2015-12-08 07:31:57 +00:00
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/*
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* This program source code file is part of KiCad, a free EDA CAD application.
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*
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* Copyright (C) 2015 Mario Luzeiro <mrluzeiro@ua.pt>
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* Copyright (C) 1992-2015 KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you may find one here:
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* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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* or you may search the http://www.gnu.org website for the version 2 license,
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* or you may write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/**
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* @file 3d_math.h
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* @brief Defines math related functions
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*/
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#ifndef _3D_MATH_H
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#define _3D_MATH_H
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2015-12-09 07:30:48 +00:00
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#include "plugins/3dapi/xv3d_types.h"
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2015-12-08 07:31:57 +00:00
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// https://en.wikipedia.org/wiki/Spherical_coordinate_system
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/**
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* @brief SphericalToCartesian
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* @param aInclination θ ∈ [0, π]
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* @param aAzimuth φ ∈ [0, 2π]
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* @return Cartesian cordinates
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*/
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inline SFVEC3F SphericalToCartesian( float aInclination, float aAzimuth )
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{
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float sinInc = glm::sin( aInclination );
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return SFVEC3F( sinInc * glm::cos( aAzimuth ),
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sinInc * glm::sin( aAzimuth ),
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glm::cos( aInclination ) );
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}
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// https://pathtracing.wordpress.com/2011/03/03/cosine-weighted-hemisphere/
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// !TODO: this is not correct because it is not a gaussian random
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inline SFVEC3F UniformRandomHemisphereDirection( )
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{
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SFVEC3F b( (rand()/(float)RAND_MAX) - 0.5f, (rand()/(float)RAND_MAX) - 0.5f, (rand()/(float)RAND_MAX) - 0.5f);
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return b;
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}
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// https://pathtracing.wordpress.com/2011/03/03/cosine-weighted-hemisphere/
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inline SFVEC3F CosWeightedRandomHemisphereDirection( SFVEC3F n )
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{
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const float Xi1 = (float)rand() / (float)RAND_MAX;
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const float Xi2 = (float)rand() / (float)RAND_MAX;
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const float theta = acos( sqrt( 1.0f - Xi1 ) );
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const float phi = 2.0f * glm::pi<float>() * Xi2;
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const float xs = sinf( theta ) * cosf( phi );
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const float ys = cosf( theta );
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const float zs = sinf( theta ) * sinf( phi );
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const SFVEC3F y( n.x, n.y, n.z );
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SFVEC3F h = y;
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if (fabs( h.x ) <= fabs( h.y ) && fabs( h.x ) <= fabs( h.z ) )
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h.x= 1.0f;
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else if (fabs(h.y)<=fabs(h.x) && fabs(h.y)<=fabs(h.z))
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h.y= 1.0f;
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else
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h.z= 1.0f;
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const SFVEC3F x = glm::normalize( glm::cross( h, y ) );
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const SFVEC3F z = glm::normalize( glm::cross( x, y ) );
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SFVEC3F direction = xs * x + ys * y + zs * z;
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return glm::normalize( direction );
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}
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/**
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* @brief Refract
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* Based on: https://github.com/mmp/pbrt-v3/blob/master/src/core/reflection.h
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* See also: http://www.flipcode.com/archives/Raytracing_Topics_Techniques-Part_3_Refractions_and_Beers_Law.shtml
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* @param aInVector incoming vector
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* @param aNormal normal in the intersection point
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* @param aRin_over_Rout incoming refraction index / out refraction index
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* @param aOutVector the refracted vector
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* @return true
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*/
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inline bool Refract( const SFVEC3F &aInVector, const SFVEC3F &aNormal, float aRin_over_Rout, SFVEC3F &aOutVector )
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{
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float cosThetaI = -glm::dot( aNormal, aInVector );
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float sin2ThetaI = glm::max( 0.0f, 1.0f - cosThetaI * cosThetaI );
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float sin2ThetaT = aRin_over_Rout * aRin_over_Rout * sin2ThetaI;
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// Handle total internal reflection for transmission
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if( sin2ThetaT >= 1.0f )
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return false;
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float cosThetaT = sqrtf( 1.0f - sin2ThetaT );
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aOutVector = glm::normalize( aRin_over_Rout * aInVector + ( aRin_over_Rout * cosThetaI - cosThetaT ) * aNormal );
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return true;
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}
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inline float mapf( float x, float in_min, float in_max, float out_min, float out_max)
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{
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x = glm::clamp( x, in_min, in_max );
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return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
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}
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#endif // 3D_MATH_H
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