SoOrthographicCamera Class Reference

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SoOrthographicCamera Class Reference
Node Classes

The SoOrthographicCamera class defines a camera node with orthographic rendering.Orthographic rendering will not give a particularly realistic impression of the scene, but non-realistic rendering is for various reasons widely used in applications for e.g. Computer Aided Design. More...

`#include <Inventor/nodes/SoOrthographicCamera.h>`

Inheritance diagram for SoOrthographicCamera:

## Public Member Functions
virtual SoType | getTypeId (void) const
| SoOrthographicCamera (void)
virtual void | scaleHeight (float scalefactor)
virtual SbViewVolume | getViewVolume (float useaspectratio=0.0f) const
Public Member Functions inherited from SoCamera
void | pointAt (const SbVec3f &targetpoint)
void | pointAt (const SbVec3f &targetpoint, const SbVec3f &upvector)
void | viewAll (SoNode *const sceneroot, const SbViewportRegion &vpregion, const float slack=1.0f)
void | viewAll (SoPath *const path, const SbViewportRegion &vpregion, const float slack=1.0f)
SbViewportRegion | getViewportBounds (const SbViewportRegion &region) const
void | setStereoMode (StereoMode mode)
StereoMode | getStereoMode (void) const
void | setStereoAdjustment (float adjustment)
float | getStereoAdjustment (void) const
void | setBalanceAdjustment (float adjustment)
float | getBalanceAdjustment (void) const
virtual void | doAction (SoAction *action)
virtual void | callback (SoCallbackAction *action)
virtual void | GLRender (SoGLRenderAction *action)
virtual void | audioRender (SoAudioRenderAction *action)
virtual void | getBoundingBox (SoGetBoundingBoxAction *action)
virtual void | handleEvent (SoHandleEventAction *action)
virtual void | rayPick (SoRayPickAction *action)
virtual void | getPrimitiveCount (SoGetPrimitiveCountAction *action)
Public Member Functions inherited from SoNode
void | setOverride (const SbBool state)
SbBool | isOverride (void) const
void | setNodeType (const NodeType type)
NodeType | getNodeType (void) const
virtual SoNode * | copy (SbBool copyconnections=FALSE) const
virtual SbBool | affectsState (void) const
virtual void | GLRenderBelowPath (SoGLRenderAction *action)
virtual void | GLRenderInPath (SoGLRenderAction *action)
virtual void | GLRenderOffPath (SoGLRenderAction *action)
virtual void | getMatrix (SoGetMatrixAction *action)
virtual void | pick (SoPickAction *action)
virtual void | search (SoSearchAction *action)
virtual void | write (SoWriteAction *action)
virtual void | grabEventsSetup (void)
virtual void | grabEventsCleanup (void)
virtual void | startNotify (void)
virtual void | notify (SoNotList *l)
uint32_t | getNodeId (void) const
virtual SoChildList * | getChildren (void) const
virtual void | writeInstance (SoOutput *out)
virtual SoNode * | addToCopyDict (void) const
virtual void | copyContents (const SoFieldContainer *from, SbBool copyconnections)
virtual SoFieldContainer * | copyThroughConnection (void) const
Public Member Functions inherited from SoFieldContainer
void | setToDefaults (void)
SbBool | hasDefaultValues (void) const
SbBool | fieldsAreEqual (const SoFieldContainer *container) const
void | copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
SbBool | set (const char *const fielddata)
void | get (SbString &fielddata)
virtual int | getFields (SoFieldList &l) const
virtual int | getAllFields (SoFieldList &l) const
virtual SoField * | getField (const SbName &name) const
virtual SoField * | getEventIn (const SbName &name) const
virtual SoField * | getEventOut (const SbName &name) const
SbBool | getFieldName (const SoField *const field, SbName &name) const
SbBool | enableNotify (const SbBool flag)
SbBool | isNotifyEnabled (void) const
SbBool | set (const char *fielddata, SoInput *input)
void | get (SbString &fielddata, SoOutput *out)
virtual SbBool | validateNewFieldValue (SoField *field, void *newval)
virtual void | addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
SbBool | getIsBuiltIn (void) const
virtual void | getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
void | setUserData (void *userdata) const
void * | getUserData (void) const
Public Member Functions inherited from SoBase
void | ref (void) const
void | unref (void) const
void | unrefNoDelete (void) const
int32_t | getRefCount (void) const
void | touch (void)
SbBool | isOfType (SoType type) const
virtual SbName | getName (void) const
virtual void | setName (const SbName &newname)
void | addAuditor (void *const auditor, const SoNotRec::Type type)
void | removeAuditor (void *const auditor, const SoNotRec::Type type)
const SoAuditorList & | getAuditors (void) const
SbBool | shouldWrite (void)
void | assertAlive (void) const

