SoDirectionalLight - Online Linux Manual PageSection : 3
Updated : Mon Jan 25 2021
Source : Version 3.1.3
Note : Coin

NAMESoDirectionalLight − The SoDirectionalLight class is a node type for specifying directional light sources​.

SYNOPSIS
#include <Inventor/nodes/SoDirectionalLight​.h> Inherits SoLight​. Inherited by SoDirectionalLightManip​.

Public Member Functionsvirtual SoType getTypeId (void) const
SoDirectionalLight (void)
virtual void GLRender (SoGLRenderAction *action)

Static Public Member Functionsstatic SoType getClassTypeId (void)
static void initClass (void)

Public AttributesSoSFVec3f direction

Protected Member Functionsvirtual const SoFieldData * getFieldData (void) const
virtual ~SoDirectionalLight ()

Static Protected Member Functionsstatic const SoFieldData ** getFieldDataPtr (void)

Additional Inherited Members

Detailed DescriptionThe SoDirectionalLight class is a node type for specifying directional light sources​. A directional light source provides a model of light sources which are at infinite distance from the geometry it illuminates, thereby having no set position and consisting of an infinite volume of parallel rays​. This is of course a simplified model of far-away light sources, as 'infinite distance' is impossible​. The sun shining on objects on earth is a good example of something which can be modeled rather well for the most common purposes with a directional light source​. See also documentation of parent class for important information regarding light sources in general​. FILE FORMAT/DEFAULTS: DirectionalLight { on TRUE intensity 1 color 1 1 1 direction 0 0 -1 } A common thing to do with an SoDirectionalLight is to connect it to a camera, so it works in the style of a head light to that camera​. This can easily be accomplished by linking an SoRotation::rotation field, influencing the light, to the SoCamera::orientation field​. Here is a complete example iv-file demonstrating the technique: #Inventor V2.1 ascii DEF mycam PerspectiveCamera { } TransformSeparator { SoRotation { rotation = USE mycam.orientation } DirectionalLight { direction 0 0 -1 } } Cube { }(The SoTransformSeparator is included to keep the effect of the SoRotation node within a scope where it will only influence the light, and not the geometry following the light in the scene graph​.)

Constructor & Destructor Documentation

SoDirectionalLight::SoDirectionalLight (void)Constructor​.

SoDirectionalLight::~SoDirectionalLight () [protected], [virtual]Destructor​.

Member Function Documentation

SoType SoDirectionalLight::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 SoLight​. Reimplemented in SoDirectionalLightManip​.

const SoFieldData * SoDirectionalLight::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 SoLight​. Reimplemented in SoDirectionalLightManip​.

void SoDirectionalLight::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​. Reimplemented in SoDirectionalLightManip​.

Member Data Documentation

SoSFVec3f SoDirectionalLight::directionThe direction of the light source​. Defaults to pointing along the negative z-axis​.

AuthorGenerated automatically by Doxygen for Coin from the source code​.
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Johanes Gumabo
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