Ray casting is a fundamental rendering technique in computer graphics that creates a 3D perspective from a 2D map, developed in the 1960s. It works by casting rays from pixels to calculate object intersections and is faster than ray tracing due to fewer computations, making it popular in early 3D video games. However, images produced by ray casting lack realism compared to those rendered with ray tracing, and not all shapes can be rendered due to geometric constraints.

1. • .
RAY CASTING METHOD IN COMPUTER
GRAPHICS
Presented by:
RASHUN KUMAR .R

2. Introduction:
 Ray casting is a rendering technique used in
computer graphics and computational geometry.
 It is capable of creating a three-dimensional
perspective in a two-dimensional map.
 Developed by scientists at the Mathematical
Applications Group in the 1960.
 it is considered one of the most basic graphics-
rendering algorithms.
 Ray casting makes use of the same geometric
algorithm as ray tracing.

3. Working:
 The main principle behind ray casting is that rays can
be cast and traced in groups based on certain
geometric constraints.
 In ray casting, a ray from the pixel through the
camera is obtained and the intersection of all objects
in the picture is computed.
 Next, the pixel value from the closest intersection is
obtained and is further set as the base for the
projection.

4.  Ray casting is distinct from ray tracing, with ray
casting being a rendering algorithm which would
never recursively trace secondary rays, while ray
tracing is capable of doing so.

5. Advantage:
Ray casting is fast, as only a single computation is
needed for every vertical line of the screen.
Compared to ray tracing, ray casting is faster, as it is
limited by one or more geometric constraints.
his is one of the reasons why ray casting was the
most popular rendering tool in early 3-D video
games.

6. Drawbacks:
• compared to ray tracing, the images generated with
ray casting are not very realistic
• Due to the geometric constraints involved in the
process, not all shapes can be rendered by ray
casting.