Open Inventor Release 2024.2.0
 
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SoProjection Class Reference

VSG extension Coordinate projection node More...

#include <Inventor/nodes/SoProjection.h>

+ Inheritance diagram for SoProjection:

Public Member Functions

virtual SoType getTypeId () const
 Returns the type identifier for this specific instance.
 
 SoProjection ()
 Constructor.
 
void addProjection (SbString &projectionName, SbProjection *projection, int id)
 Add a projection with the given name and id to the list.
 
void setProjection (SbProjection *projection)
 Set the current projection.
 
void getCurrentProjectionInfos (SbString &name, int &id)
 Return current projection name and id.
 
SbProjectiongetProjection () const
 Return current projection.
 
- Public Member Functions inherited from SoNode
virtual void setOverride (const SbBool state)
 Turns the override flag on or off.
 
virtual SbBool isOverride () const
 Returns the state of the override flag.
 
virtual SoNodecopy (SbBool copyConnections=FALSE) const
 Creates and returns an exact copy of the node.
 
virtual SbBool affectsState () const
 Returns TRUE if a node has an effect on the state during traversal.
 
virtual void touch ()
 Marks an instance as modified, simulating a change to it.
 
- Public Member Functions inherited from SoFieldContainer
void setToDefaults ()
 Sets all fields in this object to their default values.
 
SbBool hasDefaultValues () const
 Returns TRUE if all of the object's fields have their default values.
 
SbBool fieldsAreEqual (const SoFieldContainer *fc) const
 Returns TRUE if this object's fields are exactly equal to fc's fields.
 
void copyFieldValues (const SoFieldContainer *fc, SbBool copyConnections=FALSE)
 Copies the contents of fc's fields into this object's fields.
 
SoNONUNICODE SbBool set (const char *fieldDataString)
 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.
 
SbBool set (const SbString &fieldDataString)
 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.
 
void get (SbString &fieldDataString)
 Returns the values of the fields of this object in the Open Inventor ASCII file format in the given string.
 
virtual int getFields (SoFieldList &list) const
 Appends references to all of this object's fields to resultList, and returns the number of fields appended.
 
virtual int getAllFields (SoFieldList &list) const
 Returns a list of fields, including the eventIn's and eventOut's.
 
virtual SoFieldgetField (const SbName &fieldName) const
 Returns a the field of this object whose name is fieldName.
 
virtual SoFieldgetEventIn (const SbName &fieldName) const
 Returns a the eventIn with the given name.
 
virtual SoFieldgetEventOut (const SbName &fieldName) const
 Returns the eventOut with the given name.
 
SbBool getFieldName (const SoField *field, SbName &fieldName) const
 Returns the name of the given field in the fieldName argument.
 
SbBool enableNotify (SbBool flag)
 Notification at this Field Container is enabled (if flag == TRUE) or disabled (if flag == FALSE).
 
SbBool isNotifyEnabled () const
 Notification is the process of telling interested objects that this object has changed.
 
virtual void setUserData (void *data)
 Sets application data.
 
void * getUserData (void) const
 Gets user application data.
 
- Public Member Functions inherited from SoBase
virtual SbName getName () const
 Returns the name of an instance.
 
virtual void setName (const SbName &name)
 Sets the name of an instance.
 
void setSynchronizable (const bool b)
 Sets this to be a ScaleViz synchronizable object.
 
bool isSynchronizable () const
 Gets the ScaleViz synchronizable state of this object.
 
- Public Member Functions inherited from SoRefCounter
void ref () const
 Adds a reference to an instance.
 
void unref () const
 Removes a reference from an instance.
 
void unrefNoDelete () const
 unrefNoDelete() should be called when it is desired to decrement the reference count, but not delete the instance if this brings the reference count to zero.
 
int getRefCount () const
 Returns current reference count.
 
void lock () const
 lock this instance.
 
void unlock () const
 unlock this instance.
 
