The SoGeoOrigin class is used to specify an absolute geographic location against which geometry is referenced. More...

#include <Inventor/nodes/SoGeoOrigin.h>

Inheritance diagram for SoGeoOrigin:

Public Member Functions
virtual SoType	getTypeId (void) const

	SoGeoOrigin (void)

virtual void	doAction (SoAction *action)

virtual void	callback (SoCallbackAction *action)

virtual void	GLRender (SoGLRenderAction *action)

virtual void	getBoundingBox (SoGetBoundingBoxAction *action)

virtual void	getMatrix (SoGetMatrixAction *action)

virtual void	pick (SoPickAction *action)

virtual void	getPrimitiveCount (SoGetPrimitiveCountAction *action)

Public Member Functions inherited from SoNode
void	setOverride (const SbBool state)

SbBool	isOverride (void) const

void	setNodeType (const NodeType type)

NodeType	getNodeType (void) const

virtual SoNode *	copy (SbBool copyconnections=FALSE) const

virtual SbBool	affectsState (void) const

virtual void	GLRenderBelowPath (SoGLRenderAction *action)

virtual void	GLRenderInPath (SoGLRenderAction *action)

virtual void	GLRenderOffPath (SoGLRenderAction *action)

virtual void	handleEvent (SoHandleEventAction *action)

virtual void	rayPick (SoRayPickAction *action)

virtual void	search (SoSearchAction *action)

virtual void	write (SoWriteAction *action)

virtual void	audioRender (SoAudioRenderAction *action)

virtual void	grabEventsSetup (void)

virtual void	grabEventsCleanup (void)

virtual void	startNotify (void)

virtual void	notify (SoNotList *l)

SbUniqueId	getNodeId (void) const

virtual SoChildList *	getChildren (void) const

virtual void	writeInstance (SoOutput *out)

virtual SoNode *	addToCopyDict (void) const

virtual void	copyContents (const SoFieldContainer *from, SbBool copyconnections)

virtual SoFieldContainer *	copyThroughConnection (void) const

Public Member Functions inherited from SoFieldContainer
void	setToDefaults (void)

SbBool	hasDefaultValues (void) const

SbBool	fieldsAreEqual (const SoFieldContainer *container) const

void	copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)

SbBool	set (const char *const fielddata)

void	get (SbString &fielddata)

virtual int	getFields (SoFieldList &l) const

virtual int	getAllFields (SoFieldList &l) const

virtual SoField *	getField (const SbName &name) const

virtual SoField *	getEventIn (const SbName &name) const

virtual SoField *	getEventOut (const SbName &name) const

SbBool	getFieldName (const SoField *const field, SbName &name) const

SbBool	enableNotify (const SbBool flag)

SbBool	isNotifyEnabled (void) const

SbBool	set (const char fielddata, SoInput input)

void	get (SbString &fielddata, SoOutput *out)

virtual SbBool	validateNewFieldValue (SoField field, void newval)

virtual void	addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)

SbBool	getIsBuiltIn (void) const

virtual void	getFieldsMemorySize (size_t &managed, size_t &unmanaged) const

void	setUserData (void *userdata) const

void *	getUserData (void) const

Public Member Functions inherited from SoBase
void	ref (void) const

void	unref (void) const

void	unrefNoDelete (void) const

int32_t	getRefCount (void) const

void	touch (void)

SbBool	isOfType (SoType type) const
	Returns `TRUE` if the type of this object is either of the same type or inherited from type. More...

virtual SbName	getName (void) const

virtual void	setName (const SbName &newname)

void	addAuditor (void *const auditor, const SoNotRec::Type type)

void	removeAuditor (void *const auditor, const SoNotRec::Type type)

const SoAuditorList &	getAuditors (void) const

SbBool	shouldWrite (void)

void	assertAlive (void) const

Static Public Member Functions
static SoType	getClassTypeId (void)

static void	initClass (void)

