The SoCamera class is the abstract base class for camera definition nodes.To be able to view a scene, one needs to have a camera in the scene graph. A camera node will set up the projection and viewing matrices for rendering of the geometry in the scene. More...

#include <Inventor/nodes/SoCamera.h>

Inheritance diagram for SoCamera:

Public Types
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, COIN_4_0 = 0x20000 }

Public Member Functions
virtual SoType	getTypeId (void) const
	Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and "downward" casting. More...

SbViewVolume	getViewVolume (const SbViewportRegion &vp, SbViewportRegion &resultvp, const SbMatrix &mm=SbMatrix::identity()) const

void	pointAt (const SbVec3f &targetpoint)

void	pointAt (const SbVec3f &targetpoint, const SbVec3f &upvector)

virtual void	scaleHeight (float scalefactor)=0

virtual SbViewVolume	getViewVolume (float useaspectratio=0.0f) const =0

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)

virtual void	viewBoundingBox (const SbBox3f &box, float aspect, float slack)=0

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
	Returns `TRUE` if the type of this object is either of the same type or inherited from type. More...

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 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)
	Sets up initialization for data common to all instances of this class, like submitting necessary information to the Coin type system.

static SoType	getClassTypeId (void)
	This static method returns the SoType object associated with objects of this class.

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
SoSFEnum	viewportMapping

SoSFVec3f	position

SoSFRotation	orientation

SoSFFloat	aspectRatio

SoSFFloat	nearDistance

SoSFFloat	farDistance

SoSFFloat	focalDistance

Protected Member Functions
virtual const SoFieldData *	getFieldData (void) const

	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

virtual SoNotRec	createNotRec (void)

Static Protected Member Functions
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
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 SoCamera class is the abstract base class for camera definition nodes.

To be able to view a scene, one needs to have a camera in the scene graph. A camera node will set up the projection and viewing matrices for rendering of the geometry in the scene.

This node just defines the abstract interface by collecting common fields that all camera type nodes needs. Use the non-abstract camera node subclasses within a scene graph. The ones that are default part of the Coin library are SoPerspectiveCamera and SoOrthographicCamera, which uses the two different projections given by their name.

Note that the viewer components of the GUI glue libraries of Coin (SoXt, SoQt, SoWin, etc) will automatically insert a camera into a scene graph if none has been defined.

It is possible to have more than one camera in a scene graph. One common trick is for instance to use a second camera to display static geometry or overlay geometry (e.g. for head-up displays ("HUD")), as shown by this example code:

#include <Inventor/Qt/SoQt.h>
#include <Inventor/Qt/viewers/SoQtExaminerViewer.h>
#include <Inventor/nodes/SoNodes.h>
int
main(int argc, char ** argv)
{
  QWidget * mainwin = SoQt::init(argv[0]);
  SoSeparator * root = new SoSeparator;
  root->ref();
  // Adds a camera and a red cone. The first camera found in the
  // scene graph by the SoQtExaminerViewer will be picked up and
  // initialized automatically.
  root->addChild(new SoPerspectiveCamera);
  SoMaterial * material = new SoMaterial;
  material->diffuseColor.setValue(1.0, 0.0, 0.0);
  root->addChild(material);
  root->addChild(new SoCone);
  // Set up a second camera for the remaining geometry. This camera
  // will not be picked up and influenced by the viewer, so the
  // geometry will be kept static.
  SoPerspectiveCamera * pcam = new SoPerspectiveCamera;
  pcam->position = SbVec3f(0, 0, 5);
  pcam->nearDistance = 0.1;
  pcam->farDistance = 10;
  root->addChild(pcam);
  // Adds a green cone to demonstrate static geometry.
  SoMaterial * greenmaterial = new SoMaterial;
  greenmaterial->diffuseColor.setValue(0, 1.0, 0.0);
  root->addChild(greenmaterial);
  root->addChild(new SoCone);
  SoQtExaminerViewer * viewer = new SoQtExaminerViewer(mainwin);
  viewer->setSceneGraph(root);
  viewer->show();
  SoQt::show(mainwin);
  SoQt::mainLoop();
  delete viewer;
  root->unref();
  return 0;
}

NB: The support for multiple cameras in Coin is limited, and problems with multiple cameras will be considered fixed on a case by case basis.

Member Enumeration Documentation

enum SoCamera::ViewportMapping

Enumerates the available possibilities for how the render frame should map the viewport.

enum SoCamera::StereoMode

Enumerates the possible stereo modes.

Enumerator
MONOSCOPIC	No stereo.
LEFT_VIEW	Left view.
RIGHT_VIEW	Right view.

Constructor & Destructor Documentation

SoCamera::SoCamera ( void )

protected

Constructor.

SoCamera::~SoCamera ( )

protectedvirtual

Destructor.

Member Function Documentation

SoType SoCamera::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.

Implements SoBase.

Reimplemented in SoFrustumCamera, SoOrthographicCamera, and SoPerspectiveCamera.

const SoFieldData * SoCamera::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 SoFieldContainer.

Reimplemented in SoFrustumCamera, SoOrthographicCamera, and SoPerspectiveCamera.

