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NAME
SoVRMLFog -
The SoVRMLFog class is used to specify a global scene fog.
The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is
copyright The Web3D Consortium, and is used by permission of the Consortium:
SYNOPSIS
#include <Inventor/VRMLnodes/SoVRMLFog.h>
Inherits SoNode.
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.
SoVRMLFog (void)
virtual void GLRender (SoGLRenderAction *action)
Static Public Member Functions
static SoType getClassTypeId (void)
static void initClass (void)
Public Attributes
SoSFString fogType
SoSFFloat visibilityRange
SoSFColor color
Protected Member Functions
virtual const SoFieldData * getFieldData (void) const
virtual ~SoVRMLFog ()
Static Protected Member Functions
static const SoFieldData ** getFieldDataPtr (void)
Protected Attributes
SoSFBool set_bind
SoSFBool isBound
Additional Inherited Members
Detailed Description
The SoVRMLFog class is used to specify a global scene fog.
The detailed class documentation is taken verbatim from the VRML97 standard (ISO/IEC 14772-1:1997). It is
copyright The Web3D Consortium, and is used by permission of the Consortium:
Fog {
exposedField SFColor color 1 1 1 # [0,1]
exposedField SFString fogType "LINEAR"
exposedField SFFloat visibilityRange 0 # [0,inf)
eventIn SFBool set_bind
eventOut SFBool isBound
}
The Fog node provides a way to simulate atmospheric effects by blending objects with the colour specified
by the color field based on the distances of the various objects from the viewer. The distances are
calculated in the coordinate space of the Fog node. The visibilityRange specifies the distance in metres
(in the local coordinate system) at which objects are totally obscured by the fog. Objects located
outside the visibilityRange from the viewer are drawn with a constant colour of color. Objects very close
to the viewer are blended very little with the fog color.
A visibilityRange of 0.0 disables the Fog node. The visibilityRange is affected by the scaling
transformations of the Fog node's parents; translations and rotations have no affect on visibilityRange.
Values of the visibilityRange field shall be in the range [0, ).
Since Fog nodes are bindable children nodes (see 4.6.10, Bindable children nodes
http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.10), a Fog node
stack exists, in which the top- most Fog node on the stack is currently active. To push a Fog node onto
the top of the stack, a TRUE value is sent to the set_bind eventIn. Once active, the Fog node is bound to
the browser view. A FALSE value sent to set_bind, pops the Fog node from the stack and unbinds it from
the browser viewer. More details on the Fog node stack can be found in 4.6.10, Bindable children nodes
(http://www.web3d.org/x3d/specifications/vrml/ISO-IEC-14772-VRML97/part1/concepts.html#4.6.10).
The fogType field controls how much of the fog colour is blended with the object as a function of
distance. If fogType is 'LINEAR', the amount of blending is a linear function of the distance, resulting
in a depth cueing effect. If fogType is 'EXPONENTIAL,' an exponential increase in blending is used,
resulting in a more natural fog appearance. The effect of fog on lighting calculations is described in
4.14, Lighting model (http://www.web3d.org/x3d/specifications/vrml/ISO-
IEC-14772-VRML97/part1/concepts.html#4.6.14).
Constructor & Destructor Documentation
SoVRMLFog::SoVRMLFog (void)
Constructor.
SoVRMLFog::~SoVRMLFog () [protected], [virtual]
Destructor.
Member Function Documentation
SoType SoVRMLFog::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.
const SoFieldData * SoVRMLFog::getFieldData (void) const [protected], [virtual]
Returns a pointer to the class-wide field data storage object for this instance. If no fields are
present, returns NULL.
Reimplemented from SoFieldContainer.
void SoVRMLFog::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.
Member Data Documentation
SoSFString SoVRMLFog::fogType
Type of fog. Can be either 'LINEAR' or 'EXPONENTIAL'. Default value is 'LINEAR'.
SoSFFloat SoVRMLFog::visibilityRange
Range of visibility. The distance when only the fog color can be seen. Default value is (0.0).
SoSFColor SoVRMLFog::color
The fog color. Default value is (1, 1, 1).
SoSFBool SoVRMLFog::set_bind [protected]
An eventIn that is used to bind this node (make the node active).
SoSFBool SoVRMLFog::isBound [protected]
An eventOut that is sent when the node is bound/unbound.
Author
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