Talking about 3 common shadow rendering techniques in games (2): shadow cone

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Second, the shadow cone

• Principle:

  • The shadow cone uses a method called stencil buffer. As shown in the figure below, there is a triangle. When the light source illuminates the triangle, it will produce a shadow. We stretch this triangle, and a purple area will be stretched out on the front.And a blue area, these two areas are called the front area, and a brown area will be generated on the back. When these three areas are elongated, a triangular pyramid, that is, a shadow cone, will be formed.

• Implementation method:

  • The implementation formula of the shadow cone is actually (1)+(2)-(3). For the specific implementation method and more implementation details, you can pay attention to our public class, which contains the method of shadow cone rendering.

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