospatial coordinates. The OIV.Inventor.Geo.SoGeoLOD.geoSystem field is used to define the spatial reference frame and is described in 25.2.3 Specifying a spatial reference frame. When the user is outside the specified range, only the geometry for OIV.Inventor.Geo.SoGeoLOD.rootUrl or rootNode are displayed. When the viewer enters the specified range, this geometry is replaced with the contents of the four children files defined by OIV.Inventor.Geo.SoGeoLOD.child1Url through OIV.Inventor.Geo.SoGeoLOD.child4Url. The four children files are loaded into memory only when the user is within the specified range. Similarly, these are unloaded from memory when the user leaves this range. Figure below illustrates this process. The child URLs shall be arranged in the same order as in the figure; i.e., OIV.Inventor.Geo.SoGeoLOD.child1Url represents the bottom-left quadtree child. It is valid to specify less than four child URLs; in which case, the OIV.Inventor.Geo.SoGeoLOD should switch to the children nodes when all of the specified URLs have been loaded. This latter feature can support tree structures other than quadtrees, such as binary trees.

The OIV.Inventor.Geo.SoGeoLOD.rootUrl and rootNode fields provide two different ways to specify the geometry of the root tile. You may use one or the other. The rootNode field lets you include the geometry for the root tile directly within the file; whereas the OIV.Inventor.Geo.SoGeoLOD.rootUrl field lets you specify a URL for a file that contains the geometry. The result of specifying a value for both of these fields is undefined.

FILE FORMAT/DEFAULT

GeoLOD {
center 0 0 0
child1Url []
child2Url []
child3Url []
child4Url []
geoSystem ["GD","WE"]
range 10
rootUrl []
}

ACTION BEHAVIOR

OIV.Inventor.Actions.SoGLRenderAction, OIV.Inventor.Actions.SoCallbackAction, OIV.Inventor.Actions.SoGetBoundingBoxAction, OIV.Inventor.Actions.SoRayPickAction, OIV.Inventor.Actions.SoGetPrimitiveCountAction

See Also