SoProjection Class Reference

VSG extension Coordinate projection node More...

#include <Inventor/nodes/SoProjection.h>

Inheritance diagram for SoProjection:
SoNode SoFieldContainer SoBase SoRefCounter SoTypedObject SoGeoProjection SoTransformProjection

List of all members.

Public Member Functions

virtual SoType getTypeId () const
 SoProjection ()
void addProjection (SbString &projectionName, SbProjection *projection, int id)
void setProjection (SbProjection *projection)
void getCurrentProjectionInfos (SbString &name, int &id)
SbProjectiongetProjection () const

Static Public Member Functions

static SoType getClassTypeId ()
static SbVec3fcheckProjection (SoState *state, SoNode *node, int32_t numCoords, const SbVec3f *coords)

Public Attributes

SoSFBool isOn
SoSFMatrix matrix
SoSFInt32 projTypeId
SoMFFloat floatParameters
SoMFString parameters
SoMFString parametersIn

Detailed Description

VSG extension Coordinate projection node

This property node defines a coordinate projection that will be applied to all subsequent shapes in the scene graph. Coordinate transform nodes like SoTransform can only apply transforms that can be expressed as a matrix. A coordinate projection can be any algorithm that takes a coordinate and returns a different coordinate. This is particularly useful for geospatial coordinate systems (see SoGeoProjection), but is also useful for using spherical, cylindrical and other coordinate systems directly.

This node works together with projection classes derived from the SbProjection class. The projection classes implement the projection computations applied to 3D points. Applications can create new subclasses of SbProjection.

To use a specific projection, call setProjection() with an instance of the SbProjection class. Each instance of SoProjection can also store a list of projections, each one associated with a unique id. This is convenient for switching between different geospatial projections. Changing the projTypeId value activates the projection registered with the corresponding id.

The default projection is spherical coordinates (SbSphericalProjection).

The projection classes will use the string parameters and float parameters in the fields parameters and floatParameters respectively. See the projection class documentation for relevant parameters.

Normal vectors





SbProjection, SbSphericalProjection, SoGeoProjection

See related examples:

CustomProjection, VolumeProjection

Constructor & Destructor Documentation

SoProjection::SoProjection (  ) 


Member Function Documentation

void SoProjection::addProjection ( SbString projectionName,
SbProjection projection,
int  id 

Add a projection with the given name and id to the list.

The projection name is just for convenience. The projection id value should be greater than zero because the default spherical projection already uses this id. If multiple projections are assigned the same id, the first one added to the list will be used.

static SbVec3f* SoProjection::checkProjection ( SoState state,
SoNode node,
int32_t  numCoords,
const SbVec3f coords 
) [static]

Apply projection to given coordinates.

Store projected coordinates in current SoCoordinate3 element.

static SoType SoProjection::getClassTypeId (  )  [static]

Returns the type identifier for this class.

Reimplemented from SoNode.

Reimplemented in SoGeoProjection, and SoTransformProjection.

void SoProjection::getCurrentProjectionInfos ( SbString name,
int &  id 

Return current projection name and id.

SbProjection* SoProjection::getProjection (  )  const [inline]

Return current projection.

virtual SoType SoProjection::getTypeId (  )  const [virtual]

Returns the type identifier for this specific instance.

Reimplemented from SoNode.

Reimplemented in SoGeoProjection, and SoTransformProjection.

void SoProjection::setProjection ( SbProjection projection  ) 

Set the current projection.

The specified projection is used regardless of whether it is in the list. In this case the value of the projTypeId field is not used.

Member Data Documentation

Float parameters stored for projections.

If set to FALSE, projection is inactive.

Default is TRUE.

Matrix that can be applied before projecting a point.

Set to Identity by default

String parameters stored for projections.

String parameters stored for projections.

Current projection id.

Default is zero.

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

Open Inventor Toolkit reference manual, generated on 24 Mar 2020
Copyright © Thermo Fisher Scientific All rights reserved.