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Changed the doxygen control characters and clarifications

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OpenSceneGraph git repository 2018-02-19 08:39:23 +00:00 committed by GitHub
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53
include/osg/ClusterCullingCallback
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@ -19,33 +19,32 @@
namespace osg {
///
/// @class ClusterCullingCallback
/// @brief Implements cluster culling to cull back facing drawables. Derived from Drawable::CullCallback.
///
/// This culling callback is intended to be attached to a node using the setCullCallback method. If the
/// node is a drawable cull(osg::NodeVisitor*, osg::Drawable*, osg::State*) otherwise
/// operator()(Node*, NodeVisitor*) will be called during the cull traversal.
///
/// To decide whether the node (in case of a drawable) or its children (in case of any other node type) are
/// to be culled depends on four parameters:
/// - a control point,
/// - a normal specified at the control point,
/// - a deviation value representing the cosinus of an enclosed angle and
/// - a radius describing a sphere around the control point.
///
/// The node is culled if the following two conditions are fulfilled:
/// - the distance between the current eye/view point to the control point is larger or equal to radius,
/// - the cosinus of the enclosed angle between the normal and the vector from the control point to the eye/view point
/// is smaller(!) than the specified deviation value (normally this value is negative meaning that the enclosed angle
/// between the control point and the eye/view point is larger than the angle indirectly specified by the
/// deviation value).
///
/// @remark As the deviation is representing the cosinus of an enclosed angle its value should be within the
/// the interval [-1; 1]. A value of one will cull all nodes while a value of -1 will never cull a node.
/// The deviation will normally have negative values because then the enclosed angle between the normal and the
/// eye/view point is larger than 90 degrees (and therefore the eye sees the "back" from the control point).
///
/** @class ClusterCullingCallback
@brief Implements cluster culling to cull back facing subgraphs and drawables. Derived from Drawable::CullCallback and osg::NodeCallback.
This culling callback is intended to be attached to a node using the setCullCallback method. If the
node is a drawable cull(osg::NodeVisitor*, osg::Drawable*, osg::State*) otherwise
operator()(Node*, NodeVisitor*) will be called during the cull traversal.
To decide whether the node (in case of a drawable) or its children (in case of any other node type) are
to be culled depends on four parameters:
- a control point,
- a normal specified at the control point,
- a deviation value representing the cosinus of an enclosed angle and
- a radius describing a sphere around the control point.
The node is culled if the following two conditions are fulfilled:
- the distance between the current eye/view point to the control point is larger or equal to radius,
- the cosinus of the enclosed angle between the normal and the vector from the control point to the eye/view point
is smaller(!) than the specified deviation value (normally this value is negative meaning that the enclosed angle
between the control point and the eye/view point is larger than the angle indirectly specified by the
deviation value).
@remark As the deviation is representing the cosine of an enclosed angle its value should be within the
the interval [-1; 1]. A value of one will cull all nodes while a value of -1 will never cull a node.
The deviation will normally have negative values because then the enclosed angle between the normal and the
eye/view point is larger than 90 degrees (and therefore the eye sees the "back" from the control point).
*/
class OSG_EXPORT ClusterCullingCallback : public DrawableCullCallback, public NodeCallback
{
public: