SoGeoOrigin(3) The SoGeoOrigin class is used to specify an absolute geographic location against which geometry is referenced.


#include <Inventor/nodes/SoGeoOrigin.h>

Inherits SoNode.

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)

Static Public Member Functions

static SoType getClassTypeId (void)

static void initClass (void)

Public Attributes

SoSFVec3d geoCoords

SoMFString geoSystem

Protected Member Functions

virtual const SoFieldData * getFieldData (void) const

virtual ~SoGeoOrigin ()

Static Protected Member Functions

static const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

Detailed Description

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


    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 postition 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 precison array to a single precision array which is relative to the SoGeoOrgin node.

One note regarding UTM projections: Since it's quite common to assume a flat earth when working with UTM data, it's 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 }


Coin 2.5

Constructor & Destructor Documentation

SoGeoOrigin::SoGeoOrigin (void)


SoGeoOrigin::~SoGeoOrigin () [protected], [virtual]


Member Function Documentation

SoType SoGeoOrigin::getClassTypeId (void) [static]

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

Reimplemented from SoNode.

SoType SoGeoOrigin::getTypeId (void) const [virtual]

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.

Usage example:

  void foo(SoNode * node)
    if (node->getTypeId() == SoFile::getClassTypeId()) {
      SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Implements SoBase.

const SoFieldData ** SoGeoOrigin::getFieldDataPtr (void) [static], [protected]

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

Reimplemented from SoNode.

const SoFieldData * SoGeoOrigin::getFieldData (void) const [protected], [virtual]

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

Reimplemented from SoFieldContainer.

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.

Reimplemented from SoNode.

void SoGeoOrigin::doAction (SoAction *action) [virtual]

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

Reimplemented from SoNode.

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.

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 who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoNode.

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 calculates their bounding box also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

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.

void SoGeoOrigin::pick (SoPickAction *action) [virtual]

Action method for SoPickAction.

Does common processing for SoPickAction action instances.

Reimplemented from SoNode.

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 calculates their primitive count also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

Member Data Documentation

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>.

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.

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.


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