ShFunc.hpp File Reference

Miscellaneous small Sh utility functions. More...

#include "ShVariable.hpp"
#include "ShAttrib.hpp"
#include "ShFuncImpl.hpp"

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Namespaces
namespace	ShUtil
Functions
template<int N, typename T>
ShGeneric< N, T >	smoothstep (const ShGeneric< N, T > &a, const ShGeneric< N, T > &b, const ShGeneric< N, T > x)
	Cubic interpolated step between 0 and 1.
template<int N, typename T>
ShGeneric< N, T >	hashlcg (const ShGeneric< N, T > &p)
	Parallel linear congruential generator.
template<int N, typename T>
ShGeneric< N, T >	hashmrg (const ShGeneric< N, T > &p)
	MRG style pseudorandom vector generator.
template<typename T>
ShGeneric< 3, T >	changeBasis (const ShGeneric< 3, T > &b0, const ShGeneric< 3, T > &b1, const ShGeneric< 3, T > &b2, const ShGeneric< 3, T > &v)
	Given 3 orthonormal basis vectors b0, b1, b2, specified relative to a coordinate space C, this does a change of basis on a vector v in space C to the orthonormal basis.

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Detailed Description

Miscellaneous small Sh utility functions.

Definition in file ShFunc.hpp.

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Function Documentation

template<int N, typename T> ShGeneric< N, T > ShUtil::hashlcg (  const ShGeneric< N, T > &  p  )

Parallel linear congruential generator. This does not work very well right now. Use hashmrg instead. See also: template<int N, typename T> ShGeneric<N, T> hashmrg(const ShGeneric<N, T>& p) Definition at line 58 of file ShFuncImpl.hpp. References SH::exp(), SH::frac(), SH::mad(), and SH::pow().

template<int N, typename T> ShGeneric< N, T > ShUtil::hashmrg (  const ShGeneric< N, T > &  p  )

MRG style pseudorandom vector generator. Generates a random vector using a multiple-recursive generator style. (LCG on steroids) Treat x,y,z,w as seeds a0, a1, a2, a3 and repeatedly apply an = b * (an-1, an-2, an-3, an-4), where b is a vector Take as output (an, an-1, an-2, an3) after suitable number of iterations. This appears to reduce correlation in the output components when input components are similar, but the behaviour needs to be studied further. See also: template<int N, typename T> ShGeneric<N, T> hashlcg(const ShGeneric<N, T>& p) Definition at line 88 of file ShFuncImpl.hpp. References SH::dot(), SH::exp(), SH::frac(), and SH::pow(). Referenced by ShUtil::ShNoise< M, T, P >::cellnoise(), and ShUtil::ShNoise< M, T, P >::perlin().

template<int N, typename T> ShGeneric< N, T > ShUtil::smoothstep (  const ShGeneric< N, T > &  a, const ShGeneric< N, T > &  b, const ShGeneric< N, T >  x )

Cubic interpolated step between 0 and 1. Returns 0 if x < a, 1 if x > b, cubic interpolation between 0 and 1 otherwise Definition at line 40 of file ShFuncImpl.hpp. References SH::clamp(), and SH::mad().

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