93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
// Copyright (C) 2012 Rémi Bèges
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// This file is part of the "Nazara Engine".
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Core/Error.hpp>
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#include <Nazara/Noise/Config.hpp>
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#include <Nazara/Noise/Debug.hpp>
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template <typename T>
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NzPerlin3D<T>::NzPerlin3D()
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{
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int grad3Temp[][3] = {
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{1,1,0},{-1,1,0},{1,-1,0},{-1,-1,0},
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{1,0,1},{-1,0,1},{1,0,-1},{-1,0,-1},
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{0,1,1},{0,-1,1},{0,1,-1},{0,-1,-1},
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{1,1,0},{-1,1,0},{0,-1,1},{0,-1,-1}
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};
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for(int i(0) ; i < 16 ; ++i)
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for(int j(0) ; j < 3 ; ++j)
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gradient3[i][j] = grad3Temp[i][j];
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}
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template <typename T>
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T NzPerlin3D<T>::GetValue(T x, T y, T z, T resolution)
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{
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x /= resolution;
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y /= resolution;
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z /= resolution;
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x0 = this->fastfloor(x);
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y0 = this->fastfloor(y);
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z0 = this->fastfloor(z);
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ii = x0 & 255;
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jj = y0 & 255;
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kk = z0 & 255;
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gi0 = this->perm[ii + this->perm[jj + this->perm[kk]]] & 15;
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gi1 = this->perm[ii + 1 + this->perm[jj + this->perm[kk]]] & 15;
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gi2 = this->perm[ii + this->perm[jj + 1 + this->perm[kk]]] & 15;
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gi3 = this->perm[ii + 1 + this->perm[jj + 1 + this->perm[kk]]] & 15;
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gi4 = this->perm[ii + this->perm[jj + this->perm[kk + 1]]] & 15;
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gi5 = this->perm[ii + 1 + this->perm[jj + this->perm[kk + 1]]] & 15;
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gi6 = this->perm[ii + this->perm[jj + 1 + this->perm[kk + 1]]] & 15;
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gi7 = this->perm[ii + 1 + this->perm[jj + 1 + this->perm[kk + 1]]] & 15;
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temp.x = x-x0;
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temp.y = y-y0;
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temp.z = z-z0;
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Cx = temp.x * temp.x * temp.x * (temp.x * (temp.x * 6 - 15) + 10);
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Cy = temp.y * temp.y * temp.y * (temp.y * (temp.y * 6 - 15) + 10);
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Cz = temp.z * temp.z * temp.z * (temp.z * (temp.z * 6 - 15) + 10);
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s[0] = gradient3[gi0][0]*temp.x + gradient3[gi0][1]*temp.y + gradient3[gi0][2]*temp.z;
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temp.x = x-(x0+1);
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t[0] = gradient3[gi1][0]*temp.x + gradient3[gi1][1]*temp.y + gradient3[gi1][2]*temp.z;
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temp.y = y-(y0+1);
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v[0] = gradient3[gi3][0]*temp.x + gradient3[gi3][1]*temp.y + gradient3[gi3][2]*temp.z;
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temp.x = x-x0;
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u[0] = gradient3[gi2][0]*temp.x + gradient3[gi2][1]*temp.y + gradient3[gi2][2]*temp.z;
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temp.y = y-y0;
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temp.z = z-(z0+1);
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s[1] = gradient3[gi4][0]*temp.x + gradient3[gi4][1]*temp.y + gradient3[gi4][2]*temp.z;
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temp.x = x-(x0+1);
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t[1] = gradient3[gi5][0]*temp.x + gradient3[gi5][1]*temp.y + gradient3[gi5][2]*temp.z;
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temp.y = y-(y0+1);
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v[1] = gradient3[gi7][0]*temp.x + gradient3[gi7][1]*temp.y + gradient3[gi7][2]*temp.z;
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temp.x = x-x0;
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u[1] = gradient3[gi6][0]*temp.x + gradient3[gi6][1]*temp.y + gradient3[gi6][2]*temp.z;
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Li1 = s[0] + Cx*(t[0]-s[0]);
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Li2 = u[0] + Cx*(v[0]-u[0]);
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Li3 = s[1] + Cx*(t[1]-s[1]);
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Li4 = u[1] + Cx*(v[1]-u[1]);
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Li5 = Li1 + Cy*(Li2-Li1);
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Li6 = Li3 + Cy*(Li4-Li3);
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return Li5 + Cz*(Li6-Li5);
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}
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#include <Nazara/Core/DebugOff.hpp>
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