OgreSphere.h
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1/*
2-----------------------------------------------------------------------------
3This source file is part of OGRE
4 (Object-oriented Graphics Rendering Engine)
5For the latest info, see http://www.ogre3d.org/
6
7Copyright (c) 2000-2013 Torus Knot Software Ltd
8
9Permission is hereby granted, free of charge, to any person obtaining a copy
10of this software and associated documentation files (the "Software"), to deal
11in the Software without restriction, including without limitation the rights
12to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
13copies of the Software, and to permit persons to whom the Software is
14furnished to do so, subject to the following conditions:
15
16The above copyright notice and this permission notice shall be included in
17all copies or substantial portions of the Software.
18
19THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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26-----------------------------------------------------------------------------
27*/
28#ifndef __Sphere_H_
29#define __Sphere_H_
30
31// Precompiler options
32#include "OgrePrerequisites.h"
33
34#include "OgreVector3.h"
35
36namespace Ogre {
37
38
52 {
53 protected:
56 public:
58 Sphere() : mRadius(1.0), mCenter(Vector3::ZERO) {}
64 : mRadius(radius), mCenter(center) {}
65
67 Real getRadius(void) const { return mRadius; }
68
70 void setRadius(Real radius) { mRadius = radius; }
71
73 const Vector3& getCenter(void) const { return mCenter; }
74
76 void setCenter(const Vector3& center) { mCenter = center; }
77
79 bool intersects(const Sphere& s) const
80 {
81 return (s.mCenter - mCenter).squaredLength() <=
82 Math::Sqr(s.mRadius + mRadius);
83 }
85 bool intersects(const AxisAlignedBox& box) const
86 {
87 return Math::intersects(*this, box);
88 }
90 bool intersects(const Plane& plane) const
91 {
92 return Math::intersects(*this, plane);
93 }
95 bool intersects(const Vector3& v) const
96 {
97 return ((v - mCenter).squaredLength() <= Math::Sqr(mRadius));
98 }
100 void merge(const Sphere& oth)
101 {
102 Vector3 diff = oth.getCenter() - mCenter;
103 Real lengthSq = diff.squaredLength();
104 Real radiusDiff = oth.getRadius() - mRadius;
105
106 // Early-out
107 if (Math::Sqr(radiusDiff) >= lengthSq)
108 {
109 // One fully contains the other
110 if (radiusDiff <= 0.0f)
111 return; // no change
112 else
113 {
114 mCenter = oth.getCenter();
115 mRadius = oth.getRadius();
116 return;
117 }
118 }
119
120 Real length = Math::Sqrt(lengthSq);
121 Real t = (length + radiusDiff) / (2.0f * length);
122 mCenter = mCenter + diff * t;
123 mRadius = 0.5f * (length + mRadius + oth.getRadius());
124 }
125
126
127 };
131}
132
133#endif
134
#define _OgreExport
A 3D box aligned with the x/y/z axes.
Defines a plane in 3D space.
Definition OgrePlane.h:62
Reference-counted shared pointer, used for objects where implicit destruction is required.
A sphere primitive, mostly used for bounds checking.
Definition OgreSphere.h:52
bool intersects(const Sphere &s) const
Returns whether or not this sphere intersects another sphere.
Definition OgreSphere.h:79
bool intersects(const Vector3 &v) const
Returns whether or not this sphere intersects a point.
Definition OgreSphere.h:95
Vector3 mCenter
Definition OgreSphere.h:55
Real getRadius(void) const
Returns the radius of the sphere.
Definition OgreSphere.h:67
bool intersects(const Plane &plane) const
Returns whether or not this sphere intersects a plane.
Definition OgreSphere.h:90
bool intersects(const AxisAlignedBox &box) const
Returns whether or not this sphere intersects a box.
Definition OgreSphere.h:85
Sphere()
Standard constructor - creates a unit sphere around the origin.
Definition OgreSphere.h:58
void merge(const Sphere &oth)
Merges another Sphere into the current sphere.
Definition OgreSphere.h:100
void setRadius(Real radius)
Sets the radius of the sphere.
Definition OgreSphere.h:70
Sphere(const Vector3 &center, Real radius)
Constructor allowing arbitrary spheres.
Definition OgreSphere.h:63
void setCenter(const Vector3 &center)
Sets the center point of the sphere.
Definition OgreSphere.h:76
const Vector3 & getCenter(void) const
Returns the center point of the sphere.
Definition OgreSphere.h:73
Standard 3-dimensional vector.
Definition OgreVector3.h:52

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