SbViewVolume SoCamera::getViewVolume	(	const SbViewportRegion &	vp,
		SbViewportRegion &	resultvp,
		const SbMatrix &	mm = `SbMatrix::identity()`
	)		const

Convenience method which returns the actual view volume used when rendering, adjusted for the current viewport mapping.

Supply the view's viewport in vp. If the viewport mapping is one of CROP_VIEWPORT_FILL_FRAME, CROP_VIEWPORT_LINE_FRAME or CROP_VIEWPORT_NO_FRAME, resultvp will be modified to contain the resulting viewport.

If you got any transformations in front of the camera, mm should contain this transformation.

Since: Coin 4.0

void SoCamera::pointAt ( const SbVec3f & targetpoint )

Reorients the camera so that it points towards targetpoint. The positive y-axis is used as the up vector of the camera, unless the new camera direction is parallel to this axis, in which case the positive z-axis will be used instead.

void SoCamera::pointAt	(	const SbVec3f &	targetpoint,
		const SbVec3f &	upvector
	)

Reorients the camera so that it points towards targetpoint, using upvector as the camera up vector.

This function is an extension for Coin, and it is not available in the original SGI Open Inventor v2.1 API.

void SoCamera::scaleHeight ( float scalefactor )

pure virtual

Sets a scalefactor for the height of the camera viewport. What "viewport height" means exactly in this context depends on the camera model. See documentation in subclasses.

Implemented in SoFrustumCamera, SoOrthographicCamera, and SoPerspectiveCamera.

SbViewVolume SoCamera::getViewVolume ( float useaspectratio = 0.0f ) const

pure 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 use getViewVolume(SbViewportRegion & vp, const SbMatrix & mm), or 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 the SoCamera::getView() source-code (private method) to see how this is done.

Implemented in SoFrustumCamera, SoOrthographicCamera, and SoPerspectiveCamera.

void SoCamera::viewAll	(	SoNode *const	sceneroot,
		const SbViewportRegion &	vpregion,
		const float	slack = `1.0f`
	)

Position the camera so that all geometry of the scene from sceneroot is contained in the view volume of the camera, while keeping the camera orientation constant.

Finds the bounding box of the scene and calls SoCamera::viewBoundingBox(). A bounding sphere will be calculated from the scene bounding box, so the camera will "view all" even when the scene is rotated, in any way.

The slack argument gives a multiplication factor to the distance the camera is supposed to move out from the sceneroot mid-point.

A value less than 1.0 for the slack argument will therefore cause the camera to come closer to the scene, a value of 1.0 will position the camera as exactly outside the scene bounding sphere, and a value larger than 1.0 will give "extra slack" versus the scene bounding sphere.

void SoCamera::viewAll	(	SoPath *const	path,
		const SbViewportRegion &	vpregion,
		const float	slack = `1.0f`
	)

Position the camera so all geometry of the scene in path is contained in the view volume of the camera.

Finds the bounding box of the scene and calls SoCamera::viewBoundingBox().

SbViewportRegion SoCamera::getViewportBounds ( const SbViewportRegion & region ) const

Based in the SoCamera::viewportMapping setting, convert the values of region to the viewport region we will actually render into.

void SoCamera::setStereoMode ( StereoMode mode )

Sets the stereo mode.

SoCamera::StereoMode SoCamera::getStereoMode ( void ) const

Returns the stereo mode.

void SoCamera::setStereoAdjustment ( float adjustment )

Sets the stereo adjustment. This is the distance between the left and right "eye" when doing stereo rendering.

When doing stereo rendering, Coin will render two views, one for the left eye, and one for the right eye. The stereo adjustment is, a bit simplified, how much the camera is translated along the local X-axis between the left and the right view.

The default distance is 0.1, which is chosen since it's the approximate distance between the human eyes.

To create a nice looking and visible stereo effect, the application programmer will often have to adjust this value. If all you want to do is examine simple stand-alone 3D objects, it is possible to calculate a stereo offset based on the bounding box of the 3D model (or scale the model down to an appropriate size).

However, if you have a large scene, where you want to fly around in the scene, and see stereo on different objects as you approach them, you can't calculate the stereo offset based on the bounding box of the scene, but rather use a stereo offset based on the scale of the individual objects/details you want to examine.

Please note that it's important to set a sensible focal distance when doing stereo rendering. See setBalanceAdjustment() for information about how the focal distance affects the stereo rendering.

See also: setBalanceAdjustment()

float SoCamera::getStereoAdjustment ( void ) const

Returns the stereo adjustment.

See also: setStereoAdjustment()

void SoCamera::setBalanceAdjustment ( float adjustment )

Sets the stereo balance adjustment. This is a factor that enables you to move the zero parallax plane. Geometry in front of the zero parallax plane will appear to be in front of the screen.

The balance adjustment is multiplied with the focal distance to find the zero parallax plane. The default value is 1.0, and the zero parallax plane is then at the focal point.

See also: SoCamera::focalDistance

float SoCamera::getBalanceAdjustment ( void ) const

Returns the stereo balance adjustment.

See also: setBalanceAdjustment()

void SoCamera::doAction ( SoAction * action )

virtual

This function performs the typical operation of a node for any action.

Reimplemented from SoNode.

void SoCamera::callback ( SoCallbackAction * action )

virtual

Action method for SoCallbackAction.

Simply updates the state according to how the node behaves for the render action, so the application programmer can use the SoCallbackAction for extracting information about the scene graph.

Reimplemented from SoNode.

void SoCamera::GLRender ( SoGLRenderAction * action )

virtual

Action method for the SoGLRenderAction.

This is called during rendering traversals. Nodes influencing the rendering state in any way or who wants to throw geometry primitives at OpenGL overrides this method.

Reimplemented from SoNode.

void SoCamera::audioRender ( SoAudioRenderAction * action )

virtual

Action method for SoAudioRenderAction.

Does common processing for SoAudioRenderAction action instances.

Reimplemented from SoNode.

void SoCamera::getBoundingBox ( SoGetBoundingBoxAction * action )

virtual

Action method for the SoGetBoundingBoxAction.

Calculates bounding box and center coordinates for node and modifies the values of the action to encompass the bounding box for this node and to shift the center point for the scene more towards the one for this node.

Nodes influencing how geometry nodes calculates their bounding box also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

void SoCamera::handleEvent ( SoHandleEventAction * action )

virtual

Picking actions can be triggered during handle event action traversal, and to do picking we need to know the camera state.

See also: SoCamera::rayPick()

Reimplemented from SoNode.

void SoCamera::rayPick ( SoRayPickAction * action )

virtual

Action method for SoRayPickAction.

Checks the ray specification of the action and tests for intersection with the data of the node.

Nodes influencing relevant state variables for how picking is done also overrides this method.

Reimplemented from SoNode.

void SoCamera::getPrimitiveCount ( SoGetPrimitiveCountAction * action )

virtual

Action method for the SoGetPrimitiveCountAction.

Calculates the number of triangle, line segment and point primitives for the node and adds these to the counters of the action.

Nodes influencing how geometry nodes calculates their primitive count also overrides this method to change the relevant state variables.

Reimplemented from SoNode.

void SoCamera::viewBoundingBox	(	const SbBox3f &	box,
		float	aspect,
		float	slack
	)

pure virtual

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.

Implemented in SoFrustumCamera, SoOrthographicCamera, and SoPerspectiveCamera.

void SoCamera::jitter	(	int	numpasses,
		int	curpass,
		const SbViewportRegion &	vpreg,
		SbVec3f &	jitteramount
	)		const

protectedvirtual

"Jitter" the camera according to the current rendering pass (curpass), to get an antialiased rendering of the scene when doing multipass rendering.

Member Data Documentation

SoSFEnum SoCamera::viewportMapping

Set up how the render frame should map the viewport. The default is SoCamera::ADJUST_CAMERA.

SoSFVec3f SoCamera::position

Camera position. Defaults to <0,0,1>.

SoSFRotation SoCamera::orientation

Camera orientation specified as a rotation value from the default orientation where the camera is pointing along the negative z-axis, with "up" along the positive y-axis.

E.g., to rotate the camera to point along the X axis:

mycamera->orientation.setValue(SbRotation(SbVec3f(0, 1, 0), M_PI / 2.0f));

For queries, e.g. to get the current "up" and "look at" vectors of the camera:

SbRotation camrot = mycamera->orientation.getValue();
SbVec3f upvec(0, 1, 0); // init to default up vector
camrot.multVec(upvec, upvec);
SbVec3f lookat(0, 0, -1); // init to default view direction vector
camrot.multVec(lookat, lookat);

SoSFFloat SoCamera::aspectRatio

Aspect ratio for the camera (i.e. width / height). Defaults to 1.0.

SoSFFloat SoCamera::nearDistance

Distance from camera position to the near clipping plane in the camera's view volume.

Default value is 1.0. Value must be larger than 0.0, or it will not be possible to construct a valid viewing volume (for perspective rendering, at least).

If you use one of the viewer components from the So[Xt|Qt|Win|Gtk] GUI libraries provided Kongsberg Oil & Gas Technologies, they will automatically update this value for the scene camera according to the scene bounding box. Ditto for the far clipping plane.

See also: SoCamera::farDistance

SoSFFloat SoCamera::farDistance

Distance from camera position to the far clipping plane in the camera's view volume.

Default value is 10.0. Must be larger than the SoCamera::nearDistance value, or it will not be possible to construct a valid viewing volume.

Note that the range [nearDistance, farDistance] decides the dynamic range of the Z-buffer in the underlying polygon-rendering rasterizer. What this means is that if the near and far clipping planes of the camera are wide apart, the possibility of visual artifacts will increase. The artifacts will manifest themselves in the form of flickering of primitives close in depth.

It is therefore a good idea to keep the near and far clipping planes of your camera(s) as closely fitted around the geometry of the scene graph as possible.

See also: SoCamera::nearDistance, SoPolygonOffset

SoSFFloat SoCamera::focalDistance

Distance from camera position to center of scene.

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

SoCamera.h
SoCamera.cpp

Public Types

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Static Protected Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation