source: OGRE/trunk/ogrenew/OgreMain/src/OgrePlane.cpp @ 692

Revision 692, 4.0 KB checked in by mattausch, 19 years ago (diff)

adding ogre 1.2 and dependencies

Line 
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) 2000-2005 The OGRE Team
8Also see acknowledgements in Readme.html
9
10This program is free software; you can redistribute it and/or modify it under
11the terms of the GNU Lesser General Public License as published by the Free Software
12Foundation; either version 2 of the License, or (at your option) any later
13version.
14
15This program is distributed in the hope that it will be useful, but WITHOUT
16ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19You should have received a copy of the GNU Lesser General Public License along with
20this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22http://www.gnu.org/copyleft/lesser.txt.
23-----------------------------------------------------------------------------
24*/
25#include "OgreStableHeaders.h"
26#include "OgrePlane.h"
27#include "OgreMatrix3.h"
28
29namespace Ogre {
30    //-----------------------------------------------------------------------
31    Plane::Plane ()
32    {
33        normal = Vector3::ZERO;
34        d = 0.0;
35    }
36    //-----------------------------------------------------------------------
37    Plane::Plane (const Plane& rhs)
38    {
39        normal = rhs.normal;
40        d = rhs.d;
41    }
42    //-----------------------------------------------------------------------
43    Plane::Plane (const Vector3& rkNormal, Real fConstant)
44    {
45        normal = rkNormal;
46        d = -fConstant;
47    }
48    //-----------------------------------------------------------------------
49    Plane::Plane (const Vector3& rkNormal, const Vector3& rkPoint)
50    {
51        normal = rkNormal;
52        d = -rkNormal.dotProduct(rkPoint);
53    }
54    //-----------------------------------------------------------------------
55    Plane::Plane (const Vector3& rkPoint0, const Vector3& rkPoint1,
56        const Vector3& rkPoint2)
57    {
58        redefine(rkPoint0, rkPoint1, rkPoint2);
59    }
60    //-----------------------------------------------------------------------
61    Real Plane::getDistance (const Vector3& rkPoint) const
62    {
63        return normal.dotProduct(rkPoint) + d;
64    }
65    //-----------------------------------------------------------------------
66    Plane::Side Plane::getSide (const Vector3& rkPoint) const
67    {
68        Real fDistance = getDistance(rkPoint);
69
70        if ( fDistance < 0.0 )
71            return Plane::NEGATIVE_SIDE;
72
73        if ( fDistance > 0.0 )
74            return Plane::POSITIVE_SIDE;
75
76        return Plane::NO_SIDE;
77    }
78    //-----------------------------------------------------------------------
79    void Plane::redefine(const Vector3& rkPoint0, const Vector3& rkPoint1,
80        const Vector3& rkPoint2)
81    {
82        Vector3 kEdge1 = rkPoint1 - rkPoint0;
83        Vector3 kEdge2 = rkPoint2 - rkPoint0;
84        normal = kEdge1.crossProduct(kEdge2);
85        normal.normalise();
86        d = -normal.dotProduct(rkPoint0);
87    }
88        //-----------------------------------------------------------------------
89        Vector3 Plane::projectVector(const Vector3& p)
90        {
91                // We know plane normal is unit length, so use simple method
92                Matrix3 xform;
93                xform[0][0] = normal.x * normal.x - 1.0f;
94                xform[0][1] = normal.x * normal.y;
95                xform[0][2] = normal.x * normal.z;
96                xform[1][0] = normal.y * normal.x;
97                xform[1][1] = normal.y * normal.y - 1.0f;
98                xform[1][2] = normal.y * normal.z;
99                xform[2][0] = normal.z * normal.x;
100                xform[2][1] = normal.z * normal.y;
101                xform[2][2] = normal.z * normal.z - 1.0f;
102                return xform * p;
103
104        }
105    //-----------------------------------------------------------------------
106    std::ostream& operator<< (std::ostream& o, Plane& p)
107    {
108        o << "Plane(normal=" << p.normal << ", d=" << p.d << ")";
109        return o;
110    }
111} // namespace Ogre
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