我试图实现一些源代码我发现
online生成高度地图使用Perlin噪声。我已经成功地设法获得高度地图，使用noise3函数，第三个坐标是随机的“种子”，以允许随机高度图。
我的问题是，生成的地形相当暗，我想要山，我正在滚动草原。我已经做了一些阅读Perlin噪声(大多是here)。由于源代码，我发现显然不是写在可读性和我的弱掌握一般的Perlin噪声的概念，我不知道我需要调整在代码(幅度和频率？)创造更为激烈的地形。
一些更多的信息生成高度地图使用Perlin噪声，Perlin噪声一般甚至一些更加可译码的代码也将受到欢迎。
编辑：我理解(kindof)如何Perlin噪声工作，例如：关于幅度和频率，我只是想知道什么变量在上面链接的代码用于这两个方面。
解决方法
Perlin噪声完全由您设置的不同变量控制，即幅度，频率和余辉。八度音量有一点变化，但不大。在我以前写的代码中，我刚刚玩了频率和持续性的数量级，直到我得到了我需要的。如果需要，我可以尝试找到我的旧源。
PerlinNoise.h
- #pragma once
- class PerlinNoise
- {
- public:
- // Constructor
- PerlinNoise();
- PerlinNoise(double _persistence,double _frequency,double _amplitude,int _octaves,int _randomseed);
- // Get Height
- double GetHeight(double x,double y) const;
- // Get
- double Persistence() const { return persistence; }
- double Frequency() const { return frequency; }
- double Amplitude() const { return amplitude; }
- int Octaves() const { return octaves; }
- int RandomSeed() const { return randomseed; }
- // Set
- void Set(double _persistence,int _randomseed);
- void SetPersistence(double _persistence) { persistence = _persistence; }
- void SetFrequency( double _frequency) { frequency = _frequency; }
- void SetAmplitude( double _amplitude) { amplitude = _amplitude; }
- void SetOctaves( int _octaves) { octaves = _octaves; }
- void SetRandomSeed( int _randomseed) { randomseed = _randomseed; }
- private:
- double Total(double i,double j) const;
- double GetValue(double x,double y) const;
- double Interpolate(double x,double y,double a) const;
- double Noise(int x,int y) const;
- double persistence,frequency,amplitude;
- int octaves,randomseed;
- };
PerlinNoise.cpp
- #include "PerlinNoise.h"
- PerlinNoise::PerlinNoise()
- {
- persistence = 0;
- frequency = 0;
- amplitude = 0;
- octaves = 0;
- randomseed = 0;
- }
- PerlinNoise::PerlinNoise(double _persistence,int _randomseed)
- {
- persistence = _persistence;
- frequency = _frequency;
- amplitude = _amplitude;
- octaves = _octaves;
- randomseed = 2 + _randomseed * _randomseed;
- }
- void PerlinNoise::Set(double _persistence,int _randomseed)
- {
- persistence = _persistence;
- frequency = _frequency;
- amplitude = _amplitude;
- octaves = _octaves;
- randomseed = 2 + _randomseed * _randomseed;
- }
- double PerlinNoise::GetHeight(double x,double y) const
- {
- return amplitude * Total(x,y);
- }
- double PerlinNoise::Total(double i,double j) const
- {
- //properties of one octave (changing each loop)
- double t = 0.0f;
- double _amplitude = 1;
- double freq = frequency;
- for(int k = 0; k < octaves; k++)
- {
- t += GetValue(j * freq + randomseed,i * freq + randomseed) * _amplitude;
- _amplitude *= persistence;
- freq *= 2;
- }
- return t;
- }
- double PerlinNoise::GetValue(double x,double y) const
- {
- int Xint = (int)x;
- int Yint = (int)y;
- double Xfrac = x - Xint;
- double Yfrac = y - Yint;
- //noise values
- double n01 = Noise(Xint-1,Yint-1);
- double n02 = Noise(Xint+1,Yint-1);
- double n03 = Noise(Xint-1,Yint+1);
- double n04 = Noise(Xint+1,Yint+1);
- double n05 = Noise(Xint-1,Yint);
- double n06 = Noise(Xint+1,Yint);
- double n07 = Noise(Xint,Yint-1);
- double n08 = Noise(Xint,Yint+1);
- double n09 = Noise(Xint,Yint);
- double n12 = Noise(Xint+2,Yint-1);
- double n14 = Noise(Xint+2,Yint+1);
- double n16 = Noise(Xint+2,Yint);
- double n23 = Noise(Xint-1,Yint+2);
- double n24 = Noise(Xint+1,Yint+2);
- double n28 = Noise(Xint,Yint+2);
- double n34 = Noise(Xint+2,Yint+2);
- //find the noise values of the four corners
- double x0y0 = 0.0625*(n01+n02+n03+n04) + 0.125*(n05+n06+n07+n08) + 0.25*(n09);
- double x1y0 = 0.0625*(n07+n12+n08+n14) + 0.125*(n09+n16+n02+n04) + 0.25*(n06);
- double x0y1 = 0.0625*(n05+n06+n23+n24) + 0.125*(n03+n04+n09+n28) + 0.25*(n08);
- double x1y1 = 0.0625*(n09+n16+n28+n34) + 0.125*(n08+n14+n06+n24) + 0.25*(n04);
- //interpolate between those values according to the x and y fractions
- double v1 = Interpolate(x0y0,x1y0,Xfrac); //interpolate in x direction (y)
- double v2 = Interpolate(x0y1,x1y1,Xfrac); //interpolate in x direction (y+1)
- double fin = Interpolate(v1,v2,Yfrac); //interpolate in y direction
- return fin;
- }
- double PerlinNoise::Interpolate(double x,double a) const
- {
- double negA = 1.0 - a;
- double negASqr = negA * negA;
- double fac1 = 3.0 * (negASqr) - 2.0 * (negASqr * negA);
- double aSqr = a * a;
- double fac2 = 3.0 * aSqr - 2.0 * (aSqr * a);
- return x * fac1 + y * fac2; //add the weighted factors
- }
- double PerlinNoise::Noise(int x,int y) const
- {
- int n = x + y * 57;
- n = (n << 13) ^ n;
- int t = (n * (n * n * 15731 + 789221) + 1376312589) & 0x7fffffff;
- return 1.0 - double(t) * 0.931322574615478515625e-9;/// 1073741824.0);
- }