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/**************************************************************************/
/* Copyright 2012 Tim Day */
/* */
/* This file is part of Evolvotron */
/* */
/* Evolvotron is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation, either version 3 of the License, or */
/* (at your option) any later version. */
/* */
/* Evolvotron is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with Evolvotron. If not, see <http://www.gnu.org/licenses/>. */
/**************************************************************************/
/*! \file
\brief Interfaces and implementation for specific Function classes.
As much as possible of the implementation should be pushed into the FunctionBoilerplate template.
*/
#ifndef _functions_geometry_h_
#define _functions_geometry_h_
#include "useful.h"
#include "function_boilerplate.h"
//------------------------------------------------------------------------------------------
FUNCTION_BEGIN(FunctionCross,0,2,false,0)
//! Evaluate function.
virtual const XYZ evaluate(const XYZ& p) const
{
const XYZ v0(arg(0)(p));
const XYZ v1(arg(1)(p));
return v0*v1;
}
FUNCTION_END(FunctionCross)
//------------------------------------------------------------------------------------------
//! Invert the leaf function using a radius-one origin centred sphere.
FUNCTION_BEGIN(FunctionGeometricInversion,0,1,false,0)
//! Evaluate function.
virtual const XYZ evaluate(const XYZ& p) const
{
const real radius2=p.magnitude2();
const XYZ ip(p/radius2);
return arg(0)(ip);
}
FUNCTION_END(FunctionGeometricInversion)
//------------------------------------------------------------------------------------------
//! Implements reflection of sampling point about a plane
FUNCTION_BEGIN(FunctionReflect,0,3,false,0)
//! Evaluate function.
virtual const XYZ evaluate(const XYZ& p) const
{
const XYZ pt_in_plane(arg(0)(p));
const XYZ normal(arg(1)(p).normalised());
XYZ pos(arg(2)(p));
const real distance_from_plane=(pos-pt_in_plane)%normal;
// If pos is on the wrong side of the plane, reflect it over
// Check: normal (0,0,1), pos (0,0,-1) => distance -1, pos-=(2*-1)*(0,0,1) => pos-=(0,0,-2)
if (distance_from_plane<0.0)
{
pos-=(2.0*distance_from_plane)*normal;
}
return pos;
}
FUNCTION_END(FunctionReflect)
//------------------------------------------------------------------------------------------
#endif
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