How to fill a 3D logical matrix by a series of point coordinates?

I am trying to develop an algorithm inwhich I need to demonstrate a 3D area by a logical matrix (1 inside a surface, 0 outside). I have a surface shown as a series of points which are floating point coordinates. How can I fill in a shape inside a logical 3D matrix annotated by this surface?

Answer 1

[KSSV]

Multiple ways:

1. Use inpolygon, get indices, fill the logicals.
2. Use ineqalities and get logicals straight away.

[Mohammad]

can you elucidate your answer by a few lines of code?

[Mohammad]

I have a 3d array of floating positions. How can I fill by logical operations while positions are not inside a single layer?!