## Static Public Member Functions
static SoType | getClassTypeId (void)
static void | initClass (void)
Static Public Member Functions inherited from SoCamera
static SoType | getClassTypeId (void)
static void | initClass (void)
Static Public Member Functions inherited from SoNode
static uint32_t | getCompatibilityTypes (const SoType &nodetype)
static SoType | getClassTypeId (void)
static SoNode * | getByName (const SbName &name)
static int | getByName (const SbName &name, SoNodeList &l)
static void | initClass (void)
static void | initClasses (void)
static uint32_t | getNextNodeId (void)
static int | getActionMethodIndex (const SoType type)
static void | getBoundingBoxS (SoAction *action, SoNode *node)
static void | GLRenderS (SoAction *action, SoNode *node)
static void | callbackS (SoAction *action, SoNode *node)
static void | getMatrixS (SoAction *action, SoNode *node)
static void | handleEventS (SoAction *action, SoNode *node)
static void | pickS (SoAction *action, SoNode *node)
static void | rayPickS (SoAction *action, SoNode *node)
static void | searchS (SoAction *action, SoNode *node)
static void | writeS (SoAction *action, SoNode *node)
static void | audioRenderS (SoAction *action, SoNode *node)
static void | getPrimitiveCountS (SoAction *action, SoNode *node)
Static Public Member Functions inherited from SoFieldContainer
static void | initClass (void)
static SoType | getClassTypeId (void)
static void | cleanupClass (void)
static void | initCopyDict (void)
static void | addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
static SoFieldContainer * | checkCopy (const SoFieldContainer *orig)
static SoFieldContainer * | findCopy (const SoFieldContainer *orig, const SbBool copyconnections)
static void | copyDone (void)
Static Public Member Functions inherited from SoBase
static void | initClass (void)
static SoType | getClassTypeId (void)
static void | addName (SoBase *const base, const char *const name)
static void | removeName (SoBase *const base, const char *const name)
static void | incrementCurrentWriteCounter (void)
static void | decrementCurrentWriteCounter (void)
static SoBase * | getNamedBase (const SbName &name, SoType type)
static int | getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
static SbBool | read (SoInput *input, SoBase *&base, SoType expectedtype)
static void | setInstancePrefix (const SbString &c)
static void | setTraceRefs (SbBool trace)
static SbBool | getTraceRefs (void)
static SbBool | connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
static SbBool | readRoute (SoInput *input)

## Public Attributes
SoSFFloat | height
Public Attributes inherited from SoCamera
SoSFEnum | viewportMapping
SoSFVec3f | position
SoSFRotation | orientation
SoSFFloat | aspectRatio
SoSFFloat | nearDistance
SoSFFloat | farDistance
SoSFFloat | focalDistance

## Protected Member Functions
virtual const SoFieldData * | getFieldData (void) const
virtual | ~SoOrthographicCamera ()
virtual void | viewBoundingBox (const SbBox3f &box, float aspect, float slack)
Protected Member Functions inherited from SoCamera
| SoCamera (void)
virtual | ~SoCamera ()
virtual void | jitter (int numpasses, int curpass, const SbViewportRegion &vpreg, SbVec3f &jitteramount) const
Protected Member Functions inherited from SoNode
| SoNode (void)
virtual | ~SoNode ()
virtual SbBool | readInstance (SoInput *in, unsigned short flags)
Protected Member Functions inherited from SoFieldContainer
| SoFieldContainer (void)
virtual | ~SoFieldContainer ()
Protected Member Functions inherited from SoBase
| SoBase (void)
virtual | ~SoBase ()
virtual void | destroy (void)
SbBool | hasMultipleWriteRefs (void) const
SbBool | writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
void | writeFooter (SoOutput *out) const
virtual const char * | getFileFormatName (void) const

## Static Protected Member Functions
static const SoFieldData ** | getFieldDataPtr (void)
Static Protected Member Functions inherited from SoCamera
static const SoFieldData ** | getFieldDataPtr (void)
Static Protected Member Functions inherited from SoNode
static const SoFieldData ** | getFieldDataPtr (void)
static void | setNextActionMethodIndex (int index)
static int | getNextActionMethodIndex (void)
static void | incNextActionMethodIndex (void)
static void | setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)
Static Protected Member Functions inherited from SoBase
static uint32_t | getCurrentWriteCounter (void)
static void | staticDataLock (void)
static void | staticDataUnlock (void)

