private void LoadFromPPM(PPM ppm)
{
hres = ppm.Width;
vres = ppm.Height;
for (int y = 0; y < vres; y++)
{
for (int x = 0; x < hres; x++)
{
Vec3 c = ppm.GetColorv(x, y);
pixels.Add(c);
}
}
}