Static Public Member Functions inherited from SoNode
static uint32_t	getCompatibilityTypes (const SoType &nodetype)

static SoType	getClassTypeId (void)

static SoNode *	getByName (const SbName &name)

static int	getByName (const SbName &name, SoNodeList &l)

static void	initClass (void)

static void	initClasses (void)

static SbUniqueId	getNextNodeId (void)

static int	getActionMethodIndex (const SoType type)

static void	getBoundingBoxS (SoAction action, SoNode node)

static void	GLRenderS (SoAction action, SoNode node)

static void	callbackS (SoAction action, SoNode node)

static void	getMatrixS (SoAction action, SoNode node)

static void	handleEventS (SoAction action, SoNode node)

static void	pickS (SoAction action, SoNode node)

static void	rayPickS (SoAction action, SoNode node)

static void	searchS (SoAction action, SoNode node)

static void	writeS (SoAction action, SoNode node)

static void	audioRenderS (SoAction action, SoNode node)

static void	getPrimitiveCountS (SoAction action, SoNode node)

Static Public Member Functions inherited from SoFieldContainer
static void	initClass (void)

static SoType	getClassTypeId (void)

static void	cleanupClass (void)

static void	initCopyDict (void)

static void	addCopy (const SoFieldContainer orig, const SoFieldContainer copy)

static SoFieldContainer *	checkCopy (const SoFieldContainer *orig)

static SoFieldContainer *	findCopy (const SoFieldContainer *orig, const SbBool copyconnections)

static void	copyDone (void)

Static Public Member Functions inherited from SoBase
static void	initClass (void)
	Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

static SoType	getClassTypeId (void)
	This static method returns the SoType object associated with objects of this class.

static void	addName (SoBase const base, const char const name)

static void	removeName (SoBase const base, const char const name)

static void	incrementCurrentWriteCounter (void)

static void	decrementCurrentWriteCounter (void)

static SoBase *	getNamedBase (const SbName &name, SoType type)

static int	getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)

static SbBool	read (SoInput input, SoBase &base, SoType expectedtype)

static void	setInstancePrefix (const SbString &c)

static void	setTraceRefs (SbBool trace)

static SbBool	getTraceRefs (void)

static SbBool	connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)

static SbBool	readRoute (SoInput *input)

Public Attributes
SoSFVec3d	geoCoords

SoMFString	geoSystem

Protected Member Functions
virtual const SoFieldData *	getFieldData (void) const

virtual	~SoGeoOrigin ()

Protected Member Functions inherited from SoNode
	SoNode (void)

virtual	~SoNode ()

virtual SbBool	readInstance (SoInput *in, unsigned short flags)

Protected Member Functions inherited from SoFieldContainer
	SoFieldContainer (void)

virtual	~SoFieldContainer ()

Protected Member Functions inherited from SoBase
	SoBase (void)

virtual	~SoBase ()

virtual void	destroy (void)

SbBool	hasMultipleWriteRefs (void) const

SbBool	writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const

void	writeFooter (SoOutput *out) const

virtual const char *	getFileFormatName (void) const

virtual SoNotRec	createNotRec (void)

Static Protected Member Functions
static const SoFieldData **	getFieldDataPtr (void)

Static Protected Member Functions inherited from SoNode
static const SoFieldData **	getFieldDataPtr (void)

static void	setNextActionMethodIndex (int index)

static int	getNextActionMethodIndex (void)

static void	incNextActionMethodIndex (void)

static void	setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)

Static Protected Member Functions inherited from SoBase
static uint32_t	getCurrentWriteCounter (void)

static void	staticDataLock (void)

static void	staticDataUnlock (void)

Additional Inherited Members
Public Types inherited from SoNode
enum	NodeType { INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002, INVENTOR_1 = 0x0004, INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010, INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040, COIN_1_0 = 0x0080, COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400, COIN_2_3 = 0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000, COIN_3_0 = 0x8000, INVENTOR_6_0 = 0x10000, COIN_4_0 = 0x20000 }

Protected Types inherited from SoBase
enum	BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }

Protected Attributes inherited from SoNode
SbUniqueId	uniqueId

Protected Attributes inherited from SoFieldContainer
SbBool	isBuiltIn

Static Protected Attributes inherited from SoNode
static SbUniqueId	nextUniqueId = 1

static int	nextActionMethodIndex = 0

Detailed Description

The SoGeoOrigin class is used to specify an absolute geographic location against which geometry is referenced.

