Scene looks dark and noisy

[silentstranger5]

I'm following along the first book in C. I'm trying to render a scene with a hollow glass sphere with an air bubble inside. When I compare this scene to the picture in the book, I notice that the whole scene looks dark and noisy.

Here is how the scene looks like:

Here is my code:

rays.zip

[silentstranger5]

Scene looks better now. The issue was in maximum recursion depth. I did not notice that it changed to 50. It takes more time to render the scene now, but glass sphere does not look dark anymore.

[hollasch]

Thanks for following up!

[silentstranger5]

I also figured out how to make scene a lot smoother and better lit. I did not notice that the sample count changed to 100. It increases rendering time yet again at the cost of better looking scene.