Track::OcclusionTester Class Reference

Tests if an object can be seen. More...

#include <OcclusionTester.h>

List of all members.

Public Types
	VS_OUT = 0
	completely outside of view area (don't draw)
	VS_IN = 1
	completey inside view area (draw, including all sub volumes)
	VS_PARTIAL = 2
	partially inside view area (draw, but you could test sub volumes individually.)
enum	ViewState { VS_OUT = 0, VS_IN = 1, VS_PARTIAL = 2 }
	Value returned by an. More...
Public Member Functions
	OcclusionTester ()
virtual	~OcclusionTester ()
ViewState	operator() (const AxisAlignedBoundingBox &aabb) const
	Test if an axis aligned bounding box is in view.
Public Attributes
btVector3	plane_vectors [5]
	Plane normal vectors.
btScalar	plane_distances [5]
	Plane distances from the origin.
Protected Member Functions
bool	in_half_space (const btVector3 &point, const unsigned plane_index) const
	test if a point is in a half space defined by a plane equation.

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Detailed Description

Tests if an object can be seen.

It knows the camera angle it is being tested against. The camera's view frustum is passed to this class as 5 planes: we ignore the back plane. Objects may use OcclusionTester to test if a bounding volume is in view.

Definition at line 27 of file OcclusionTester.h.

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Member Enumeration Documentation

enum Track::OcclusionTester::ViewState

Value returned by an.

Enumerator:

VS_OUT	completely outside of view area (don't draw)
VS_IN	completey inside view area (draw, including all sub volumes)
VS_PARTIAL	partially inside view area (draw, but you could test sub volumes individually.)

Definition at line 31 of file OcclusionTester.h.

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Constructor & Destructor Documentation

Track::OcclusionTester::OcclusionTester

(

)

Definition at line 17 of file OcclusionTester.cpp.

Track::OcclusionTester::~OcclusionTester

(

)

[virtual]

Definition at line 21 of file OcclusionTester.cpp.

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Member Function Documentation

bool Track::OcclusionTester::in_half_space	(	const btVector3 &	point,
		const unsigned	plane_index
	)			const [inline, protected]

test if a point is in a half space defined by a plane equation.

Definition at line 73 of file OcclusionTester.cpp.

OcclusionTester::ViewState Track::OcclusionTester::operator()

(

const AxisAlignedBoundingBox &

aabb

)

const

Test if an axis aligned bounding box is in view.

Todo:

more testing. It could be outside still, if partially inside two half spaces.

Definition at line 25 of file OcclusionTester.cpp.

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Member Data Documentation

btScalar Track::OcclusionTester::plane_distances[5]

Plane distances from the origin.

Definition at line 45 of file OcclusionTester.h.

btVector3 Track::OcclusionTester::plane_vectors[5]

Plane normal vectors.

A point p is in view if p dot plane_vector[i] < plane_distance[i] for all planes i.

Definition at line 42 of file OcclusionTester.h.

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

• libtrack/OcclusionTester.h
• libtrack/OcclusionTester.cpp

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Generated at Mon Sep 6 00:41:18 2010 by Doxygen version 1.4.7 for Racer version svn335.