FILE FORMAT/DEFAULTS:

GeoOrigin {
  geoSystem ["GD", "WE"]
  geoCoords 0 0 0
}

A common problem when dealing with geographic data is the reduced floating point precision you often get. UTM coordinates are often in the 10^5 a 10^6 magnitude, and this leaves very little precision for details at that position.

The SoGeo nodes are therefore useful when you want to keep your data in its original system, but still get good floating point precision when rendering.

Coin needs a local Cartesian coordinate system when rendering. When a SoGeoOrigin node is used, Coin will create a coordinate system at the SoGeoOrigin position, and all geometry (and the camera) in the scene graph will be projected into that coordinate system.

The coordinate system will always have the Z-axis point up from the ground. The Y-axis will point towards the north pole, and the X-axis is found using the right hand rule.

A scene graph should only contain one GeoOrigin node, and all geometry in the scene graph will, as stated earlier, be rendered relative to this position. This means that the precision will be best if the GeoOrigin position is as close to actual camera position as possible. If you move around on a large area, it might therefore be a good idea too actually move the GeoOrigin position instead of the camera.

To place geometry in the scene graph, you can either use an SoGeoSeparator node or an SoGeoCoordinate node. When using a GeoSeparator node, all geometry inside that separator will be rendered relative to its geo-system position and orientation, and you then use regular shapes and regular SoCoordinate3 nodes to specify data (the points in an SoCoordinate3 must be adjusted to be relative to the GeoSeparator position).

The SoGeoCoordinate node on the other hand can contain double precision geo-coordinates, and that node will internally recalculate the double precision array to a single precision array which is relative to the SoGeoOrgin node.

One note regarding UTM projections: Since it is quite common to assume a flat earth when working with UTM data, it is possible to supply a "FLAT" keyword for UTM coordinate systems:

GeoOrigin {
  geoSystem [ "UTM", "Z17", "FLAT" ]
  geoCoords  846889 4313850 0
}

Example scene graph:

GeoOrigin { geoSystem "GD" geoCoords 40.77 -73.97 0 }
GeoSeparator {
  # New York, NY
  geoSystem  "GD"
  geoCoords 40.67 -73.94 0
  BaseColor { rgb 0 1 0 }
  Cube { width 25000 height 25000 depth 25000 }
  Translation { translation 0 0 30000 }
  Text2 { string "New York" }
}
GeoSeparator {
  # Los Angeles, CA
  geoSystem "GD"
  geoCoords 34.11 -118.4 0
  BaseColor { rgb 1 0 0 }
  Cube { width 25000 height 25000 depth 25000 }
  Translation { translation 0 0 30000 }
  Text2 { string "Los Angeles" }
}
GeoSeparator {
  # Washington, DC
  geoSystem [ "UTM", "Z17" ]
  geoCoords  846889 4313850 0
  BaseColor { rgb 0 1 1 }
  Cube { width 25000 height 25000 depth 25000 }
  Translation { translation 0 0 30000 }
  Text2 { string "Washington" }    
}
# add a small geogrid
GeoCoordinate {
  geoSystem "GD"
  point [
  32 -120 0,
  32 -110 0,
  32 -100 0,
  32 -90 0,
  32 -80 0,
  32 -70 0,
  34 -120 0,
  34 -110 0,
  34 -100 0,
  34 -90 0,
  34 -80 0,
  34 -70 0,
  36 -120 0,
  36 -110 0,
  36 -100 0,
  36 -90 0,
  36 -80 0,
  36 -70 0,
  38 -120 0,
  38 -110 0,
  38 -100 0,
  38 -90 0,
  38 -80 0,
  38 -70 0,
  40 -120 0,
  40 -110 0,
  40 -100 0,
  40 -90 0,
  40 -80 0,
  40 -70 0
  42 -120 0,
  42 -110 0,
  42 -100 0,
  42 -90 0,
  42 -80 0,
  42 -70 0
  ]
}
DrawStyle { style LINES }
BaseColor {}
ShapeHints { vertexOrdering COUNTERCLOCKWISE }
QuadMesh { verticesPerRow 6 verticesPerColumn 6 }

Since: Coin 2.5

Constructor & Destructor Documentation

◆ SoGeoOrigin()

SoGeoOrigin::SoGeoOrigin ( void )

Constructor.

◆ ~SoGeoOrigin()

SoGeoOrigin::~SoGeoOrigin ( )

protectedvirtual

Destructor.

Member Function Documentation

◆ getClassTypeId()

SoType SoGeoOrigin::getClassTypeId ( void )

static

This static method returns the SoType object associated with objects of this class.

◆ getTypeId()

SoType SoGeoOrigin::getTypeId ( void ) const

virtual

Returns the type identification of an object derived from a class inheriting SoBase. This is used for runtime type checking and "downward" casting.

Implements SoBase.

◆ getFieldDataPtr()

const SoFieldData ** SoGeoOrigin::getFieldDataPtr ( void )

staticprotected

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Returns the SoFieldData class which holds information about fields in this node.

◆ getFieldData()

const SoFieldData * SoGeoOrigin::getFieldData ( void ) const

protectedvirtual

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoFieldContainer.

◆ initClass()

void SoGeoOrigin::initClass ( void )

static

Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

◆ doAction()

void SoGeoOrigin::doAction ( SoAction * action )

virtual

This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

◆ callback()

void SoGeoOrigin::callback ( SoCallbackAction * action )

virtual

Action method for SoCallbackAction.

Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph.

Reimplemented from SoNode.

◆ GLRender()

void SoGeoOrigin::GLRender ( SoGLRenderAction * action )

virtual

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or want to throw geometry primitives at OpenGL override this method.

Reimplemented from SoNode.

◆ getBoundingBox()

void SoGeoOrigin::getBoundingBox ( SoGetBoundingBoxAction * action )

virtual

Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

Nodes influencing how geometry nodes calculate their bounding box also override this method to change the relevant state variables.

Reimplemented from SoNode.

◆ getMatrix()

void SoGeoOrigin::getMatrix ( SoGetMatrixAction * action )

virtual

Action method for SoGetMatrixAction.

Updates action by accumulating with the transformation matrix of this node (if any).

Reimplemented from SoNode.

◆ pick()

void SoGeoOrigin::pick ( SoPickAction * action )

virtual

Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

◆ getPrimitiveCount()

void SoGeoOrigin::getPrimitiveCount ( SoGetPrimitiveCountAction * action )

virtual

Action method for the SoGetPrimitiveCountAction.

Calculates the number of triangle, line segment and point primitives for the node and adds these to the counters of the action.

Nodes influencing how geometry nodes calculate their primitive count also override this method to change the relevant state variables.

Reimplemented from SoNode.

Member Data Documentation

◆ geoCoords

SoSFVec3d SoGeoOrigin::geoCoords

Used for specifying the geographic coordinates. For the GD system this should be <latitude> <longitude> <elevation>. For UTM it is <easting> <northing> <elevation>, and for GC it is simply <x> <y> <z>.

◆ geoSystem

SoMFString SoGeoOrigin::geoSystem

Used to specify a spatial reference frame. Coin currently supports three different systems. Support for more systems might be added in the future.

"GD" - The Geodetic system (latitude/longitude).
"UTM" - Universal Transverse Mercator coordinate system. The second string should be the zone, encoded as "Z<n>".

"GC" - Earth-fixed Geocentric with respect to the WGS84 ellipsoid.

The "GD" and "UTM" systems can, for future support, have an ellipsoid specification. The default is "WE" which is the WGS84 ellipsoid, the only ellipsoid currently supported in Coin.

The documentation for this class was generated from the following files:

SoGeoOrigin.h
SoGeoOrigin.cpp

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Static Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ SoGeoOrigin()

◆ ~SoGeoOrigin()

Member Function Documentation

◆ getClassTypeId()

◆ getTypeId()

◆ getFieldDataPtr()

◆ getFieldData()

◆ initClass()

◆ doAction()

◆ callback()

◆ GLRender()

◆ getBoundingBox()

◆ getMatrix()

◆ pick()

◆ getPrimitiveCount()

Member Data Documentation

◆ geoCoords

◆ geoSystem