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Introduction to Computer Graphics by Marco Di Benedetto, Sumanta Pattanaik, Massimiliano Corsini, Fabio Ganovelli

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Chapter 8

Shadows

8.1 The Shadow Phenomenon

In Chapter 6 we learned that many types of interactions between light and matter can occur before photons leaving from emitters eventually reach our eye. We have seen that, because of the complexity of the problem, local illumination models are used in interactive applications. Then, we have seen some techniques for adding some more global lighting effects to the local model in order to improve the realism. For example, in Section 7.7.4 we used cube mapping to add reflections to the car, that is, to add one bounce of light.

In this chapter we will show how to add another global effect: the shadows. We all have the intuition of what a shadow is: a region that is darker than its surroundings because of ...

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