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Open Inventor Release 2024.2.0
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Open Inventor Release 2024.2.0
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Property node that applies a depth offset.
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#include <Inventor/nodes/SoDepthOffset.h>
Inheritance diagram for SoDepthOffset:Public Member Functions | |
| virtual SoType | getTypeId () const |
| Returns the type identifier for this specific instance. | |
| SoDepthOffset () | |
| Constructor. | |
| 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 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 | offset |
| Offset to apply to the projection matrix. | |
| SoSFBool | on |
| Enables depth offset. | |
Property node that applies a depth offset.
This node can be used to offset shapes that are co-planar, in order to resolve depth buffer artifacts, commonly called z-buffer "stitching".
The effect is similar to SoPolygonOffset but this node uses a different algorithm (based on Lengyel's method from Game Programming Gems and improved by VSG) in which the projection matrix is modified to offset subsequent geometry. As a result it has advantages over SoPolygonOffset in some cases. Specifically, SoDepthOffset applies its offset value to all types of geometry, not just polygons, and does not require any additional per-vertex calculations on the GPU.
The offset value is accumulated in the traversal state. For example:
Note that if the accumulation of offset values during the traversal is greater than 1, the accumulated offset value is normalized so that, in this case, the offset values are not absolute but relative to each other.
SoDepthOffset has two limitations. First, since it modifies the projection matrix during traversal, it may prevent building a render cache for part of the scene graph. Second, the offset does not take into account the depth slope of the geometry (as SoPolygonOffset does), so a larger offset may be required for geometry that is not perpendicular to the view vector (facing the camera).
The presence of a SoDepthOffset node in the scene graph causes depth buffer values to be different, even if 'offset' is equal to 0.
The render caching issue is easily handled, by adjusting your scene graph structure, just as you would for any non-cacheable node, to ensure that the actual shape nodes are cached even if the parent group node cannot cache:
For example, using this scene graph structure:
instead of this one:
| offset | 0.001 |
| on | TRUE |
SoPolygonOffset, SoDepthBuffer, SoOverlayGroup
Definition at line 91 of file SoDepthOffset.h.
| SoDepthOffset::SoDepthOffset | ( | ) |
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.
| SoSFFloat SoDepthOffset::offset |
Offset to apply to the projection matrix.
Positive values move geometry toward the camera (the opposite of SoPolygonOffset). Offset value must be in the range [-0.5 .. 0.5] (normalized depth coordinates). Default is 0.001
Definition at line 107 of file SoDepthOffset.h.
| SoSFBool SoDepthOffset::on |
Enables depth offset.
NOTE: field available since Open Inventor 8.1
Definition at line 113 of file SoDepthOffset.h.
1.9.8 