Property node that sets the polygon offset. More...
#include <Inventor/nodes/SoPolygonOffset.h>
Public Types | |
enum | Style { FILLED = SoPolygonOffsetElement::FILLED , LINES = SoPolygonOffsetElement::LINES , POINTS = SoPolygonOffsetElement::POINTS } |
Offset style. More... | |
Public Member Functions | |
virtual SoType | getTypeId () const |
Returns the type identifier for this specific instance. | |
SoPolygonOffset () | |
Constructor. | |
virtual void | setOverride (const SbBool state) |
Set the state of the override field. | |
virtual SbBool | isOverride () const |
Returns the state of the override field. | |
Public Member Functions inherited from SoNode | |
virtual SoNode * | copy (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 SoField * | getField (const SbName &fieldName) const |
Returns a the field of this object whose name is fieldName. | |
virtual SoField * | getEventIn (const SbName &fieldName) const |
Returns a the eventIn with the given name. | |
virtual SoField * | getEventOut (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 Public Member Functions inherited from SoNode | |
static SoType | getClassTypeId () |
Returns the type identifier for this class. | |
static SoNode * | getByName (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 | |
SoSFFloat | factor |
Specifies a scale factor that is used to create a variable depth offset for each polygon. | |
SoSFFloat | units |
Is multiplied by an OpenGL implementation-specific value to create a constant depth offset. | |
SoSFBitMask | styles |
A bit-wise combination of FILLED, LINES, and POINTS that determines which polygon modes should be offset. | |
SoSFBool | on |
Enables/disables polygon offset. | |
Property node that sets the polygon offset.
This class encapsulates the OpenGL 1.1 glPolygonOffset() function. This node can be used to offset polygons that are at the exact same depth to avoid depth buffer artifacts, commonly called z-buffer stitching.
NOTE: SoPolygonOffset, as its name implies, only works with polygonal geometry.
SoPolygonOffset affects filled primitives such as SoFaceSet and SoTriangleStripSet.
It also affects lines and points in the limited sense that it affects polygonal primitives when the draw style is set to LINES or POINTS. However, because polygon offset does not affect non-polygonal geometry, primitives such as SoLineSet and SoPointSet cannot be offset with SoPolygonOffset(). To avoid depth buffer artifacts with mixed polygonal and non-polygonal geometry, you should "push" the polygonal geometry away from the camera.
Note: There is only one offset value (combination of factor and units) in the traversal state at any given time.
The value of the offset is factor * z + r * units, where
So units produces a constant depth offset and factor produces a variable depth offset which is zero when a polygon is perpendicular to the view vector (parallel to the view plane) and increases as the depth slope increases.
Both factor and units may be either positive or negative. A positive offset value pushes primitives away from the camera and a negative value pulls them closer. Generally a small value, like 1.0, is sufficient for both parameters.
factor | 1 |
units | 100 |
styles | FILLED |
on | TRUE |
Definition at line 100 of file SoPolygonOffset.h.
Offset style.
Enumerator | |
---|---|
FILLED | Filled. |
LINES | Lines. |
POINTS | Points. |
Definition at line 107 of file SoPolygonOffset.h.
SoPolygonOffset::SoPolygonOffset | ( | ) |
Constructor.
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static |
Returns the type identifier for this class.
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virtual |
Returns the type identifier for this specific instance.
Reimplemented from SoNode.
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inlinevirtual |
Returns the state of the override field.
Reimplemented from SoNode.
Definition at line 157 of file SoPolygonOffset.h.
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inlinevirtual |
Set the state of the override field.
see SoNode::setOverride doc.
Reimplemented from SoNode.
Definition at line 151 of file SoPolygonOffset.h.
SoSFFloat SoPolygonOffset::factor |
Specifies a scale factor that is used to create a variable depth offset for each polygon.
Positive values push polygons away from the camera (opposite of SoDepthOffset). Default = 1.0.
Definition at line 122 of file SoPolygonOffset.h.
SoSFBool SoPolygonOffset::on |
SoSFBitMask SoPolygonOffset::styles |
A bit-wise combination of FILLED, LINES, and POINTS that determines which polygon modes should be offset.
Default = FILLED.
Definition at line 135 of file SoPolygonOffset.h.
SoSFFloat SoPolygonOffset::units |
Is multiplied by an OpenGL implementation-specific value to create a constant depth offset.
Positive values push polygons away from the camera (oppsite of SoDepthOffset). Default = 100.0.
Definition at line 129 of file SoPolygonOffset.h.