I'm trying to create procedural textures, and for that, I'm generating noise, and then writing that data to an image file, to be displayed. So far I generated the noise, and now I'm trying to write that to an image file, to display the noise. And my problem is nothing is being drawn, the image file looks like this

When I expected my image to look something like this image below

https://i.sstatic.net/X95qE.jpg

Here's my code where I'm writing to the image file

 void write_noise_2d(int w, int h, int channels_num) { // initialize noise fnl_state noise = fnlCreateState(); noise.noise_type = FNL_NOISE_OPENSIMPLEX2; // create data array for noise uint8_t* noise_data = malloc(w * h * channels_num * sizeof(uint8_t)); int index = 0; // create noise throughout the entire image for(int x=0; x<w; x++) { for(int y=0; y<h; y++) { noise_data[index++] = fnlGetNoise2D(&noise, x, y); } } stbi_write_jpg("textures/noisemap.jpg", w, h, channels_num, noise_data, w * channels_num); free(noise_data); } write_noise_2d(512, 512, 3); 

I did diligent research on this topic and even found some example source code, that worked when I just copied and pasted it, but when I implemented the noise functions, it no longer worked. Instead of displaying the noise data like I expected it to (as shown in the example image provided). Instead, it's nothing more than just a black square.

EDIT: For reference, this is the main resource I was using for this. Copying and pasting this code actually displays the data on the file, while my implementation doesn't.

http://chanhaeng.blogspot.com/2018/12/how-to-use-stbimagewrite.html

I'm trying to create procedural textures, and for that, I'm generating noise, and then writing that data to an image file, to be displayed. So far I generated the noise, and now I'm trying to write that to an image file, to display the noise. I expect my image to look like this, but instead it is entirely black.

Here's my code where I'm writing to the image file

 void write_noise_2d(int w, int h, int channels_num) { // initialize noise fnl_state noise = fnlCreateState(); noise.noise_type = FNL_NOISE_OPENSIMPLEX2; // create data array for noise uint8_t* noise_data = malloc(w * h * channels_num * sizeof(uint8_t)); int index = 0; // create noise throughout the entire image for(int x=0; x<w; x++) { for(int y=0; y<h; y++) { noise_data[index++] = fnlGetNoise2D(&noise, x, y); } } stbi_write_jpg("textures/noisemap.jpg", w, h, channels_num, noise_data, w * channels_num); free(noise_data); } write_noise_2d(512, 512, 3); 

I did diligent research on this topic and even found some example source code, that worked when I just copied and pasted it, but when I implemented the noise functions, it no longer worked. Instead of displaying the noise data like I expected it to (as shown in the example image provided). Instead, it's nothing more than just a black square.

EDIT: For reference, this is the main resource I was using for this. Copying and pasting this code actually displays the data on the file, while my implementation doesn't.

http://chanhaeng.blogspot.com/2018/12/how-to-use-stbimagewrite.html

I'm trying to create procedural textures, and for that, I'm generating noise, and then writing that data to an image file, to be displayed. So far I generated the noise, and now I'm trying to write that to an image file, to display the noise. And my problem is nothing is being drawn, the image file looks like this

When I expected my image to look something like this image below

https://i.sstatic.net/X95qE.jpg

Here's my code where I'm writing to the image file

 void write_noise_2d(int w, int h, int channels_num) { // initialize noise fnl_state noise = fnlCreateState(); noise.noise_type = FNL_NOISE_OPENSIMPLEX2; // create data array for noise uint8_t* noise_data = malloc(w * h * channels_num * sizeof(uint8_t)); int index = 0; // create noise throughout the entire image for(int x=0; x<w; x++) { for(int y=0; y<h; y++) { noise_data[index++] = fnlGetNoise2D(&noise, x, y); } } stbi_write_jpg("textures/noisemap.jpg", w, h, channels_num, noise_data, w * channels_num); free(noise_data); } write_noise_2d(512, 512, 3); 

I did diligent research on this topic and even found some example source code, that worked when I just copied and pasted it, but when I implemented the noise functions, it no longer worked. Instead of displaying the noise data like I expected it to (as shown in the example image provided). Instead, it's nothing more than just a black square.

I'm trying to create procedural textures, and for that, I'm generating noise, and then writing that data to an image file, to be displayed. So far I generated the noise, and now I'm trying to write that to an image file, to display the noise. And my problem is nothing is being drawn, the image file looks like this

When I expected my image to look something like this image below

https://i.sstatic.net/X95qE.jpg

Here's my code where I'm writing to the image file

 void write_noise_2d(int w, int h, int channels_num) { // initialize noise fnl_state noise = fnlCreateState(); noise.noise_type = FNL_NOISE_OPENSIMPLEX2; // create data array for noise uint8_t* noise_data = malloc(w * h * channels_num * sizeof(uint8_t)); int index = 0; // create noise throughout the entire image for(int x=0; x<w; x++) { for(int y=0; y<h; y++) { noise_data[index++] = fnlGetNoise2D(&noise, x, y); } } stbi_write_jpg("textures/noisemap.jpg", w, h, channels_num, noise_data, w * channels_num); free(noise_data); } write_noise_2d(512, 512, 3); 

I did diligent research on this topic and even found some example source code, that worked when I just copied and pasted it, but when I implemented the noise functions, it no longer worked. Instead of displaying the noise data like I expected it to (as shown in the example image provided). Instead, it's nothing more than just a black square.

EDIT: For reference, this is the main resource I was using for this. Copying and pasting this code actually displays the data on the file, while my implementation doesn't.

http://chanhaeng.blogspot.com/2018/12/how-to-use-stbimagewrite.html