mOrientedBox.cpp

Detailed Description

 1
 2//-----------------------------------------------------------------------------
 3// Copyright (c) 2012 GarageGames, LLC
 4//
 5// Permission is hereby granted, free of charge, to any person obtaining a copy
 6// of this software and associated documentation files (the "Software"), to
 7// deal in the Software without restriction, including without limitation the
 8// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 9// sell copies of the Software, and to permit persons to whom the Software is
10// furnished to do so, subject to the following conditions:
11//
12// The above copyright notice and this permission notice shall be included in
13// all copies or substantial portions of the Software.
14//
15// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21// IN THE SOFTWARE.
22//-----------------------------------------------------------------------------
23
24#include "platform/platform.h"
25#include "math/mOrientedBox.h"
26
27#include "math/mMatrix.h"
28
29
30
31//-----------------------------------------------------------------------------
32
33bool OrientedBox3F::isContained( const Point3F& point ) const
34{
35   Point3F distToCenter = point - getCenter();
36   for( U32 i = 0; i < 3; ++ i )
37   {
38      F32 coeff = mDot( distToCenter, getAxis( i ) );
39      if( mFabs( coeff ) > getHalfExtents()[ i ] )
40         return false;
41   }
42
43   return true;
44}
45
46//-----------------------------------------------------------------------------
47
48void OrientedBox3F::set( const MatrixF& transform, const Point3F& extents )
49{
50   mCenter = transform.getPosition();
51
52   mAxes[ RightVector ] = transform.getRightVector();
53   mAxes[ ForwardVector ] = transform.getForwardVector();
54   mAxes[ UpVector ] = transform.getUpVector();
55
56   mHalfExtents = extents * 0.5f;
57
58   _initPoints();
59}
60
61//-----------------------------------------------------------------------------
62
63void OrientedBox3F::set( const MatrixF& transform, const Box3F& aabb )
64{
65   mCenter = aabb.getCenter();
66   transform.mulP( mCenter );
67
68   mAxes[ RightVector ] = transform.getRightVector();
69   mAxes[ ForwardVector ] = transform.getForwardVector();
70   mAxes[ UpVector ] = transform.getUpVector();
71
72   mHalfExtents[ 0 ] = aabb.len_x() / 2.f;
73   mHalfExtents[ 1 ] = aabb.len_y() / 2.f;
74   mHalfExtents[ 2 ] = aabb.len_z() / 2.f;
75
76   _initPoints();
77}
78
79//-----------------------------------------------------------------------------
80
81void OrientedBox3F::_initPoints()
82{
83   const Point3F right = mAxes[ RightVector ] * mHalfExtents.x;
84   const Point3F forward = mAxes[ ForwardVector ] * mHalfExtents.y;
85   const Point3F up = mAxes[ UpVector ] * mHalfExtents.z;
86
87   mPoints[ NearBottomLeft ] = mCenter - forward - right - up;
88   mPoints[ NearBottomRight ] = mCenter - forward + right - up;
89   mPoints[ NearTopLeft ] = mCenter - forward - right + up;
90   mPoints[ NearTopRight ] = mCenter - forward + right + up;
91
92   mPoints[ FarBottomLeft ] = mCenter + forward - right - up;
93   mPoints[ FarBottomRight ] = mCenter + forward + right - up;
94   mPoints[ FarTopLeft ] = mCenter + forward - right + up;
95   mPoints[ FarTopRight ] = mCenter + forward + right + up;
96}
97