Question

I want to store the byte value of aFloat in pixelsArray for each 3D coordinate, in a 1D array:

float aFloat = 1.0;
unsigned char* pixelsArray = new unsigned char[HEIGHT*WIDTH*3];

for (int i = 0; i < HEIGHT; i++)
{
   for (int j = 0; j < WIDTH; j++)
   {
      for (int k = 0; k < 3; k++)
      {
         pixelsArray[?] = aFloat;
      }
   }
}

What would go in the ?? I think it also needs to have + sizeof(float) somewhere in the index if I’m not mistaken.

Answer 1

Your inside line needs to be:

pixelsArray[(i * WIDTH + j) * 3 + k] = (unsigned char)(255.0 * aFloat);

This should give you an all-white image.

Make sure your target is really three bytes per pixel and not four (alpha channel or padding); if it is four, you’ll just need to change the 3 above to a 4.