Question

How to fill a matrix with Perlin noise values using stb_perlin_noise3 in C

Answer 1

#define STB_PERLIN_IMPLEMENTATION
#include "stb_perlin.h"

#include <stdio.h>

int main() {
    int width = 16;
    int height = 16;
    float scale = 0.1f;
    float noise[16][16] = { {0},{0} };

    for (int y = 0; y < height; ++y) {
        for (int x = 0; x < width; ++x) {
            float fx = x * scale;
            float fy = y * scale;
            noise[y][x] = stb_perlin_noise3(fx, fy, 0.0f, 0, 0, 0);
        }
    }

    // Print the noise values
    for (int y = 0; y < height; ++y) {
        for (int x = 0; x < width; ++x) {
            printf("%f ", noise[y][x]);
        }
        printf("\n");
    }

    return 0;
}



/*
run:

-0.106848 -0.099210 -0.060909 0.006331 0.081986 0.141012 0.163839 0.142079 0.079955 -0.008553 -0.106848 -0.203512 -0.282563 -0.324415 -0.316221 -0.257704
-0.234752 -0.227494 -0.191100 -0.127208 -0.055320 0.000768 0.022458 0.001782 -0.057249 -0.141350 -0.234752 -0.325374 -0.393113 -0.416444 -0.383373 -0.296336
-0.365232 -0.358784 -0.326452 -0.269693 -0.205829 -0.156002 -0.136733 -0.155101 -0.207543 -0.282256 -0.365232 -0.445166 -0.501393 -0.512088 -0.465389 -0.364156
-0.463488 -0.458230 -0.431861 -0.385570 -0.333485 -0.292848 -0.277133 -0.292114 -0.334883 -0.395816 -0.463488 -0.528931 -0.575175 -0.582051 -0.536967 -0.440464
-0.500000 -0.496148 -0.476832 -0.442922 -0.404768 -0.375000 -0.363488 -0.374462 -0.405792 -0.450428 -0.500000 -0.549144 -0.588416 -0.601076 -0.573024 -0.500000
-0.463488 -0.461042 -0.448779 -0.427250 -0.403027 -0.384128 -0.376819 -0.383786 -0.403677 -0.432016 -0.463488 -0.496958 -0.532863 -0.558986 -0.559238 -0.523024
-0.365232 -0.363976 -0.357676 -0.346615 -0.334171 -0.324462 -0.320707 -0.324287 -0.334505 -0.349064 -0.365232 -0.385894 -0.421515 -0.464484 -0.496685 -0.501076
-0.234752 -0.234306 -0.232068 -0.228140 -0.223720 -0.220272 -0.218938 -0.220210 -0.223839 -0.229009 -0.234752 -0.246959 -0.283950 -0.341725 -0.400580 -0.438416
-0.106848 -0.106782 -0.106451 -0.105871 -0.105218 -0.104708 -0.104511 -0.104699 -0.105235 -0.105999 -0.106848 -0.115203 -0.153508 -0.219663 -0.293128 -0.349144
0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 -0.007704 -0.046336 -0.114156 -0.190464 -0.250000
0.106848 0.107565 0.107618 0.106764 0.105109 0.102996 0.100883 0.099228 0.098374 0.098427 0.099144 0.092289 0.054421 -0.012863 -0.088983 -0.148716
0.234752 0.239652 0.240298 0.235126 0.224825 0.211584 0.198343 0.188042 0.182871 0.183516 0.188416 0.186454 0.152993 0.088802 0.013766 -0.047104
0.365232 0.379167 0.381791 0.368944 0.342458 0.308154 0.273850 0.247364 0.234518 0.237141 0.251076 0.259540 0.235467 0.177865 0.105137 0.041846
0.463488 0.490884 0.497558 0.475891 0.429235 0.368256 0.307277 0.260621 0.238954 0.245628 0.273024 0.296792 0.286499 0.238569 0.169229 0.102384
0.500000 0.543580 0.556560 0.527690 0.461920 0.375000 0.288080 0.222310 0.193440 0.206420 0.250000 0.291868 0.297872 0.261382 0.196048 0.125000

*/

 

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