Lens flare
As mentioned in some of the recipes of Chapter 4, Postprocessing, some of the techniques we covered copy qualities common to a camera lens instead of a human eye. Lens flare is yet another camera lens imperfection commonly seen in movies. Usually seen when a very bright light source is present (such as the Sun), lens flare shows up as a series of colorful shapes that cover the scene. As an example, the following screenshot showing the Sun close to the top-right corner and a series for lens flares spread over the screenshot's diagonal:
For this recipe we are going to generate lens flares only for the Sun. This implementation can be easily ...
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