- Public Member Functions inherited from SoTypedObject
SbBool isOfType (const SoType &type) const
 Returns TRUE if this object is of the type specified in type or is derived from that type.
 
template<typename TypedObjectClass >
SbBool isOfType () const
 Returns TRUE if this object is of the type of class TypedObjectClass or is derived from that class.
 

Static Public Member Functions

static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SbVec3fcheckProjection (SoState *state, SoNode *node, int32_t numCoords, const SbVec3f *coords)
 Apply projection to given coordinates.
 
- Static Public Member Functions inherited from SoNode
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 
static SoNodegetByName (const SbName &name)
 A node's name can be set using SoBase::setName().
 
static int getByName (const SbName &name, SoNodeList &list)
 A node's name can be set using SoBase::setName().
 
- Static Public Member Functions inherited from SoFieldContainer
static SoType getClassTypeId ()
 Returns the type of this class.
 
- Static Public Member Functions inherited from SoBase
static SoType getClassTypeId ()
 Returns type identifier for this class.
 
- Static Public Member Functions inherited from SoTypedObject
static SoType getClassTypeId ()
 Returns the type identifier for this class.
 

Public Attributes

SoSFBool isOn
 If set to FALSE, projection is inactive.
 
SoSFMatrix matrix
 Matrix that can be applied before projecting a point.
 
SoSFInt32 projTypeId
 Current projection id.
 
SoMFFloat floatParameters
 Float parameters stored for projections.
 
SoMFString parameters
 String parameters stored for projections.
 
SoMFString parametersIn
 String parameters stored for projections.
 

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

  • If no normal vectors are given for the geometry (and normal vectors are needed), Open Inventor will automatically compute normal vectors using the projected vertices, i.e. the coordinates after projection has been applied. This is usually the desired result.
  • If normal vectors are specified for the geometry, they are not projected. Therefore normal vectors must be specified in post-projection (world) coordinates.

LIMITATIONS

FILE FORMAT/DEFAULT

    Projection {
    parameters ""
    matrix identity
    isOn true
    floatParameters 1
    projTypeId 0
    }

ACTION BEHAVIOR

SEE ALSO

SbProjection, SbSphericalProjection, SoGeoProjection

Definition at line 142 of file SoProjection.h.

Constructor & Destructor Documentation

◆ SoProjection()

SoProjection::SoProjection ( )

Constructor.

Member Function Documentation

◆ addProjection()

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.

◆ checkProjection()

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.

◆ getClassTypeId()

static SoType SoProjection::getClassTypeId ( )
static

Returns the type identifier for this class.


◆ getCurrentProjectionInfos()

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

Return current projection name and id.

◆ getProjection()

SbProjection * SoProjection::getProjection ( ) const
inline

Return current projection.

Definition at line 209 of file SoProjection.h.

◆ getTypeId()

virtual SoType SoProjection::getTypeId ( ) const
virtual

Returns the type identifier for this specific instance.

Reimplemented from SoNode.

Reimplemented in SoGeoProjection, and SoTransformProjection.

◆ setProjection()

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

◆ floatParameters

SoMFFloat SoProjection::floatParameters

Float parameters stored for projections.

Definition at line 173 of file SoProjection.h.

◆ isOn

SoSFBool SoProjection::isOn

If set to FALSE, projection is inactive.

Default is TRUE.

Definition at line 157 of file SoProjection.h.

◆ matrix

SoSFMatrix SoProjection::matrix

Matrix that can be applied before projecting a point.

Set to Identity by default

Definition at line 162 of file SoProjection.h.

◆ parameters

SoMFString SoProjection::parameters

String parameters stored for projections.

Definition at line 178 of file SoProjection.h.

◆ parametersIn

SoMFString SoProjection::parametersIn

String parameters stored for projections.

Definition at line 183 of file SoProjection.h.

◆ projTypeId

SoSFInt32 SoProjection::projTypeId

Current projection id.

Default is zero.

Definition at line 168 of file SoProjection.h.


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