## Additional Inherited Members
Public Types inherited from SoCamera
enum | ViewportMapping { CROP_VIEWPORT_FILL_FRAME, CROP_VIEWPORT_LINE_FRAME, CROP_VIEWPORT_NO_FRAME, ADJUST_CAMERA, LEAVE_ALONE }
enum | StereoMode { MONOSCOPIC, LEFT_VIEW, RIGHT_VIEW }
Public Types inherited from SoNode
enum | NodeType { INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002, INVENTOR_1 = 0x0004, INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010, INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040, COIN_1_0 = 0x0080, COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400, COIN_2_3 = 0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000, COIN_3_0 = 0x8000, INVENTOR_6_0 = 0x10000 }
Protected Types inherited from SoBase
enum | BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }
Protected Attributes inherited from SoNode
uint32_t | uniqueId
Protected Attributes inherited from SoFieldContainer
SbBool | isBuiltIn
Static Protected Attributes inherited from SoNode
static uint32_t | nextUniqueId = 1
static int | nextActionMethodIndex = 0

## Detailed Description

The SoOrthographicCamera class defines a camera node with orthographic rendering.

Orthographic rendering will not give a particularly realistic impression of the scene, but non-realistic rendering is for various reasons widely used in applications for e.g. Computer Aided Design.

Also, a simple technique for drawing overlay / HUD style graphics (often appearing to be in 2D) can be implemented by setting up a "sub scene graph" with an SoOrthographicCamera and the geometry. As a simple demonstration of this concept, load this file into e.g. the ExaminerViewer:

    #Inventor V2.1 ascii

    Separator {
       PerspectiveCamera { position 0 0 5 }
       Cone { }

       Separator {
          OrthographicCamera {
             position -0.75 -0.75 2
          }
          BaseColor { rgb 1 1 0 }
          Sphere { radius 0.2 }
       }
    }

You will likely encounter Z-buffer issues with this technique which makes the overlay / HUD graphics end up interspersed with the "real" geometry. If so, this can be solved by e.g. inserting an SoCallback node in the sub-scene, where you let the callback disable the depth buffer with glDisable(GL_DEPTH_TEST).

FILE FORMAT/DEFAULTS:

OrthographicCamera {
viewportMapping ADJUST_CAMERA
position 0 0 1
orientation 0 0 1 0
nearDistance 1
farDistance 10
aspectRatio 1
focalDistance 5
height 2
}

## Constructor & Destructor Documentation

SoOrthographicCamera::SoOrthographicCamera | ( | void |  | ) |

Constructor.

SoOrthographicCamera::~SoOrthographicCamera | ( |  | ) |
| protectedvirtual

Destructor.

## Member Function Documentation

SoType SoOrthographicCamera::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.

Reimplemented from SoCamera.

const SoFieldData * SoOrthographicCamera::getFieldData | ( | void |  | ) | const
| protectedvirtual

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

Reimplemented from SoCamera.

void SoOrthographicCamera::scaleHeight | ( | float | scalefactor | ) |
| virtual

Scale SoOrthographicCamera::height by multiplying with scalefactor.

Implements SoCamera.

SbViewVolume SoOrthographicCamera::getViewVolume | ( | float | useaspectratio = `0.0f` | ) | const
| virtual

Returns total view volume covered by the camera under the current settings.

This view volume is not adjusted to account for viewport mapping. If you want the same view volume as the one used during rendering, you should do something like this:

    SbViewVolume vv;
    float aspectratio = myviewport.getViewportAspectRatio();

    switch (camera->viewportMapping.getValue()) {
    case SoCamera::CROP_VIEWPORT_FILL_FRAME:
    case SoCamera::CROP_VIEWPORT_LINE_FRAME:
    case SoCamera::CROP_VIEWPORT_NO_FRAME:
      vv = camera->getViewVolume(0.0f);
      break;
    case SoCamera::ADJUST_CAMERA:
      vv = camera->getViewVolume(aspectratio);
      if (aspectratio < 1.0f) vv.scale(1.0f / aspectratio);
      break;
    case SoCamera::LEAVE_ALONE:
      vv = camera->getViewVolume(0.0f);
      break;
    default:
      assert(0 && "unknown viewport mapping");
      break;
    }

Also, for the CROPPED viewport mappings, the viewport might be changed if the viewport aspect ratio is not equal to the camera aspect ratio. See SoCamera::getView() to see how this is done.

Implements SoCamera.

void SoOrthographicCamera::viewBoundingBox | ( | const SbBox3f & | box,
|  | float | aspect,
|  | float | slack
| ) |  |
| protectedvirtual

Convenience method for setting up the camera definition to cover the given bounding box with the given aspect ratio. Multiplies the exact dimensions with a slack factor to have some space between the rendered model and the borders of the rendering area.

If you define your own camera node class, be aware that this method should not set the orientation field of the camera, only the position, focal distance and near and far clipping planes.

Implements SoCamera.

## Member Data Documentation

SoSFFloat SoOrthographicCamera::height

Height of viewport in world-space scale. Defaults to 2.0 units.

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

- SoOrthographicCamera.h
- SoOrthographicCamera.cpp

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