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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 FunctionNoise
*/
#ifndef _functions_noise_h_
#define _functions_noise_h_
#include "common.h"
#include "function_boilerplate.h"
#include "noise.h"
//------------------------------------------------------------------------------------------
//! Perlin noise function.
/*! Returns a single value replicated into all three channels
*/
FUNCTION_BEGIN(FunctionNoiseOneChannel,0,0,false,0)
//! Evaluate function.
virtual const XYZ evaluate(const XYZ& p) const
{
// Crank up the frequency a bit otherwise don't see much variation in base case
const real v=_noise(2.0*p);
return XYZ(v,v,v);
}
protected:
static Noise _noise;
FUNCTION_END(FunctionNoiseOneChannel)
//------------------------------------------------------------------------------------------
//! Multiscale noise function.
/*! Returns a single value replicated into all three channels
*/
FUNCTION_BEGIN(FunctionMultiscaleNoiseOneChannel,0,0,false,0)
//! Evaluate function.
virtual const XYZ evaluate(const XYZ& p) const
{
real t=0.0;
real tm=0.0;
for (uint i=0;i<8;i++)
{
const real k=(1<<i);
const real ik=1.0/k;
t+=ik*_noise(k*p);
tm+=ik;
}
const real v=t/tm;
return XYZ(v,v,v);
}
protected:
static Noise _noise;
FUNCTION_END(FunctionMultiscaleNoiseOneChannel)
//------------------------------------------------------------------------------------------
//! Perlin noise function.
/*! Returns three independent channels
*/
FUNCTION_BEGIN(FunctionNoiseThreeChannel,0,0,false,0)
//! Evaluate function.
virtual const XYZ evaluate(const XYZ& p) const
{
return XYZ(_noise0(p),_noise1(p),_noise2(p));
}
protected:
static Noise _noise0;
static Noise _noise1;
static Noise _noise2;
FUNCTION_END(FunctionNoiseThreeChannel)
//------------------------------------------------------------------------------------------
//! Perlin multiscale noise function.
/*! Returns three independent channels
*/
FUNCTION_BEGIN(FunctionMultiscaleNoiseThreeChannel,0,0,false,0)
//! Evaluate function.
virtual const XYZ evaluate(const XYZ& p) const
{
XYZ t(0.0,0.0,0.0);
real tm=0.0;
for (uint i=0;i<8;i++)
{
const real k=(1<<i);
const real ik=1.0/k;
const XYZ kp(k*p);
t+=ik*XYZ(_noise0(kp),_noise1(kp),_noise2(kp));
tm+=ik;
}
return t/tm;
}
protected:
static Noise _noise0;
static Noise _noise1;
static Noise _noise2;
FUNCTION_END(FunctionMultiscaleNoiseThreeChannel)
#endif
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