What is a computational geometry problem called?

Question

Algorithms

What is the name of the problem of computational geometry, in which the polygon S2 is calculated from the polygon S1 . S2 is the area of ​​the polygon that is "seen" from point O as shown in the picture. And if you tell me the algorithms for solving this problem, I will also be grateful.

Answer 1

Called field of view algorithms
roguebasin.roguelikedevelopment.org/index.php/Field_of_Vision
roguebasin.roguelikedevelopment.org/index.php/FOV_using_recursive_shadowcasting
roguebasin.roguelikedevelopment.org/index.php/Comparative_study_of_field_of_view_algorithms_for_2D_grid_based_worlds
roguebasin.roguelikedevelopment.org/index.php/Digital_field_of_view_implementation
dirkkok .wordpress.com/2008/02/17/fov-using-recursive-shadow-casting-in-c/
etc.