Usage
Ray casting can refer to:
- the general problem of determining the first object intersected by a ray,
- a technique for hidden surface removal based on finding the first intersection of a ray cast from the eye through each pixel of an image,
- a non-recursive variant of ray tracing that only casts primary rays, or
- a direct volume rendering method, also called volume ray casting.
Although "ray casting" and "ray tracing" were often used interchangeably in early computer graphics literature, more recent usage tries to distinguish the two. The distinction is merely that ray casting never recursively traces secondary rays, whereas ray tracing may.
Read more about this topic: Ray Casting
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