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mountain terrain with multiple octaves of noise

pull/6/head
EmaMaker 2023-07-23 12:36:28 +02:00
parent 4fa89fd2f5
commit 9bc5bab3b2
1 changed files with 23 additions and 9 deletions
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32
src/chunkgenerator.cpp
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@ -8,10 +8,10 @@
#include "OpenSimplexNoise.h" #include "OpenSimplexNoise.h"
#include "utils.hpp" #include "utils.hpp"
#define GRASS_OFFSET 40 #define GRASS_OFFSET 100
#define NOISE_GRASS_MULT 20 #define NOISE_GRASS_MULT 50
#define NOISE_DIRT_MULT 3 #define NOISE_DIRT_MULT 3
#define NOISE_DIRT_MIN 2 #define NOISE_DIRT_MIN 3
#define NOISE_DIRT_X_MULT 0.001f #define NOISE_DIRT_X_MULT 0.001f
#define NOISE_DIRT_Z_MULT 0.001f #define NOISE_DIRT_Z_MULT 0.001f
#define NOISE_GRASS_X_MULT 0.018f #define NOISE_GRASS_X_MULT 0.018f
@ -36,6 +36,19 @@ OpenSimplexNoise::Noise noiseGen2(mt());
std::array<int, CHUNK_SIZE * CHUNK_SIZE> grassNoiseLUT; std::array<int, CHUNK_SIZE * CHUNK_SIZE> grassNoiseLUT;
std::array<int, CHUNK_SIZE * CHUNK_SIZE> dirtNoiseLUT; std::array<int, CHUNK_SIZE * CHUNK_SIZE> dirtNoiseLUT;
double evaluateNoise(OpenSimplexNoise::Noise noiseGen, double x, double y, double amplitude, double
frequency, double persistence, double lacunarity, int octaves){
double sum = 0;
for(int i = 0; i < octaves; i++){
sum += amplitude * noiseGen.eval(x*frequency, y*frequency);
amplitude *= persistence;
frequency *= lacunarity;
}
return sum;
}
void generateNoise(Chunk::Chunk *chunk) void generateNoise(Chunk::Chunk *chunk)
{ {
for (int i = 0; i < grassNoiseLUT.size(); i++) for (int i = 0; i < grassNoiseLUT.size(); i++)
@ -56,13 +69,14 @@ void generateNoise(Chunk::Chunk *chunk)
int z = HILBERT_XYZ_DECODE[s][2] + CHUNK_SIZE * chunk->getPosition().z; int z = HILBERT_XYZ_DECODE[s][2] + CHUNK_SIZE * chunk->getPosition().z;
int d2 = HILBERT_XYZ_DECODE[s][0] * CHUNK_SIZE + HILBERT_XYZ_DECODE[s][2]; int d2 = HILBERT_XYZ_DECODE[s][0] * CHUNK_SIZE + HILBERT_XYZ_DECODE[s][2];
if (grassNoiseLUT[d2] == -1){ if (grassNoiseLUT[d2] == -1)
grassNoiseLUT[d2] = GRASS_OFFSET + (int)((0.5 + noiseGen1.eval(x * NOISE_GRASS_X_MULT, z * NOISE_GRASS_Z_MULT) * NOISE_GRASS_MULT)); grassNoiseLUT[d2] = GRASS_OFFSET + evaluateNoise(noiseGen1, x, z, NOISE_GRASS_MULT,
} 0.01, 0.35, 2.1, 5);
if (dirtNoiseLUT[d2] == -1){ if (dirtNoiseLUT[d2] == -1)
dirtNoiseLUT[d2] = NOISE_DIRT_MIN + (int)((0.5 + noiseGen2.eval(x * NOISE_DIRT_X_MULT, z * NOISE_DIRT_Z_MULT) * NOISE_DIRT_MULT)); dirtNoiseLUT[d2] = NOISE_DIRT_MIN + (int)((1 + noiseGen2.eval(x
} * NOISE_DIRT_X_MULT, z * NOISE_DIRT_Z_MULT)) * NOISE_DIRT_MULT);
int grassNoise = grassNoiseLUT[d2]; int grassNoise = grassNoiseLUT[d2];
int dirtNoise = dirtNoiseLUT[d2]; int dirtNoise = dirtNoiseLUT[d2];
int stoneLevel = grassNoise - dirtNoise; int stoneLevel = grassNoise - dirtNoise;