143 lines
3.7 KiB
C++
143 lines
3.7 KiB
C++
/****************************************************************************
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Copyright (c) 2011-2013,WebJet Business Division,CYOU
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http://www.genesis-3d.com.cn
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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****************************************************************************/
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#ifndef __ray_H__
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#define __ray_H__
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#include "math/float3.h"
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#include "math/matrix44.h"
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namespace Math
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{
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class Ray
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{
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public:
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Ray();
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Ray(const float3& origin, const float3& normalizeDir);
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const float3& Start() const;
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void Start(const float3& startPoint);
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const float3& Direction() const;
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void DirectionNormalize( const float3& normalizeDir );
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float3 PointAt(scalar t) const;
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float SqrDistance(const float3 &q) const;
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Ray Tramsform(const matrix44& m) const;
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protected:
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float3 mOrigin;
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float3 mDir;
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};
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//------------------------------------------------------------------------
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inline
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Ray::Ray()
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{
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}
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//------------------------------------------------------------------------
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inline
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Ray::Ray( const float3& origin, const float3& normalizeDir )
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{
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n_assert( float3::isNormalize(normalizeDir) );
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mOrigin = origin;
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mDir = normalizeDir;
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}
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//------------------------------------------------------------------------
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inline
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const float3&
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Ray::Start() const
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{
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return mOrigin;
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}
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//------------------------------------------------------------------------
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inline
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void
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Ray::Start(const float3& startPoint)
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{
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mOrigin = startPoint;
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}
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//------------------------------------------------------------------------
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inline
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const float3&
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Ray::Direction() const
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{
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return mDir;
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}
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//------------------------------------------------------------------------
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inline
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void
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Ray::DirectionNormalize( const float3& normalizeDir )
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{
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n_assert( float3::isNormalize(normalizeDir) );
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mDir = normalizeDir;
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}
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//------------------------------------------------------------------------
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inline
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float3
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Ray::PointAt(scalar t) const
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{
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return mOrigin + t * mDir;
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}
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//------------------------------------------------------------------------
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// <Geometric Tools for computer Graphics> P265
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inline
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float
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Ray::SqrDistance (const float3 & q) const
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{
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float3 vectorSubtract = q - mOrigin;
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float t1 = mDir.dotProduct(vectorSubtract);
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float t2 = mDir.dotProduct(mDir);
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n_assert( t2 != 0.0f );
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float t = t1 / t2;
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float3 qPrime = PointAt (t);
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float3 pLength = q - qPrime;
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return pLength.lengthsq();
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}
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//------------------------------------------------------------------------
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inline
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Ray Ray::Tramsform(const matrix44& m) const
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{
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float3 origin = mOrigin.transformPoint(m);
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float3 normalizeDir = mDir.transformVector(m);
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normalizeDir.normalise();
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return Ray(origin,normalizeDir);
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}
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}
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#endif // __ray_H__
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